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.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 458 (BODY CONTROL SYSTEM)DESCRIPTION & OPERATIONBODY CONTROL SYSTEM DESCRIPTION AND OPERATIONINTERIOR LIGHTING
1999 GMC Forward Control 5.7 R, Automatic
Interior Lighting
1999 GMC Forward Control 5.7 R, AutomaticSECTION Interior Lighting
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
The BCM provides the following interior lighting functions. Some interior control functions may be controlled by other systems through the class 2 serial data link:
- Interior illumination control
- Backlight/Illumination
- Delayed illumination
- Illumination on key cylinder unlock
- Exit illumination
- Illumination after air bag deployment
- Keyless entry unlock illumination
- Interior lighting personalization
Refer to INTERIOR LIGHTING SYSTEMS DESCRIPTION AND OPERATION .
RENDER: 1.0x
NO RELATED
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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.