Light Control Switch Circuit

LIGHT CONTROL SWITCH CIRCUIT

CIRCUIT DESCRIPTION

The body ECU detects the light control switch position and drives the DRL No. 4 and HEAD relays.

If the vehicle is equipped with an automatic light control system, the light control switch includes the AUTO position.

The body ECU turns the headlights ON and OFF based on the ambient light level outside the vehicle, which is detected by the automatic light control sensor.

Wiring Diagram:

Step 1 - 2:

Step 3:

INSPECTION PROCEDURE

HINT: When using the hand-held tester, start the inspection from step 1 and when not using the hand-held tester, start from step 2.