Headlight (Hi-Beam) Circuit

LIGHTING: LIGHTING SYSTEM: Headlight (HI-BEAM) Circuit
- Headlight (HI-BEAM) Circuit

DESCRIPTION

* When both of the following conditions are met, the high beam headlights will come on.

* Low beam headlights are turned on by the automatic light control or manual light control.

* Dimmer switch is in HIGH position.

* The running light relay assembly dims the high beam headlights when operating them as daytime running lights.

* When the dimmer switch is turned to the HIGH FLASH position, the high beam headlights will come on.

HINT
* If only a high beam headlight on one side does not illuminate, inspect the fuse, bulb, or wire harness that is related to the bulb.
* Before performing troubleshooting of the high beam headlight control, check that the low beam headlight operates normally.

WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. INSPECT HEADLIGHT DIMMER RELAY (DIM)

(a) Remove the headlight dimmer 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 HEADLAMP DIMMER RELAY
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT DIMMER RELAY)

(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 (HEADLIGHT DIMMER 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 -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - HEADLIGHT ASSEMBLY)

(a) Disconnect the A26 headlight assembly LH and A25 headlight assembly RH connector.





Text in Illustration





(b) 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.

5. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - 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