Daytime Running Light Relay Circuit

LIGHTING: LIGHTING SYSTEM: Daytime Running Light Relay Circuit
- Daytime Running Light Relay Circuit

DESCRIPTION

This function is designed to automatically illuminate the headlights (dimmed high beams), during the daytime to make the car more visible to other vehicles.

The main body ECU and power distributor control this function. The main body ECU transmits a turn ON signal to the power distributor and the power distributor illuminates the high beams using a duty control.

The daytime running lights come on when the conditions given below are met:

* Ignition switch on (IG).

* Engine speed signal input (engine running condition).

* Parking brake switch is OFF.

* Light control switch is not in DRL OFF.

* Light control switch is in OFF, TAIL or AUTO position (and the headlights are not turned on via the automatic light control).

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HEADLIGHT

(a) Check the operation of high beam headlights.

OK:

High beam headlights operate normally.

NG -- GO TO PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
OK -- Continue to next step.

2. REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY

(a) Replace the engine room junction block assembly with a new or known good one.

(b) Check the operation of daytime running lights.

OK:

Daytime running lights operate normally.

NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures

OK -- END (ENGINE ROOM JUNCTION BLOCK WAS DEFECTIVE)