Toyota Avalon (XX50): Wireless Door Lock Control System(for Gasoline Model)

Wireless Door Lock Tuner Circuit Malfunction (B1242)

DESCRIPTION

The electrical key and tire pressure monitoring system receiver assembly is used to receive radio waves related to the entry functions of the electrical key transmitter sub-assembly. The certification ECU (smart key ECU assembly) decodes the requested electrical key transmitter sub-assembly operation by identifying a key code based on the radio waves received via the electrical key and tire pressure monitoring system receiver assembly. The electrical key and tire pressure monitoring system receiver assembly receives a signal from the electrical key transmitter sub-assembly and sends signals to the main body ECU (multiplex network body ECU) through the certification ECU (smart key ECU assembly). (ex. If a door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU (multiplex network body ECU)).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key(CAN). While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
• Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

  Click here

• When replacing or inspecting the electrical key and tire pressure monitoring system receiver assembly and wire harness, do not change the position or length of the wire harness. If the wire harness is too close to the electrical key and tire pressure monitoring system receiver assembly, the performance of the entry function and wireless function may be affected.
• This DTC is not stored within 10 seconds of the engine switch being turned from on (IG) to off.
• Make sure that there are no electrical key transmitter sub-assemblies in the vehicle.
• When replacing the electrical key and tire pressure monitoring system receiver assembly, read the transmitter IDs (tire pressure warning system) stored in the old ECU using the Techstream and write them down before removal.

  Click here

• If the electrical key and tire pressure monitoring system receiver assembly has been replaced, it is necessary to perform initialization (Click here ) after registration (Click here ) of the transmitter IDs to the electrical key and tire pressure monitoring system receiver assembly.

PROCEDURE

(a) Disconnect the K11 electrical key and tire pressure monitoring system receiver assembly connector.

(b) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.

Standard Voltage:

Standard Resistance:

OK

REPLACE ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY

NG

(a) Disconnect the K10 certification ECU (smart key ECU assembly) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Customer Problem Analysis Check

CUSTOMER PROBLEM ANALYSIS CHECK

HINT:

Be sure to ask the customer in detail about the following points concerning the vehicle operating conditions, environment and problem, and then check for DTCs.

• If the entry lock/unlock function does not operate for all doors.
• If the entry lock function does not operate.
• If the entry unlock function does not operate.
• If both the entry lock and unlock functions do not operate.
• If the wireless lock and unlock functions do not operate.
• If the power source mode does not change even though the engine switch was pressed (does not change to on (ACC)).
• If the engine cannot be started with the push-button start function.
• If an engine start was attempted by holding the electrical key transmitter sub-assembly near the engine switch and then pressing the engine switch.
• If the warning buzzers inside the vehicle do not sound.
• If the warning buzzers outside the vehicle do not sound.
• If the steering wheel does not unlock.
• Any other details concerning the problem.

HINT:

If it is suspected that wave interference is likely, be sure to ask the customer in detail about the following points concerning the vehicle operating conditions, environment and problem.

• Specific locations where the system does not operate (such as near TV towers, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc.).
• Specific times when the system does not operate: If the symptoms occurred immediately after purchase or only recently. If the symptoms occurred when the electrical key transmitter sub-assembly was near the vehicle (electrical key antenna).
• If the system does not operate only when near specific vehicles (there may be wave interference from the wireless systems of other vehicles).
• If the system operates intermittently.
• If the electrical key transmitter sub-assembly is bundled together with other items.
• If the electrical key transmitter sub-assembly is carried together with other electronic devices, such as cell phones, personal computers, portable music players, other electrical key transmitter sub-assemblies, etc. (make sure to keep the electrical key transmitter sub-assembly at least 0.1 m (0.328 ft.) away from such items).
• Where the electrical key transmitter sub-assembly is being kept when not in use: If the electrical key transmitter sub-assembly is being placed within 1 m (3.28 ft.) of items such as TVs, DVD recorders, induction cookers, rice cookers, dishwashers, modems, cell phones, personal computers, microwave ovens, desk or floor lamps, cordless telephones, etc.
• If there are electronic devices that transmit radio waves placed in the vehicle.
• When the transmitter battery was last replaced. The transmitter battery capacity can be approximated using the Key Low Battery Data List item.

  Click here

• If the customer installed any optional components (theft deterrent devices, wireless fog lights, etc.) to the vehicle.

Customize Parameters

CUSTOMIZE PARAMETERS

CUSTOMIZE WIRELESS DOOR LOCK CONTROL SYSTEM

NOTICE:

• When the customer requests a change in a function, first make sure that the function can be customized.
• Be sure to make a note of the current settings before customizing.
• When troubleshooting a function, first make sure that the function is set to the default setting.

HINT:

The following items can be customized.

(a) Customizing with the Techstream

(1) Connect the Techstream to the DLC3.

(2) Turn the engine switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Customize Setting / Wireless Door Lock.

(5) Select the setting by referring to the table below.

(b) Customizing with the multi-display

(1) Turn the engine switch on (IG).

(2) Enter the following menus: MENU / Setup / Vehicle / Vehicle Customization / Door Lock Settings.

(3) Select the setting by referring to the table below.

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body or Smart Key / Data List.

(e) Read the Data List according to the display on the Techstream.

ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Dtc Check / Clear

DTC CHECK / CLEAR

NOTICE:

• If DTCs are output, save and check all output DTCs.
• When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key(CAN). While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.

CHECK DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Smart Key / Trouble Codes.

(e) Check for DTCs.

Click here

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Smart Key / Trouble Codes.

(e) Clear the DTCs.

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

NOTICE:

Make sure to check the following before proceeding with troubleshooting.

• Do not perform "Smart Code Reset" (all key ID erasure) until the malfunctions and symptoms have been confirmed and resolved. If all key ID erasure is performed without confirming or resolving malfunctions, key registration will be unable to be performed, resulting in unnecessary part replacement.
• Make sure that the smart key system has not been disabled by a customize setting.

HINT:

• Replace parts related to the wireless door lock control system and smart key system according to the inspection procedure.
• If the wireless door lock control system and smart key system do not operate, check the customize setting and make sure that the wireless door lock control system and smart key system are not disabled.
• The wireless door lock control system and smart key system primarily use the following systems.
  • Power door lock control system
  • Wireless door lock control system
  • Smart key system (for Entry Function)
  • Smart key system (for Start Function)
    • Steering lock function
    • Immobiliser function
• If 2 or more electrical key transmitter sub-assemblies are registered to the system, make sure to perform troubleshooting with all of them.

PROCEDURE

(a) Confirm how the vehicle was brought to the workshop.

• Vehicle was driven.
• Vehicle was towed.

HINT:

The cause of the malfunction may be narrowed down by confirming whether the vehicle was driven or towed.

NEXT

GO TO SMART KEY SYSTEM (for Start Function)

No Answer-Back

DESCRIPTION

In some cases, wireless door lock control functions are normal but the hazard warning light and wireless door lock buzzer answer-back function do not operate. In such cases, hazard warning light and wireless door lock buzzer signal outputs from the main body ECU (multiplex network body ECU) may be malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• The wireless door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the wireless door lock control system after confirming that the communication system is functioning properly.

  Click here

• Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

  Click here

• Before performing the inspection, check that DTC B1242 is not output.

PROCEDURE

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Customize Setting / Wireless Door Lock.

(e) Select the setting by referring to the table below.

B

PERFORM CUSTOMIZE FUNCTION

A

(a) Check the wireless door lock control function using the electrical key transmitter sub-assembly.

Click here

B

GO TO PROBLEM SYMPTOMS TABLE

A

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

OK:

The Techstream display changes correctly in response to the lock/unlock operation.

NG

GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit)

OK

(a) Check the wireless answer-back operation using the electrical key transmitter sub-assembly.

Click here

B

GO TO STEP 9

A

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Perform the Active Test according to the display on the Techstream.

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

A

(a) Disconnect the A13 wireless door lock buzzer connector.

(b) Perform the Active Test according to the display on the Techstream.

(c) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition A13-1 (B) - A13-2 (E) Active Test Wireless Buzzer is OFF Below 1 V Active Test Wireless Buzzer is ON Pulse generation (frequency: 2 kHz, high voltage: 11 to 14 V, low voltage: below 1 V)

*a Front view of wire harness connector (to Wireless Door Lock Buzzer)

OK

REPLACE WIRELESS DOOR LOCK BUZZER

NG

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

(b) Reconnect the instrument panel junction block assembly connectors.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

(a) Disconnect the 4F instrument panel junction block assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Check that the hazard warning lights blink when the hazard warning signal switch is pressed.

OK:

Hazard warning lights blink.

A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

B

GO TO LIGHTING SYSTEM (Proceed to Hazard Warning Switch Circuit)

C

GO TO LIGHTING SYSTEM (Proceed to Hazard Warning Switch Circuit)

Operation Check

OPERATION CHECK

NOTICE:

Make sure that the vehicle is in an area that allows the wireless control function to operate.

HINT:

• The switches described in this text are the switches for transmitting signals. The switches are built into the electrical key transmitter sub-assembly.
• All the functions listed below must be checked in comparison with the wireless door lock control operation area.

CHECK CUSTOMIZE PARAMETERS

(a) The operation check below is based on the non-customized initial condition of the vehicle.

Click here

CHECK BASIC FUNCTIONS

(a) Check that the LED of the electrical key transmitter sub-assembly illuminates and turns off 3 times when each switch is pressed and held for 5 seconds.

HINT:

If the transmitter LED illuminates once or twice but not a third time when the switch has been pressed and held for 5 seconds or more, it may have a weak battery.

(b) Check that all of the doors lock when the lock switch is pressed.

(c) Check that the driver door unlocks when the unlock switch is pressed once, and all of the doors unlock when pressed twice within 5 seconds.

(d) Check that the luggage compartment door opens when the luggage open switch is pressed and held for 0.8 seconds or more.

CHECK THE CHATTERING PREVENTION FUNCTION

(a) Press and hold the lock or unlock switch on the electrical key transmitter sub-assembly and check that the corresponding operation occurs only once and is not repeated continuously while the switch is held. Then press the switch repeatedly at 1-second intervals, check that the corresponding operation is carried out.

CHECK THE SWITCH OPERATION FAIL-SAFE FUNCTION

(a) Check that the doors cannot be locked/unlocked by operating a switch on an unregistered electrical key transmitter sub-assembly, but that the doors can be locked/unlocked by operating a switch on the registered electrical key transmitter sub-assembly.

CHECK THE REPEAT FUNCTION

(a) Check that all of the doors attempt to automatically lock 1 second after the lock switch has been pressed while the driver door control knob is being held in the unlock position.

CHECK THE AUTOMATIC LOCKING FUNCTION

(a) Check that the doors lock automatically if none of the doors have been opened or all of the doors have not been locked within approximately 60 seconds of all of the doors being unlocked by pressing the unlock switch.

(b) Check that the automatic locking function does not operate when any door has been opened within approximately 60 seconds of unlocking the doors by pressing the unlock switch.

(c) Check that the automatic locking function does not operate when all of the doors have been locked manually (such as using key linked operation, or by pressing the lock switch) within approximately 60 seconds of unlocking the doors by pressing the unlock switch.

HINT:

When the Wireless Lock Function with Doors Open customize setting is set to ON, this function will be disabled even if the Open Door Warning customize setting is set to ON.

CHECK THE DOOR AJAR WARNING BUZZER FUNCTION

(a) Check that the wireless door lock buzzer sounds for approximately 5 seconds when the lock switch is pressed with any of the doors ajar or open.

HINT:

When the Wireless Lock Function with Doors Open customize setting is set to ON, the door ajar warning buzzer function will be disabled even if the Open Door Warning customize setting is set to ON.

CHECK THE WIRELESS RESERVATION LOCK FUNCTION

(a) Check that the doors are locked by performing a wireless lock operation with any door open.

(b) Check that answer-back (wireless door lock buzzer) function operates when the wireless operation is performed and answer-back (hazard warning light) function operates when the doors are closed.

CHECK THE ANSWER-BACK (HAZARD WARNING LIGHT) FUNCTION

(a) When the lock switch is pressed, check that the hazard warning lights flash once simultaneously with the locking operation of all of the doors.

(b) When the unlock switch is pressed, check that the hazard warning lights flash twice simultaneously with the unlocking operation of all of the doors.

CHECK THE ANSWER-BACK (WIRELESS DOOR LOCK BUZZER) FUNCTION

(a) When the lock switch is pressed, check that the buzzer sounds once simultaneously with the locking operation of all of the doors.

(b) When the unlock switch is pressed once, check that the buzzer sounds twice simultaneously with the unlocking operation of the driver door.

CHECK THE PANIC ALARM CONTROL FUNCTION

Click here

CHECK THE ILLUMINATED ENTRY FUNCTION

Click here

CHECK THE SLIDING ROOF OPEN FUNCTION (w/ Sliding Roof System)

Click here

CHECK THE POWER WINDOW OPERATION FUNCTION

Click here

Parts Location

PARTS LOCATION

ILLUSTRATION

ILLUSTRATION

ILLUSTRATION

Precaution

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTICE:

When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

PRECAUTIONS WHEN USING TECHSTREAM

(a) When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key(CAN). While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.

PRECAUTION FOR REGISTRATION

(a) Before replacing any of the following parts, refer to Registration.

Click here

• Certification ECU (smart key ECU assembly)
• Electrical key transmitter sub-assembly
• Main body ECU (multiplex network body ECU)

(b) Electrical key and tire pressure monitoring system receiver assembly

(1) When replacing the electrical key and tire pressure monitoring system receiver assembly, read the transmitter IDs (tire pressure warning system) stored in the old ECU using the Techstream and write them down before removal.

Click here

(2) If the electrical key and tire pressure monitoring system receiver assembly has been replaced, it is necessary to perform initialization (Click here ) after registration (Click here ) of the transmitter IDs to the electrical key and tire pressure monitoring system receiver assembly.

PRECAUTIONS FOR ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

Click here

NOTICE WHEN CHECKING FOLLOWING

(a) Wireless door lock/unlock function:

This wireless door lock control function operates only when the following 3 conditions are met:

(1) The engine switch is off.

(2) All of the doors are closed.*

• *: When the Wireless Lock Function with Doors Open customize setting is set to OFF

(3) The power door lock control system is operating properly.

HINT:

The unlock function operates even when a door is open.

(b) The size of the wireless door lock control operation area differs depending on the situation.

(1) The size of the operation area differs depending on the user and the way the electrical key transmitter sub-assembly is held.

(2) In certain areas, the wireless door lock control function will only operate partially for the operation area, which will be reduced due to the vehicle body shape and the influence of the surrounding environment.

(3) Since the electrical key transmitter sub-assembly uses weak radio waves, strong radio waves or electrical noise in the frequency used by the electrical key transmitter sub-assembly may reduce the size of the operation area and the remote control may not function.

(4) When the transmitter battery is weak, the size of the operation area is reduced and the remote control may not function.

HINT:

• If the electrical key transmitter sub-assembly has been left in a place that is exposed to direct sunlight, such as on the instrument panel, it may cause the battery to be weakened or cause other related problems.
• Do not place the electrical key transmitter sub-assembly near magnetic equipment, such as digital audio players, induction cookers, medical devices that generate low-frequency electromagnetic waves, etc.

(c) Multi channel function

The wireless door lock control system has a multi channel function. Each time the switch on the electrical key transmitter sub-assembly is pressed, the channel is switched alternately between 2 different frequencies and the signal is sent to the electrical key and tire pressure monitoring system receiver assembly.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

• Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
• Inspect the fuses and relays related to this system before inspecting the suspected areas below.

• *1: w/ Cornering Light
• *2: w/o Cornering Light

System Diagram

SYSTEM DIAGRAM

WIRELESS DOOR LOCK CONTROL SYSTEM

POWER DOOR LOCK CONTROL SYSTEM

Click here

Terminals Of Ecu

TERMINALS OF ECU

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

(b) Measure the resistance according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connectors connected.

(c) Reconnect the instrument panel junction block assembly connectors.

(d) Measure the voltage and resistance according to the value(s) in the table below.

(e) Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.

Click here

(f) Measure the voltage and check for pulses according to the value(s) in the table below.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

(c) Reconnect the G40 certification ECU (smart key ECU assembly) connector.

(d) Check for pulses according to the value(s) in the table below.

(e) Using an oscilloscope, check waveform 1.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

(f) Using an oscilloscope, check waveform 2.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.