Toyota 4Runner: Air Conditioning Control Panel does not Operate

Toyota 4Runner Service Manual / Power Source / Network / Networking / Lin Communication System / Air Conditioning Control Panel does not Operate

DESCRIPTION

When a switch of the air conditioning control assembly is operated, the air conditioning control assembly uses LIN communication to communicate with the air conditioning amplifier. If a switch of the air conditioning control assembly does not operate properly, a problem with the LIN communication between the air conditioning control assembly and air conditioning amplifier may be causing the malfunction.

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR CONDITIONING CONTROL)

(a) Disconnect the F42 air conditioning amplifier assembly connector.

(b) Disconnect the F29 air conditioning control assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F42-37 (LIN1) - F29-10 (LIN1)	Always	Below 1 Ω
F42-37 (LIN1) or F29-10 (LIN1) - Body ground	Always	10 kΩ or higher

Result

Result	Proceed to
OK (for Automatic Air Conditioning System)	A
OK (for Manual Air Conditioning System)	B
NG	C

Go to AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System)

Go to AIR CONDITIONING SYSTEM

REPAIR OR REPLACE HARNESS OR CONNECTOR

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