Headlight Signal Circuit (from 07/2011)

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Hatchback): Headlight Signal Circuit
- Headlight Signal Circuit

DESCRIPTION

The air conditioning amplifier assembly receives headlight operational signals to determine electrical load conditions. The electrical load condition signals are used for controlling the number of the PTC heater elements to be heated.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT HEADLIGHT ASSEMBLY

(a) Check that the headlight comes on when the light control switch is turned to the HEAD position.

OK:

The headlight comes on.

Result





B -- CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

C -- CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

A -- GO TO LIGHTING SYSTEM How To Proceed With Troubleshooting (from 07/2011)

2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the 3A instrument panel junction block assembly connector.

(b) Disconnect the D130 air conditioning amplifier assembly connector.

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

Standard Resistance:





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

3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

(b) Remove the main body ECU from the instrument panel junction block assembly.

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





Text in Illustration





Standard Resistance:





NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the D106 headlight dimmer switch assembly connector.

(b) Disconnect the D130 air conditioning amplifier assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures