Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: System Description

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Gasoline Model) / 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
Air conditioning amplifier assembly	Airbag ECU assembly	Front passenger seat occupant status signal	CAN

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
Main body ECU (multiplex network body ECU)	Air conditioning amplifier assembly	Ambient temperature display signal	CAN

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
Air conditioning amplifier assembly	Combination meter assembly	Temperature unit signal (centigrade/fahrenheit)	CAN
Combination meter assembly	Air conditioning amplifier assembly	Ambient temperature display signal	CAN
Combination meter assembly	Air conditioning amplifier assembly	Ambient temperature display whole number/decimal (0/0.5°C) signal	CAN

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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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: System Description

Recirculated/Fresh Air Modes Switch without User Input

System Diagram

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