Headlight Signal Circuit

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: Headlight Signal Circuit
- Headlight Signal Circuit

DESCRIPTION

The A/C amplifier receives headlight operational signals to determine the electrical load. The electrical load 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 if the headlights come on when the light control switch is turned to the HEAD position.

OK:

The headlights come on.

NG -- GO TO LIGHTING SYSTEM Exterior Lighting System
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (HEADLIGHT SIGNAL)

(a) Disconnect the connector from the A/C amplifier.





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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - DAYTIME RUNNING LIGHT RELAY ASSEMBLY)

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

3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - DAYTIME RUNNING LIGHT RELAY ASSEMBLY)

(a) Disconnect the connector from the daytime running light relay assembly.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal