Air Conditioning Control Panel Circuit

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: Air Conditioning Control Panel Circuit
- Air Conditioning Control Panel Circuit

DESCRIPTION

This circuit consists of the A/C control assembly and A/C amplifier. When the A/C control assembly is operated, signals are transmitted to the A/C amplifier through the LIN communication system.

If the LIN communication system malfunctions, the A/C amplifier does not operate even if the A/C control assembly is operated.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (A/C CONTROL ASSEMBLY - BODY GROUND)

(a) Disconnect the A/C control assembly connector.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (A/C CONTROL ASSEMBLY - BATTERY)

(a) Measure the voltage according to the value(s) in the table below.





Standard Voltage:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C CONTROL ASSEMBLY)

(a) Disconnect the A/C amplifier connector.





(b) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. REPLACE A/C CONTROL ASSEMBLY

(a) Replace the A/C control assembly with a known good one and check if the same problem occurs again Removal.

OK:

Same problem does not occur.

NG -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System

OK -- END (A/C CONTROL ASSEMBLY WAS DEFECTIVE)