Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System Description: Outline
The auto light control system uses an optical sensor that detects outside brightness.
When the lighting switch is in "AUTO" position, it automatically turns on/off the parking lamps and the headlamps in accordance with the ambient light. Sensitivity can be adjusted in four steps. For the details of the setting, refer to , "SETTING CHANGE FUNCTIONS".
Optical sensor ground is supplied
- from BCM (body control module) terminal 18
- to optical sensor terminal 3.
When ignition switch is turned to "ON" position and when outside brightness is darker than prescribed level, input is supplied
- to BCM (body control module) terminal 58
- from optical sensor terminal 4.
The headlamps will then illuminate. For a description of headlamp operation, refer to SYSTEM DESCRIPTION
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.