Light Control Switch Circuit Description

The main 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 main 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.


Flasher Toyota Sequoia 2011
Fig. 28: Light Control Switch Circuit - Wiring Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.


When using the intelligent tester, start the inspection from step 1 and when not using the intelligent tester, start from step 2.

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