Toyota 4Runner: System Diagram

Toyota 4Runner Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / System Diagram

SYSTEM DIAGRAM

Communication Table

Transmitter	Receiver	Signal	Communication Line
Air conditioning amplifier assembly	ECM	A/C idle up request signal	CAN
		Heater idle up request signal
		PTC heater control request signal*
		Electricity load at low voltage state signal
		Ambient temperature signal
Main body ECU	Air conditioning amplifier assembly	Main body request signal
Combination meter assembly	Air conditioning amplifier assembly	Vehicle speed signal
ECM	Air conditioning amplifier assembly	Engine coolant temperature signal
		Engine speed data
		Engine type information signal
Heater control assembly	Air conditioning amplifier assembly	AUTO operation switch signal	LIN
		OFF operation switch signal
		A/C switch signal
		Front defroster operation switch signal
		Rear defogger operation switch signal
		Mode operation switch signal
		REC/FRS switch signal
		Set temperature switch signal
		Blower operation switch signal (up, down)

*: w/ PTC Heater

System Description

SYSTEM DESCRIPTION 1. GENERAL (a) The air conditioning system has the following controls. Control Outline Neural Network Control This control is ca ...

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the air conditioning system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO W ...

Other materials about Toyota 4Runner:

Removal
REMOVAL PROCEDURE 1. DRAIN ENGINE COOLANT (a) Drain engine coolant (See page ). 2. REMOVE RADIATOR ASSEMBLY (a) Remove the radiator assembly (See page ). 3. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM 4. DISCONNECT DISCHARGE HOSE SUB-ASSEMBLY ...

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. REMOVE FRONT WHEEL 2. DISCONNECT FRONT DISC BRAKE CYLINDER ASSEMBLY LH 3. REMOVE FRONT DISC 4. REMOVE FRONT AXLE HUB GREASE CAP 5. INSPECT FRONT AXLE HUB BEARING LOOSENESS (a) Using a dial indicator ...