Air Conditioning Control Panel Does Not Operate

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): Air Conditioning Control Panel does not Operate

Air Conditioning Control Panel does not Operate

DESCRIPTION

This circuit consists of the air conditioning control and the air conditioning amplifier. When the air conditioning control is operated, signals are transmitted to the air conditioning amplifier through the LIN communication system.
If the LIN communication system malfunctions, the air conditioning amplifier does not operate even if the air conditioning control is operated.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (AIR CONDITIONING CONTROL ASSEMBLY - BODY GROUND)





(a) Disconnect the air conditioning control assembly connector.
(b) Measure the resistance of the wire harness side connector.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
2. CHECK WIRE HARNESS (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY)





(a) Disconnect the E23 air conditioning control assembly connector.
(b) Measure the voltage of the wire harness side connector.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - AIR CONDITIONING CONTROL)





(a) Disconnect the E23 control connector.
(b) Disconnect the E37 amplifier connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
4. REPLACE AIR CONDITIONING CONTROL ASSEMBLY
(a) Replace the air conditioning control with a new or properly functioning one.
(b) Operate the air conditioning control to check that it functions properly.
Result:






B -- END (AIR CONDITIONING CONTROL ASSEMBLY IS FAULTY)
A -- REPLACE AIR CONDITIONING AMPLIFIER