Headlight Relay Circuit

LIGHTING: LIGHTING SYSTEM: Headlight Relay Circuit
- Headlight Relay Circuit

DESCRIPTION

* The running light relay assembly receives the light control switch HEAD signal and the ambient light level signal from the automatic light control sensor to control the headlight (H-LP) relay.

HINT
* If only a low beam headlight bulb on one side does not illuminate, inspect the bulb, fuse, or wire harness related to the bulb.

WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. INSPECT ENGINE ROOM RELAY BLOCK

(a) Remove the H-LP LH LO fuse and H-LP RH LO fuse from the engine room relay block.





(b) Measure the voltage between the loading slot of each fuse and body ground.

Standard Voltage:





Text in Illustration





NG -- INSPECT HEADLIGHT RELAY (H-LP)

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND)

2. INSPECT HEADLIGHT RELAY (H-LP)

(a) Remove the H-LP relay from the engine room relay block.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE H-LP RELAY
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (BATTERY - H-LP RELAY)

(a) Measure the voltage on the relay block side 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.

4. CHECK HARNESS AND CONNECTOR (H-LP RELAY - FUSE)

(a) 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.

5. CHECK HARNESS AND CONNECTOR (H-LP RELAY - RUNNING LIGHT RELAY ASSEMBLY)

(a) Disconnect the C52 running light relay assembly connector.

(b) 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