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 43
- from optical sensor terminal 4.
The headlamps will then illuminate. For a description of headlamp operation, Refer to "SYSTEM DESCRIPTION ".
Use the Manual With the Right Hardware
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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.
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