Toyota 4Runner: System Diagram

Toyota 4Runner Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Manual 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	OFF operation switch signal	LIN
		A/C switch signal
		Rear defogger operation switch signal
		Mode operation switch signal
		REC/FRS switch signal
		Set temperature switch signal
		Blower operation switch signal

*: w/ PTC Heater

System Description

SYSTEM DESCRIPTION 1. GENERAL (a) The air conditioning system has the following controls. Control Outline Manual Control The air conditioning ampli ...

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 ...

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