Diesel Data: Automotive Repair

Light Control Switch Circuit








LIGHTING (EXT): LIGHTING SYSTEM: Light Control Switch Circuit

Light Control Switch Circuit

DESCRIPTION

The daytime running light relay receives the following signals:

- Light control switch TAIL or HEAD signal

- Dimmer switch HIGH or HIGH FLASH (PASS) signal

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY
(a) Inspect the headlight dimmer switch assembly Testing and Inspection.
OK:
Headlight dimmer switch assembly is normal.
NG -- REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (SWITCH - DAYTIME RUNNING LIGHT RELAY)
(a) Disconnect the E12 headlight dimmer switch assembly connector.
(b) Disconnect the E42 daytime running light relay 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 CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE