Toyota Avalon Service & Repair Manual: System Description

SYSTEM DESCRIPTION

COMMUNICATION SYSTEM FUNCTION

(a) The air conditioning amplifier assembly communicates with each ECU via CAN communication and LIN communication. Additionally, the air conditioning amplifier assembly sends operation signals to each damper servo motor and receives damper position information and sensor information from the damper servo motors and No. 1 cooler thermistor through the air conditioning harness assembly.

Air Conditioning Amplifier Assembly ←→ Airbag ECU Assembly

Receiver

Sender

Signal

Communication Line

Air conditioning amplifier assembly

Airbag ECU assembly

Front passenger seat belt buckle switch status signal

CAN

Front passenger seat occupant status signal

Air Conditioning Amplifier Assembly ←→ Main Body ECU (Multiplex Network Body ECU)

Receiver

Sender

Signal

Communication Line

Air conditioning amplifier assembly

Main body ECU (multiplex network body ECU)

Auto dimmer signal

CAN

Front passenger door courtesy switch signal

Rear right door courtesy switch signal

Rear left door courtesy switch signal

High beam headlight request signal

Low beam headlight request signal

Destination symbol signal

Country code 1st signal

Country code 2nd signal

Country code 3rd signal

Steering wheel signal

Solar data (R) signal

Solar data (L) signal

Main body ECU (multiplex network body ECU)

Air conditioning amplifier assembly

Rear defogger drive request signal

CAN

Ambient temperature display signal

Air Conditioning Amplifier Assembly ←→ Power Steering ECU (Rack and Pinion Power Steering Gear Assembly)

Receiver

Sender

Signal

Communication Line

Air conditioning amplifier assembly

Power steering ECU (rack and pinion power steering gear assembly)

Loading control level signal

CAN

Power steering ECU (rack and pinion power steering gear assembly)

Air conditioning amplifier assembly

Ambient temperature display signal

CAN

Air Conditioning Amplifier Assembly ←→ Combination Meter Assembly

Receiver

Sender

Signal

Communication Line

Air conditioning amplifier assembly

Combination meter assembly

Vehicle speed signal (meter to other)

CAN

Temperature unit signal (centigrade/fahrenheit)

Combination meter assembly

Air conditioning amplifier assembly

Ambient temperature display signal

CAN

Ambient temperature display whole number/decimal (0/0.5°C) signal

Air Conditioning Amplifier Assembly ←→ Air Conditioning Control Panel (Radio and Display Receiver Assembly)

Receiver

Sender

Signal

Communication Line

Air conditioning amplifier assembly

Air conditioning control panel (radio and display receiver assembly)

AUTO switch state signal

CAN

Rear defogger switch state signal

Air outlet switch state signal

OFF switch state signal

A/C switch state signal

SYNC switch state signal

Mode switch state signal

Blower up switch state signal

Blower down switch state signal

Driver side TEMP up switch state signal

Driver side TEMP down switch state signal

Front passenger side TEMP up switch state signal

Front passenger side TEMP down switch state signal

Blower level switch state signal 1

Blower level switch state signal 2

Blower level switch state signal 3

Blower level switch state signal 4

Blower level switch state signal 5

Blower level switch state signal 6

Blower level switch state signal 7

Driver side seat speech recognition operation mode information signal

Driver side seat speech recognition data addition subtraction information signal

Driver side seat speech recognition temperature directions data signal

Front passenger side seat speech recognition operation mode information signal

Front passenger side seat speech recognition data addition subtraction information signal

Front passenger side seat speech recognition temperature directions data signal

AVN1S39 valid information

Independent A/C control information signal

LIN

AUTO composite switch operation signal

AUTO switch operation signal

OFF switch operation signal

A/C switch operation signal

Blower switch operation signal

Air outlet mode switch operation signal

Front defroster switch operation signal

Rear defogger switch operation signal

SYNC switch operation signal

Driver side temperature setting signal

Front passenger side temperature setting signal

Front right seat heater switch signal

Front left seat heater switch signal

Existence of seat AUTO function signal

Existence of seat ventilator/heater function signal

Part number information 1 signal

Part number information 2 signal

Part number information 3 signal

Part number information 4 signal

Part number information 5 signal

Air conditioning control panel (radio and display receiver assembly)

Air conditioning amplifier assembly

A/C display request signal

CAN

AUTO indicator signal

Rear defogger indicator signal

A/C indicator signal

SYNC indicator signal

Blower level indicator signal

Outlet AUTO indicator signal

Outlet indicator signal

Blower manual status signal

Blower customize indicator signal

A/C on-screen request signal

Driver side temperature display signal

Front passenger side temperature display signal

A/C screen select information signal

Switch design DUAL/SYNC. Select information signal

Temperature unit select information signal

Blower step select information signal

Speech recognition level information signal

Destination select information signal

Control information status signal

Ambient temperature display signal

Ambient temperature display whole number/decimal (0/0.5°C) signal

ECO mode indicator signal

LIN

Entire front panel display instruction signal

AUTO indicator signal

Blower level indicator signal

Recirculation indicator signal

Air outlet mode display signal

Rear defogger indicator signal

SYNC indicator signal

Driver side temperature setting display signal

Front passenger side temperature setting display signal

Dimmer signal

A/C indicator signal

Front right seat heater indicator signal

Front left seat heater indicator signal

Air Conditioning Amplifier Assembly ←→ ECM

Receiver

Sender

Signal

Communication Line

Air conditioning amplifier assembly

ECM

Drive mode select signal

CAN

Engine type information signal 1

Engine type information signal 2

Engine type information signal 3

Engine type information signal 4

Engine speed data signal

Alternative field duty value signal

Engine coolant temperature signal

A/C control cut-off signal 1

A/C control cut-off signal 2

A/C control cut-off signal 3

A/C control cut-off signal 4

A/C control cut-off signal 5

Variable control inhibition signal

Compulsory internal air circulation at high coolant temperature command signal

ECM

Air conditioning amplifier assembly

Magnet clutch request signal

CAN

A/C idle up request signal

ECO switch information signal

Heater idle up request signal

Charging control inhibit signal

Prior A/C control request signal

Acceleration cut inhibit signal

Generator control inhibit signal

Request control by refrigerant signal

Ambient temperature before correction signal

Refrigerant information signal

Evaporator temperature sensor signal

Variable compressor solenoid current signal

Air conditioner pressure sensor signal

Air Conditioning Amplifier Assembly ←→ DCM (Telematics Transceiver) (w/ Manual (SOS) Switch)

Receiver

Sender

Signal

Communication Line

Air conditioning amplifier assembly

DCM (telematics transceiver)

Remote engine start system control signal

CAN

Defogger control signal

Air conditioner control signal

DCM (telematics transceiver)

Air conditioning amplifier assembly

Drive recorder ACN01 signal

CAN

Drive recorder ACN02 signal

Drive recorder ACN03 signal

Drive recorder ACN04 signal

Drive recorder ACN05 signal

Drive recorder ACN06 signal

Drive recorder ACN07 signal

Drive recorder ACN08 signal

In-vehicle temperature signal

Ambient temperature display signal

A/C control state signal

Air Conditioning Amplifier Assembly ←→ Damper Servo

Receiver

Sender

Signal

Communication Line

Air conditioning amplifier assembly

No. 1 air conditioning radiator damper servo sub-assembly

Damper position signal

LIN

No. 2 air conditioning radiator damper servo sub-assembly

No. 1 blower damper servo sub-assembly

No. 1 air conditioning radiator damper servo sub-assembly

Air conditioning amplifier assembly

No. 2 air conditioning radiator damper servo sub-assembly

No. 1 blower damper servo sub-assembly

Air Conditioning Amplifier Assembly ←→ Blower Motor, Sensor, Switch, etc.

Receiver

Sender

Signal

Communication Line

Air conditioning amplifier assembly

Cooler (room temp. sensor) thermistor

Sensor value signal

Direct line

Thermistor assembly

Air conditioner pressure sensor

No. 1 cooler thermistor

Magnet clutch assembly

Operation signal

ECO switch assembly (electric parking brake switch assembly)

ECO switch signal

Blower motor with fan sub-assembly

Air conditioning amplifier assembly

Drive signal

Direct line

Cooler compressor assembly

Magnetic clutch relay

    Recirculated/Fresh Air Modes Switch without User Input

    System Diagram

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