Toyota Avalon Service & Repair Manual: Fail-safe Chart

FAIL-SAFE CHART

FAIL-SAFE FUNCTION

(a) When communication fails in any of the CAN bus lines (communication lines), a fail-safe function(s) will operate. The fail-safe function that is specified for each system operates to prevent those systems from malfunctioning.

(b) The following table shows the effects on each system when communication is impossible. (For further details, see the pages for each system.)

Function

Control Master

(Main ECU to determine controls)

System Related

Fail-safe Operation

Driver Detectable

DTC Detection

(ECU that stored DTC)

Regenerative Operation

  • Provides maximum amount of regeneration based on cooperative control with the Electronically Controlled Brake System.

Hybrid vehicle control ECU

Brake booster with master cylinder assembly

Normal driving

  • MIL illuminates.
  • Master warning light illuminates.

U117087

(Hybrid vehicle control ECU)

Drive Torque Control

  • Controls the engine, generator (MG1) and motor (MG2) based on engine information received.

Hybrid vehicle control ECU

ECM

Normal driving

  • MIL illuminates.
  • Master warning light illuminates.

U010087

(Hybrid vehicle control ECU)

Drive Torque Control

  • Controls the generator (MG1) and motor (MG2).

Hybrid vehicle control ECU

Inverter with converter assembly

Normal driving

Master warning light illuminates.

U011087

(Hybrid vehicle control ECU)

Drive Torque Control

  • Cruise Control.

Hybrid vehicle control ECU

Brake booster with master cylinder assembly

Normal driving

MIL illuminates.

U012987

(Hybrid vehicle control ECU)

Air Conditioning Control

  • Sends a signal from the air conditioning amplifier assembly to the hybrid vehicle control ECU and from the hybrid vehicle control ECU to the inverter for the air conditioning system.

Hybrid vehicle control ECU

Air conditioning amplifier assembly

-

-

U016487

(Hybrid vehicle control ECU)

High voltage shut off control when the vehicle is damaged.

  • Receives the SRS collision detection signal and shuts off the system main relays.

Hybrid vehicle control ECU

Airbag ECU assembly

Normal driving

Master warning light illuminates.

U015187

(Hybrid vehicle control ECU)

Motor/Generator Control

  • Controls the motor and generator by calculating the optimum voltage and current based on the requested torque value and the rotation angles of the motor and generator.
  • Inverter with converter assembly
  • Hybrid vehicle control ECU
  • ECM
  • Hybrid vehicle control ECU
  • Brake booster with master cylinder assembly

When the brake booster with master cylinder assembly is not communicating:

  • Normal driving possible (regeneration is not performed)

When an ECU other than the brake booster with master cylinder assembly is not communicating:

  • Normal driving possible
  • MIL illuminates.
  • Master warning light illuminates.

U010087

U029387

U117087

(Inverter with converter assembly)

Anti-lock Brake System Control

  • Helps prevent wheel lockup during sudden stops.

Brake booster with master cylinder assembly

Airbag ECU assembly

Control is permitted.

  • Brake warning light / yellow (minor malfunction) illuminates.
  • ABS warning light illuminates.
  • Slip indicator light illuminates.
  • Brake hold operated indicator light blinks.

U0073

U0124

(Brake booster with master cylinder assembly)

Vehicle Stability Control / Traction Control

  • Suppresses vehicle instability, such as sliding sideways when cornering and wheel slippage when accelerating from rest.

Brake booster with master cylinder assembly

  • Inverter with converter assembly
  • Airbag ECU assembly
  • Steering sensor
  • Hybrid vehicle control ECU

Control is permitted.

  • Brake warning light / yellow (minor malfunction) illuminates.
  • ABS warning light illuminates.
  • Slip indicator light illuminates.
  • Brake hold operated indicator light blinks.

U0073

U0110

U0124

U0126

U0293

(Brake booster with master cylinder assembly)

Hybrid Vehicle Regenerative Brake Coordinate Control

  • Attempts to increase the amount of energy recovered by coordinating control with the electronically controlled brake system.

Brake booster with master cylinder assembly

  • Inverter with converter assembly
  • Certification ECU (smart key ECU assembly)
  • Airbag ECU assembly
  • Hybrid vehicle control ECU

When the airbag ECU assembly is not communicating:

  • During control: When normal control is complete, hybrid vehicle regenerative brake coordinated control is prohibited.
  • Not during control: Control will not be started.

When an ECU other than the airbag ECU assembly is not communicating:

  • Hybrid vehicle regenerative brake coordinated control is stopped immediately.
  • Brake warning light / yellow (minor malfunction) illuminates.
  • ABS warning light illuminates.
  • Slip indicator light illuminates.
  • Brake hold operated indicator light blinks.

U0073

U0110

U0120

U0124

U0293

(Brake booster with master cylinder assembly)

Hill-start Assist Control

  • Maintains the brake hydraulic pressure to the 4 wheels for 2 seconds with the brake pedal released when starting off on an uphill.

Brake booster with master cylinder assembly

  • Inverter with converter assembly
  • Airbag ECU assembly
  • Steering sensor
  • Hybrid vehicle control ECU
  • During control: When normal control is complete, further control cannot be performed.
  • Not during control: Control will not be started.
  • Brake warning light / yellow (minor malfunction) illuminates.
  • ABS warning light illuminates.
  • Slip indicator light illuminates.
  • Brake hold operated indicator light blinks.

U0073

U0110

U0124

U0126

U0293

(Brake booster with master cylinder assembly)

Brake Hold Control

  • Maintains the brake oil pressure when the vehicle is stopped.

Brake booster with master cylinder assembly

  • Airbag ECU assembly
  • Brake actuator assembly
  • Hybrid vehicle control ECU

When the airbag ECU assembly is not communicating:

  • During control: When normal control is complete, brake hold control is prohibited.
  • Not during control: Control will not be started.

When an ECU other than the airbag ECU assembly is not communicating:

  • During control: A message is displayed on the multi-information display and brake hold control is canceled when the brake pedal is depressed.
  • Not during control: Control will not be started.
  • Brake warning light / red (malfunction) illuminates.
  • Brake warning light / yellow (minor malfunction) illuminates.
  • ABS warning light illuminates.
  • Slip indicator light illuminates.
  • Brake hold operated indicator light blinks.

U0073

U0124

U0128

U0293

(Brake booster with master cylinder assembly)

Dynamic Parking Brake

  • Operates the parking brake to decelerate the vehicle while the vehicle is being driven.
  • Operates the parking brake when the switch is being operated and releases it when the switch is released.

Brake actuator assembly

Brake booster with master cylinder assembly

The vehicle cannot be determined as stopped.

Brake warning light / yellow (minor malfunction) illuminates.

U0073

U0129

(Brake actuator assembly)

Static Parking Brake

  • Engages and releases the parking brake electronically according to switch operation when the vehicle is stopped.

Brake actuator assembly

Brake booster with master cylinder assembly

The vehicle cannot be determined as stopped.

Brake warning light / yellow (minor malfunction) illuminates.

U0073

U0129

(Brake actuator assembly)

Shift-linked Function

  • Engages the parking brake automatically when the shift lever is moved to P and releases the parking brake when the shift lever is moved to D, N or R.

Brake actuator assembly

  • Airbag ECU assembly
  • Brake booster with master cylinder assembly
  • Hybrid vehicle control ECU

Shift-linked function is prohibited.

Brake warning light / yellow (minor malfunction) illuminates.

U0073

U0124

U0129

U0293

(Brake actuator assembly)

Brake Hold Function

  • Keeps the vehicle stationary when the brake pedal is released while the vehicle is stopped.
  • Automatically operates the electric parking brake when requested by the skid control ECU (brake actuator assembly).

Brake actuator assembly

Brake booster with master cylinder assembly

Brake hold function prohibited.

Brake warning light / yellow (minor malfunction) illuminates.

U0073

U0129

(Brake actuator assembly)

Occupant Classification System

  • Acquires information about passengers for deployment of SRS components.

Airbag ECU assembly

Occupant detection ECU

SRS components do not deploy.

SRS warning light illuminates.

U0154

(Airbag ECU assembly)

Occupant Detection

Occupant detection ECU

  • Brake booster with master cylinder assembly
  • Airbag ECU assembly

Sends signals indicating a malfunction to the airbag ECU assembly.

SRS warning light illuminates.

U0125

U0129

(Occupant detection ECU)

Vehicle Speed Display

Combination meter assembly

Brake booster with master cylinder assembly

Speedometer is controlled based on a default vehicle speed of 0 km/h (0 mph).

  • Brake warning light / red (malfunction) illuminates.
  • ABS warning light illuminates.
  • VSC OFF indicator light illuminates.

U012987

(Combination meter assembly)

Meter Display

  • Displays vehicle condition and controls indicator lights.

Combination meter assembly

  • ECM
  • Brake booster with master cylinder assembly
  • Rack and pinion power steering gear assembly
  • Main body ECU (multiplex network body ECU)
  • Airbag ECU assembly
  • Radio and display receiver assembly
  • Air conditioning amplifier assembly
  • Headlight ECU sub-assembly LH
  • Blind spot monitor sensor RH
  • Driving support ECU assembly
  • Forward recognition camera
  • Hybrid vehicle control ECU
  • Certification ECU (smart key ECU assembly)
  • Brake actuator assembly
  • Clearance warning ECU assembly
  • Steering sensor
  • DCM (telematics transceiver)
  • Meter mirror sub-assembly
  • Inverter with converter assembly
  • Swing grille actuator assembly

Vehicle information is not displayed.

Abnormal light operation

U010087

U012987

U013187

U014287

U015187

U016387

U016487

U018287

U023387

U023A87

U029387

U032787

U110687

U111087

U111287

U113387

(Combination meter assembly)

Speedometer

  • Displays the current vehicle speed.

Meter mirror sub-assembly

Combination meter assembly

  • Vehicle speed displayed value: Displays 0.
  • Vehicle speed unit: Is not displayed.

-

U015587

(Meter mirror sub-assembly)

Display Brightness Adjustment

  • Adjusts the brightness of the display.

Meter mirror sub-assembly

Combination meter assembly

The last valid state is maintained.

-

U015587

(Meter mirror sub-assembly)

Display Position Adjustment

  • Adjusts the position of the display.

Meter mirror sub-assembly

Combination meter assembly

The last valid state is maintained.

-

U015587

(Meter mirror sub-assembly)

Display Rotation Adjustment

  • Adjusts the rotation of the display.

Meter mirror sub-assembly

Combination meter assembly

The last valid state is maintained.

-

U015587

(Meter mirror sub-assembly)

Hybrid System Indicator

Meter mirror sub-assembly

Hybrid vehicle control ECU

Operates under default control.

-

U029387

(Meter mirror sub-assembly)

Shift Position Display

  • Displays the shift position.

Meter mirror sub-assembly

Hybrid vehicle control ECU

Not displayed.

-

U029387

(Meter mirror sub-assembly)

Pre-collision System

  • Displays warning notifications.

Meter mirror sub-assembly

Driving support ECU assembly

Not displayed.

-

U110487

(Meter mirror sub-assembly)

Dynamic Radar Cruise Control System

  • Displays an icon representing the preceding vehicle, set vehicle-to-vehicle distance and set speed.

Meter mirror sub-assembly

Hybrid vehicle control ECU

Not displayed.

-

U029387

(Meter mirror sub-assembly)

Lane Departure Alert System

  • Displays the left and right road marking icons, steering icon and rest reminder icon.

Meter mirror sub-assembly

Forward recognition camera

Not displayed.

-

U023A87

(Meter mirror sub-assembly)

Intelligent Clearance Sonar System

  • Displays the operation status of the intelligent clearance warning system.

Meter mirror sub-assembly

Clearance warning ECU assembly

Not displayed.

-

U111087

(Meter mirror sub-assembly)

Information

  • Hides information icons and messages.

Meter mirror sub-assembly

Combination meter assembly

Not displayed.

-

U015587

(Meter mirror sub-assembly)

Air Conditioning Control

  • Corrects engine speed, such as for idle up.
  • Controls outlet air temperature, outlet mode change and airflow volume based on engine coolant temperature signal.
  • Corrects engine coolant temperature map and changes compressor lock judgment value.

Air conditioning amplifier assembly

  • ECM
  • Hybrid vehicle control ECU

Control is performed based on default coolant temperature of 80°C (176°F).

-

U0293

(Air conditioning amplifier assembly)

Panel Dimming Control

  • Outputs dimming information to the A/C panel according to the display dimming information.

Air conditioning amplifier assembly

Main body ECU (multiplex network body ECU)

While the power switch is on (IG), previous values are maintained (during a reset, dimming control is performed).

-

U0142

(Air conditioning amplifier assembly)

Ambient Temperature Correction Control

  • Switches air conditioning system operation condition and corrects value of displayed ambient temperature according to vehicle speed signal.

Air conditioning amplifier assembly

Combination meter assembly

Control is performed based on default vehicle speed of 0 km/h (0 mph).

-

U0155

(Air conditioning amplifier assembly)

Entry Function

  • Entry lock/unlock, entry luggage compartment open.
  • Warning
  • Performs entry illumination (Interior illumination etc.).
  • Displays messages to inform the driver that it is possible to start the hybrid control system.
  • Certification ECU (smart key ECU assembly)
  • Main body ECU (multiplex network body ECU)
  • ECM
  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly

Attempts another unlock operation.

  • Warning functions (Key confinement, Key not in vehicle, Key reminder etc.) do not operate, Hybrid control system start enabled display does not operate, Key confinement prevention control does not operate.
  • Entry lock/unlock or entry luggage compartment open does not operate.
  • Entry illumination does not operate.
  • Wrong entry warning is output.
  • Answer back occurs in succession (A maximum of 3 times).

U0100

U0142

U0155

(Certification ECU (smart key ECU assembly))

Wireless Function

  • Operates the wireless lock/unlock functions, etc.

Main body ECU (multiplex network body ECU)

Certification ECU (smart key ECU assembly)

-

Wireless lock/unlock functions and luggage compartment opener can be operated when the power switch is on (IG).

U0142

(Certification ECU (smart key ECU assembly))

Power Switch Backlighting Control

  • Turns on/off power switch illumination linked with interior lights etc.

Certification ECU (smart key ECU assembly)

  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly
  • When the power switch backlight is not illuminated:

    Does not illuminate.

  • When the power switch backlight is illuminated:

    Does not turn off.

-

U0142

(Certification ECU (smart key ECU assembly))

Security Indicator Display Function

  • Displays the immobiliser security condition.

Certification ECU (smart key ECU assembly)

Main body ECU (multiplex network body ECU)

-

Security condition cannot display normally (illuminates during security warning preparation/security warning).

U0142

(Certification ECU (smart key ECU assembly))

Security Indicator Display Function

  • Displays the immobiliser security condition.

Certification ECU (smart key ECU assembly)

Hybrid vehicle control ECU

-

Entry and start warning cannot display normally.

  • When the hybrid control system is activated, the message to show how to activate the hybrid control system does not turn off immediately.
  • When the hybrid control system is activated, the low key battery warning is not displayed.

U0293

(Certification ECU (smart key ECU assembly))

Power Switch (Power Source Control)

  • Changes the power source mode using the power switch signal as a trigger and requests the hybrid system to start when conditions are met.

Certification ECU (smart key ECU assembly)

  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly
  • Hybrid vehicle control ECU

-

  • Hybrid system start operation message is not displayed.
  • Power switch indicator blinks.

U0140

U0155

U0293

(Certification ECU (smart key ECU assembly))

Cooperative Operation

  • Cooperative control between the swing grille actuator assembly and ECM.

ECM

Swing grille actuator assembly

The grille shutter is kept fully open.

-

U028487

(ECM)

Cooperative Operation

  • Cooperative control between the inverter with converter assembly and ECM.

ECM

Inverter with converter assembly

Engine is stopped.

MIL illuminates.

U011087

(ECM)

Cooperative Operation

  • Cooperative control between the hybrid vehicle control ECU and ECM.

ECM

Hybrid vehicle control ECU

Engine is stopped.

MIL illuminates.

U029387

(ECM)

Blind Spot Monitor Control

  • Detects vehicle in blind spot of adjacent lane and informs driver.

Blind spot monitor sensor RH

  • Airbag ECU assembly
  • Steering sensor
  • Brake booster with master cylinder assembly
  • Main body ECU (multiplex network body ECU)
  • Hybrid vehicle control ECU

-

  • Displays messages on the multi-information display.
  • Outer rear view mirror indicator illuminates in amber.

U0125

U0126

U0129

U0142

U0293

(Blind spot monitor sensor RH)

Grille Shutter Opening or Closing Operation Control

  • Opens or closes the grille shutter.

Swing grille actuator assembly

  • ECM
  • Hybrid vehicle control ECU

Grille shutter opening operation is performed.

-

-

Automatic High Beam System

  • Outputs information regarding the detection of the headlights and tail lights of other vehicles by the forward recognition camera to the driving support ECU assembly.

Forward recognition camera

  • Airbag ECU assembly
  • Brake booster with master cylinder assembly
  • Main body ECU (multiplex network body ECU)
  • Hybrid vehicle control ECU
  • Millimeter wave radar sensor assembly

Performs control based on the signals received before the malfunction occurred.

Displays messages on the multi-information display.

-

LDA/SWS System

(Recognizes the lane markers of the lane the vehicle is in using the forward recognition camera and performs the following operations based on the vehicle condition and information captured by the forward recognition camera.)

  • If the system judges that the vehicle may deviate from the lane it is in, the system performs steering assist to help the driver correct the path of the vehicle.
  • If the system judges that the vehicle deviated from the lane it is in, the system sounds a buzzer to inform the driver of lane departure.
  • If the system judges unsteady driving, the system informs the driver to stop and take a rest.

Forward recognition camera

  • Airbag ECU assembly
  • Steering sensor
  • Brake booster with master cylinder assembly
  • Rack and pinion power steering gear assembly
  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly
  • Millimeter wave radar sensor assembly
  • Hybrid vehicle control ECU
  • Driving support ECU assembly

Control stops.

  • Lane departure alert indicator (yellow) illuminates.
  • Displays messages on the multi-information display.

U0101

U0123

U0126

U0129

U0131

U0142

U0155

U0235

U0293

U1104

(Forward recognition camera)

Pre-collision System

  • Outputs information regarding the detection of vehicles and pedestrians to the driving support ECU assembly.

Forward recognition camera

  • Main body ECU (multiplex network body ECU)
  • Brake booster with master cylinder assembly
  • Airbag ECU assembly
  • Hybrid vehicle control ECU
  • Millimeter wave radar sensor assembly
  • Driving support ECU assembly

Detection processing is reset and signals indicating that the forward recognition camera is not detecting objects are sent to the driving support ECU assembly.

  • PCS warning light illuminates.
  • Displays messages on the multi-information display.

U0123

U0129

U0142

U0235

U0293

U1104

(Forward recognition camera)

Pre-collision System

  • Performs pre-collision alarm control, pre-collision brake assist control and pre-collision brake control when an obstruction is detected.

Driving support ECU assembly

  • Millimeter wave radar sensor assembly
  • Forward recognition camera
  • Brake booster with master cylinder assembly
  • Airbag ECU assembly
  • Steering sensor
  • Hybrid vehicle control ECU
  • Driving support ECU assembly
  • Combination meter assembly

Control stops.

  • PCS warning light illuminates.
  • Displays messages on the multi-information display.

U0125

U0126

U0129

U0155

U0235

U023A

U0293

U1002

U1104

(Driving support ECU assembly)

Dynamic Radar Cruise Control System

  • Accelerates or decelerates the vehicle to maintain the distance to the vehicle ahead.

Hybrid vehicle control ECU

  • Brake booster with master cylinder assembly
  • Driving support ECU assembly

Control stops.

Displays messages on the multi-information display.

U012287

U029387

U110487

(Hybrid vehicle control ECU)

Dynamic Radar Cruise Control System

  • Assists driving by maintaining a specified time interval between the vehicle and preceding vehicle.

Driving support ECU assembly

  • Millimeter wave radar sensor assembly
  • Brake booster with master cylinder assembly
  • Airbag ECU assembly
  • Steering sensor
  • Hybrid vehicle control ECU
  • Forward recognition camera

Control stops.

Displays messages on the multi-information display.

U0125

U0126

U0129

U0235

U0293

U1104

(Driving support ECU assembly)

Power Steering Control

  • Calculates assist current according to torque sensor value and vehicle speed and drives motor.

Rack and pinion power steering gear assembly

  • Brake booster with master cylinder assembly
  • Hybrid vehicle control ECU
  • ECM
  • Airbag ECU assembly
  • Steering sensor
  • When steering assist is not being performed:

    Steering assist is controlled at a set amount.

  • When steering assist is being performed:

    Steering assist is suspended.

EPS warning light illuminates.

U0129

U0293

(Rack and pinion power steering gear assembly)

Assist Map Selection

  • Selects proper assist map according to destination, engine type, etc.

Rack and pinion power steering gear assembly

  • Main body ECU (multiplex network body ECU)
  • Brake booster with master cylinder assembly
  • Hybrid vehicle control ECU

Default map is used to assist because proper assist map cannot be selected. (Steering feel may be different.)

EPS warning light illuminates.

C1581

(Rack and pinion power steering gear assembly)

Auto Location

  • Displays the location and pressure value of all tires on the combination meter assembly.

Tire pressure warning ECU and receiver

Brake booster with master cylinder assembly

Auto Location function is prohibited.

-

U0129

(Tire pressure warning ECU and receiver)

Door Lock

  • Controls key linked and automatic door lock/unlock function, key confinement prevention function, etc.

Main body ECU (multiplex network body ECU)

Airbag ECU assembly

Key linked door lock/unlock function is performed even when the power switch is on (IG) and the driver seatbelt is fastened.

-

U0151

(Main body ECU (multiplex network body ECU))

Shift-linked Automatic Door Lock Function

  • Automatically locks all of the doors when the shift lever is moved to select another shift state with park (P) selected.

Main body ECU (multiplex network body ECU)

Hybrid vehicle control ECU

All of the doors are not locked automatically when all of the following conditions are met.

  • The power switch is on (IG), the engine is running and all of the doors are closed.
  • With park (P) selected, the shift lever is moved to select another shift state.

-

U0101

(Main body ECU (multiplex network body ECU))

Shift-linked Automatic Door Unlock Function

  • Automatically unlocks all of the doors when the P position switch (transmission shift main switch) is pushed with a shift state other than park (P) selected.

Main body ECU (multiplex network body ECU)

  • Hybrid vehicle control ECU
  • Combination meter assembly

All of the doors are not locked automatically when all of the following conditions are met.

  • The power switch is on (IG), the engine is running and all of the doors are closed.
  • With park (P) selected, the shift lever is moved to select another shift state.

-

U0101

U0155

(Main body ECU (multiplex network body ECU))

Speed-sensitive Automatic Door Lock Function

  • Automatically locks all of the doors when the vehicle is determined that the vehicle is being driven.

Main body ECU (multiplex network body ECU)

Combination meter assembly

All of the doors are not locked automatically when all of the following conditions are met.

  • The power switch is on (IG) and the engine is running.
  • Vehicle speed is higher than approximately 20 km/h (12 mph).

-

U0155

(Main body ECU (multiplex network body ECU))

Manual Unlock Prohibition Function

  • When it is determined that the vehicle is parked and the doors are locked or closed after the driver has left the vehicle, unlocking the vehicle using the door control switch is prohibited.

Main body ECU (multiplex network body ECU)

  • ECM
  • Hybrid vehicle control ECU
  • The manual unlock prohibition cannot be canceled when the hybrid control system has been started.
  • The manual unlock prohibition cannot be canceled when the vehicle is in the ready state.

-

U0100

U0293

(Main body ECU (multiplex network body ECU))

Power Door Lock Control System Customize Setting

  • Enables or disables each power door lock or unlock function in accordance with user operation.

Main body ECU (multiplex network body ECU)

Hybrid vehicle control ECU

  • Shift linked automatic lock control does not occur.
  • Automatic lock/unlock cannot be changed.

-

U0101

(Main body ECU (multiplex network body ECU))

Wireless Function

  • Locks and unlocks doors, etc. via remote operation.

Main body ECU (multiplex network body ECU)

Certification ECU (smart key ECU assembly)

The doors cannot be locked or unlocked via remote operation.

-

-

Entry Lock/Unlock

  • Locks or unlocks doors using the entry lock/unlock operation.

Main body ECU (multiplex network body ECU)

Certification ECU (smart key ECU assembly)

The doors cannot be locked or unlocked via remote operation.

-

U0327

(Main body ECU (multiplex network body ECU))

Wireless Door Lock Buzzer

  • Sounds when the doors are locked/unlocked by wireless operation.

Main body ECU (multiplex network body ECU)

Certification ECU (smart key ECU assembly)

The wireless door lock buzzer does not sound when the doors are locked/unlocked by wireless operation.

-

U0327

(Main body ECU (multiplex network body ECU))

Seat and Mirror Control

Main body ECU (multiplex network body ECU)

  • Position control ECU assembly LH
  • Multiplex tilt and telescopic ECU
  • Outer mirror control ECU assembly LH
  • Outer mirror control ECU assembly RH
  • Brake actuator assembly
  • Combination meter assembly
  • Certification ECU (smart key ECU assembly)

Memory function does not operate.

-

U0155

U0199

U0200

U0208

U0327

U1106

U1115

(Main body ECU (multiplex network body ECU))

Luggage Compartment Door Opener System

  • Unlocks and unlatches the luggage compartment door when the luggage electrical key switch is pushed and held with the luggage compartment door locked.

Main body ECU (multiplex network body ECU)

Certification ECU (smart key ECU assembly)

When the luggage electrical key switch is pushed and held with the luggage compartment door locked, the luggage compartment door does not unlatch.

-

U0327

(Main body ECU (multiplex network body ECU))

Luggage Compartment Door Opener System

  • Unlatches the luggage compartment door when the luggage door opening switch assembly is pushed.

Main body ECU (multiplex network body ECU)

  • Hybrid vehicle control ECU
  • Combination meter assembly

When the luggage door opening switch assembly is pushed and held, the luggage compartment door does not unlatch.

-

U0101

U0155

(Main body ECU (multiplex network body ECU))

Dome Lights

  • Illuminates when approaching any of the doors while holding an entry key.

Main body ECU (multiplex network body ECU)

Certification ECU (smart key ECU assembly)

The interior lights remain off when the electrical key transmitter sub-assembly is close to any of the doors.

-

U0327

(Main body ECU (multiplex network body ECU))

Dimmer Controlled Illumination

  • Dims the illumination of the instrument panel ambient illumination lights or ambient illumination lights when the vehicle starts driving.

Main body ECU (multiplex network body ECU)

Hybrid vehicle control ECU

The interior lights remain on without being dimmed when the shift state is park (P) and a shift state other than park (P) is selected.

-

U0101

(Main body ECU (multiplex network body ECU))

Alarm Function

  • In the armed state, the alarm function judges break-in according to changes in door courtesy status and the alarm sounds.

Main body ECU (multiplex network body ECU)

  • Hybrid vehicle control ECU
  • Certification ECU (smart key ECU assembly)
  • ECM
  • After the vehicle is locked using wireless operation, pressing the push start switch before the alarm is set does not unset the alarm and, after a specified period of time, the alarm will be set.
  • While in the alarm sounding state, the alarm is not canceled when a registered smart key is certified and the push start switch is pressed.
  • When the alarm is sounding, the alarm is not canceled when the engine has been started.

-

U0100

U0120

(Main body ECU (multiplex network body ECU))

Auxiliary Battery Saving Function

  • When it is determined that the vehicle is parked, stops sending illumination request signals and cuts power to the interior lights to avoid a depleted battery.

Main body ECU (multiplex network body ECU)

Certification ECU (smart key ECU assembly)

When the auxiliary battery is in battery saving mode and any of the doors are approached while holding an entry key, the auxiliary battery saving function is not canceled and the interior illuminations do not illuminate.

-

U0327

(Main body ECU (multiplex network body ECU))

Headlight System Malfunction Warning Display

  • Detects an open circuit or a malfunctioning ECU in the LED headlight system and informs the driver of the malfunction.

Main body ECU (multiplex network body ECU)

  • ECM
  • Hybrid vehicle control ECU
  • When an LED headlight malfunction is detected, the LED headlight warning display is not displayed when the low beam headlights are turned on when the hybrid control system has been started.
  • When an LED headlight malfunction is detected, the LED headlight warning display is not displayed when the low beam headlights are turned on when the power switch is turned on (READY).

-

U0100

U0293

(Main body ECU (multiplex network body ECU))

Meter Illumination Auto Dimmer

  • Determines whether it is daytime or nighttime based on the automatic light control sensor signals and, when it is determined that it is nighttime or dark, dims the meter illumination according to interior light illuminations and tail cancel switch state.

Main body ECU (multiplex network body ECU)

Combination meter assembly

The meter illumination is dimmed when the tail cancel switch is on.

-

U0155

(Main body ECU (multiplex network body ECU))

Key Off Operation

  • Permits the power window to operate for 43 seconds after the power switch is turned off.

Main body ECU (multiplex network body ECU)

  • ECM
  • Hybrid vehicle control ECU
  • Even though the engine is started, power window operation is not permitted.
  • Even though the power switch is on (READY), power window operation is not permitted.

-

U0100

U0293

(Main body ECU (multiplex network body ECU))

Headlights Left Off Warning

  • Suggests that the driver turns the headlights on when the headlights are not illuminated while driving at night.

Main body ECU (multiplex network body ECU)

Combination meter assembly

The suggestion that the driver turns the headlights on is not displayed on the multi-information display in the combination meter assembly when the headlight dimmer switch is OFF or TAIL while driving at night.

-

U0155

(Main body ECU (multiplex network body ECU))

Automatic High Beam System

  • Controls the high beam automatically when the forward recognition camera detects a preceding vehicle or an oncoming vehicle.

Main body ECU (multiplex network body ECU)

  • Headlight ECU sub-assembly LH
  • Forward recognition camera

Automatic high beam system does not operate.

Automatic high beam indicator light flashes.

U0182

U023A

(Main body ECU (multiplex network body ECU))

Air Conditioning Control

  • Controls air conditioning functions.

Radio and display receiver assembly

Air conditioning amplifier assembly

  • Air conditioning system indicators turn off.
  • If set temperature is shown on multi-information display or multi-display, set temperature display turns off.

-

U0073

U0164

(Radio and display receiver assembly)

Intuitive Parking Assist System Setting/Notification

  • Controls the settings for the clearance sonar screen notifications.

Radio and display receiver assembly

  • Hybrid vehicle control ECU
  • Clearance warning ECU assembly

Returns to the previous display.

-

U0073

U1110

(Radio and display receiver assembly)

Fuel Consumption Display

  • Displays graph of fuel consumption per minute and history of total fuel consumption.

Radio and display receiver assembly

  • ECM
  • Brake booster with master cylinder assembly
  • Combination meter assembly
  • Hybrid vehicle control ECU
  • The fuel consumption calculation is not performed.
  • The existing data is cleared and the per-minute fuel consumption calculation resumes after normal data is received again.
  • If the fuel consumption display scale signal (FC_SCL) or drive monitor unit signal (UNIT_6) cannot be received from the combination meter assembly, the display shows the last known value.

-

U0073

U0100

U0129

U0155

U0293

(Radio and display receiver assembly)

HV Energy Flow Display

  • Creates energy flow screen which indicates regeneration status and drive force transmission status.

Radio and display receiver assembly

Hybrid vehicle control ECU

  • Energy flow is not displayed (only the energy flow route is displayed).
  • The last valid SOC of the HV battery is displayed.

-

U0073

U0293

(Radio and display receiver assembly)

Destination Identification

  • Identifies destination based on destination and destination package information, and selects the time zone and language used for the display.

Radio and display receiver assembly

Main body ECU (multiplex network body ECU)

Determines the destination according to the last received value and operates accordingly (if there is no last received value, the system operates using the default value).

Time zone and language selection screen are different from actual destination.

U0073

U0140

(Radio and display receiver assembly)

Vehicle Customize Function

  • Changes the behavior and control parameters of various functions (illumination lighting time, etc.) according to the user operation via the screen.

Radio and display receiver assembly

  • Main body ECU (multiplex network body ECU)
  • Air conditioning amplifier assembly
  • Certification ECU (smart key ECU assembly)
  • Position control ECU assembly LH
  • When an application that uses phase 4 remote communication is activated (customization/remote diagnosis), the process will be performed regardless of main body ECU (multiplex network body ECU) remote communication permit/prohibit state.
  • The enter button is grayed out and selection is not possible.
  • Performs customization according to diagnostic communication
  • Retries 3 times

-

U0073

(Radio and display receiver assembly)

Back Guide Monitor Function

  • Displays the image from the rear view camera with the predicted path guide lines, vehicle width extension guide lines and distance guide lines overlaid when reversing.

Radio and display receiver assembly

  • Hybrid vehicle control ECU
  • Television camera assembly
  • When in camera diagnostic mode, transitions to the multi-media screen and the camera diagnosis screen starts.
  • When DTC C1610 is stored, current DTC C1610 is cleared.
  • Sends reactive force setting completion notifications and pointer coordinates as a setting signal for each error when it occurs. Treats the camera screen pattern as a setting signal for each error when it occurs, and performs the reactive force setting when the camera image is displayed.
  • When in camera mode, transitions to the multi-media screen and the camera screen.

-

U0073

U0265

(Radio and display receiver assembly)

Remote Service Function

  • Notifies the center with information of the user operation such as proceeding to the warning screen, remote immobiliser screen or a screen for using the remote service, via the DCM (telematics transceiver).

Radio and display receiver assembly

DCM (telematics transceiver)

The remote screen is not displayed.

-

U0073

U0198

(Radio and display receiver assembly)

Meter-linked Function

  • Changes display based on customization information set through the meter.
  • Outputs the customization information set in the system.

Radio and display receiver assembly

Combination meter assembly

  • Language, unit and accent color linking: Maintains the last valid settings.
  • GS search: Performs control without confirming if there is a GS search request. Uses the last valid settings. Grays out the settings to prevent them from being changed when displayed.

-

U0073

U0155

(Radio and display receiver assembly)

Information Sound Adjustment Function

  • Receives flags from the driving support ECU assembly to operate the alarm, and limits or mutes multimedia audio while the alarm is operating.

Radio and display receiver assembly

Driving support ECU assembly

Audio mute is canceled.

-

U0073

(Radio and display receiver assembly)

Panoramic View Monitor

Radio and display receiver assembly

  • Hybrid vehicle control ECU
  • Television camera assembly
  • Parking assist ECU
  • When in camera diagnostic mode, transitions to the multi-media screen and the camera diagnosis screen starts.
  • When DTC C1610 is stored, current DTC C1610 is cleared.
  • Sends reactive force setting completion notifications and pointer coordinates as a setting signal for each error when it occurs. Treats the camera screen pattern as a setting signal for each error when it occurs, and performs the reactive force setting when the camera image is displayed.
  • When in camera mode, transitions to the multi-media screen and the camera screen.

-

U0073

U023B

(Radio and display receiver assembly)

Back Guide Monitor Function

  • Monitors the shift position signal, steering angle signal and vehicle speed, and displays the predicted path guide lines on the screen based on the steering angle when reversing.

Television camera assembly

  • Main body ECU (multiplex network body ECU)
  • Steering sensor
  • Radio and display receiver assembly
  • Blind spot monitor sensor RH
  • Hybrid vehicle control ECU
  • Control stops.
  • Rear cross traffic alert function information is not displayed in back guide monitor function.
  • Intuitive parking assist system information is not displayed in back guide monitor function.
  • All guide lines, the clearance sonar icon and rear cross traffic alert icon are not displayed.
  • Switches on the screen are grayed out.

"!" is displayed on the camera screen.

U0100

U0126

U0140

U0163

U0233

U1000

(Television camera assembly)

Rear Camera Detection Function

  • Monitors the shift position signal and vehicle speed and displays a warning message on the screen and sounds a buzzer to warn the driver when a pedestrian is detected in the image of the camera when reversing.

Television camera assembly

  • Steering sensor
  • Brake booster with master cylinder assembly
  • Main body ECU (multiplex network body ECU)
  • Blind spot monitor sensor RH
  • Hybrid vehicle control ECU
  • Clearance warning ECU assembly
  • Radio and display receiver assembly
  • Parking assist ECU

Control stops.

Displays messages on the multi-information display.

U0100

U0126

U0129

U0140

U0163

U0233

U023B

U1000

(Television camera assembly)

Panoramic View Monitor

  • Displays the bird's-eye view, back view, side view and front view of the vehicle on the multi-information display.
  • Displays guide lines on the panoramic view monitor screen.
  • Displays the detection area of the clearance sonar sensor.
  • Displays the detection status of the rear cross traffic alert.
  • Displays the detection status of each camera.

Parking assist ECU

  • Hybrid vehicle control ECU
  • Brake booster with master cylinder assembly
  • Main body ECU (multiplex network body ECU)
  • Steering sensor
  • Clearance warning ECU assembly
  • Radio and display receiver assembly
  • Blind spot monitor sensor RH
  • Television camera assembly
  • Panoramic view monitor system does not operate.
  • Rear cross traffic alert function information is not displayed in panoramic view monitor system.
  • Intuitive parking assist system information is not displayed in panoramic view monitor system.
  • All guide lines, the clearance sonar icon and rear cross traffic alert icon are not displayed.
  • Switches on the screen are grayed out.

"!" is displayed on the camera screen.

U0073

U0100

U0126

U0129

U0140

U0163

U0233

U0265

U1110

U1000

(Parking assist ECU)

Ambient Temperature Display

  • Used for correction of the distance measured using the ultrasonic sensors.

Clearance warning ECU assembly

Air conditioning amplifier assembly

-

-

U0164

(Clearance warning ECU assembly)

Intuitive Parking Assist System

  • Provides notification when an obstacle is detected.

Clearance warning ECU assembly

  • ECM
  • Steering sensor
  • Brake booster with master cylinder assembly
  • Hybrid vehicle control ECU

Intuitive parking assist control is stopped.

-

U0073

U0100

U0126

U0129

U0293

U1000

(Clearance warning ECU assembly)

Intelligent Clearance Sonar System

  • Controls the driving torque and brake operation just before a collision.

Clearance warning ECU assembly

  • ECM
  • Airbag ECU assembly
  • Steering sensor
  • Main body ECU (multiplex network body ECU)
  • Brake booster with master cylinder assembly
  • Hybrid vehicle control ECU
  • Blind spot monitor sensor RH
  • Blind spot monitor sensor LH

Intelligent clearance sonar control is stopped.

  • Displays messages on the multi-information display.
  • Buzzer sounds.
  • ICS OFF indicator light blinks.

U0073

U0100

U0124

U0126

U0129

U0232

U0233

U0293

U1000

(Clearance warning ECU assembly)

Remote Check

  • Sends driving distance and remaining fuel information displayed on the combination meter to the service center so that the information can be checked on a cell phone.

DCM (telematics transceiver)

Combination meter assembly

Function is disabled.

Notification displayed on smartphone via the application.

U0155

(DCM (telematics transceiver))

TOYOTA Entune System

  • Guest Driver Monitor

DCM (telematics transceiver)

  • Combination meter assembly
  • Main body ECU (multiplex network body ECU)

Function is disabled.

Notification displayed on smartphone via the application.

U0142

U0155

(DCM (telematics transceiver))

TOYOTA Entune System

  • Vehicle Status Alerts

DCM (telematics transceiver)

Main body ECU (multiplex network body ECU)

Function is disabled.

Notification displayed on smartphone via the application.

U0142

(DCM (telematics transceiver))

TOYOTA Entune System

  • Remote Door Lock and Unlock

DCM (telematics transceiver)

Main body ECU (multiplex network body ECU)

Function is disabled.

Notification displayed on smartphone via the application.

U0142

(DCM (telematics transceiver))

TOYOTA Entune System

  • Remote Engine Start and Stop

DCM (telematics transceiver)

Main body ECU (multiplex network body ECU)

Function is disabled.

Notification displayed on smartphone via the application.

U0142

(DCM (telematics transceiver))

Mirror Operation Control

  • Controls the operation of the outer mirrors based on signals such as the mirror switch signal from the main body ECU (multiplex network body ECU).
  • Outer mirror control ECU assembly LH
  • Outer mirror control ECU assembly RH

Main body ECU (multiplex network body ECU)

Manual mirror operation is prohibited.

-

U0142

(Outer mirror control ECU assembly LH)

U0142

(Outer mirror control ECU assembly RH)

Reverse-shift Linked Door Mirror Operation

  • Controls the reverse operation of the outer mirrors based on reverse request information from the main body ECU (multiplex network body ECU).
  • Outer mirror control ECU assembly LH
  • Outer mirror control ECU assembly RH

Main body ECU (multiplex network body ECU)

Reverse-shift linked door mirror function does not operate.

-

-

Mirror Surface Position Memory and Recall

  • Memorizes the mirror surface positions based on the memory request signal from the main body ECU (multiplex network body ECU) and adjusts the outer mirror surfaces to the memorized positions.
  • Outer mirror control ECU assembly LH
  • Outer mirror control ECU assembly RH

Main body ECU (multiplex network body ECU)

Mirror surface position cannot be memorized or recalled.

-

-

Mirror Heater Control

  • Controls the outer mirror heater in accordance with the main body ECU (multiplex network body ECU) based on the state of the defogger switch, etc.
  • Outer mirror control ECU assembly LH
  • Outer mirror control ECU assembly RH
  • Main body ECU (multiplex network body ECU)
  • Air conditioning amplifier assembly

Mirror heaters do not operate.

-

U0142

(Outer mirror control ECU assembly LH)

U0142

(Outer mirror control ECU assembly RH)

Mirror Retract/Return Operation

  • Controls retract/return operation of the outer mirrors based on signals such as mirror switch signal from main body ECU (multiplex network body ECU).
  • Outer mirror control ECU assembly LH
  • Outer mirror control ECU assembly RH

Main body ECU (multiplex network body ECU)

Mirrors cannot be retracted or returned.

-

-

Illumination Control

  • Controls the illumination of the lights in accordance with the main body ECU (multiplex network body ECU).
  • Outer mirror control ECU assembly LH
  • Outer mirror control ECU assembly RH

Main body ECU (multiplex network body ECU)

Mirror foot light does not illuminate.

-

-

Auto Away Function

  • Moves the steering wheel to the most retracted position and tilts to the top if the system detects the driver side seat belt is unfastened and the power switch is turned off.

Multiplex tilt and telescopic ECU

  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly

Control is suspended (manual operation is still possible).

-

U014287

U015587

(Multiplex tilt and telescopic ECU)

Auto Return Function

  • Returns the steering wheel to the position before the auto-away operation was performed (multiplex tilt and telescopic ECU memorized position) when the power switch is turned ON or the driver side seat belt is fastened.

Multiplex tilt and telescopic ECU

  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly

Control is suspended (manual operation is still possible).

-

U014287

U015587

(Multiplex tilt and telescopic ECU)

Memory Function

  • Memorizes or recalls the steering wheel position in accordance with the operation of the memory switch.

Multiplex tilt and telescopic ECU

  • Main body ECU (multiplex network body ECU)
  • Combination meter assembly
  • Position control ECU assembly LH

Control is suspended (manual operation is still possible).

-

U014287

U015587

U020887

(Multiplex tilt and telescopic ECU)

User Customize Function

  • Changes the behavior and control parameters of the auto-away and auto-return functions according to multi-media operation.

Multiplex tilt and telescopic ECU

  • Main body ECU (multiplex network body ECU)
  • Radio and display receiver assembly

Control is suspended (manual operation is still possible).

-

U014287

(Multiplex tilt and telescopic ECU)

Memory Seat Playback Control

  • Controls the memorization and setting of the seat position by controlling corresponding motors in accordance with the main body ECU (multiplex network body ECU).

Position control ECU assembly LH

Main body ECU (multiplex network body ECU)

Control stops.

-

-

  • Controls the forward/rearward slide distance of the seat in accordance with the main body ECU (multiplex network body ECU).

Position control ECU assembly LH

Main body ECU (multiplex network body ECU)

Control stops.

-

-

Light control

  • Controls the illumination of the low beams, high beams, daytime running lights and clearance lights.
  • Headlight ECU sub-assembly LH
  • Headlight ECU sub-assembly RH

Main body ECU (multiplex network body ECU)

  • High beams: Off (maintains previous value for 3 seconds after stopped).
  • Adaptive high beam system: Stopped (maintains low beam).
  • Daytime running light/clearance light: Left and right clearance lights turned on and left and right daytime running lights turned off.

-

U0142

(Headlight ECU sub-assembly LH)

U0142

(Headlight ECU sub-assembly RH)

    Electric Parking Brake ECU Communication Stop Mode

    Front Camera Module Communication Stop Mode

    See More:

    Toyota Avalon Service & Repair Manual > Ambient Light: Removal
    REMOVAL PROCEDURE 1. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL LH Click here 2. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL RH Click here 3. REMOVE FRONT CONSOLE UPPER PANEL GARNISH Click here 4. REMOVE INSTRUMENT PANEL CUP HOLDER ASSEMBLY (a) Remove the 7 screws and instrument panel cup holder asse ...

    Toyota Avalon Owners Manual

    Toyota Avalon Service & Repair Manual

    © 2024 Copyright www.tavalon.net
    0.0216