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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 533 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2628: DISPLAY DIMMING PULSE WIDTH MODULATION (PWM) OUTPUT CIRCUIT HIGHCIRCUIT DESCRIPTION
1999 GMC Forward Control 5.7 R, Automatic
Circuit Description
1999 GMC Forward Control 5.7 R, AutomaticSECTION Circuit Description
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
The BCM controls the illumination of the following lamps through pulse width modulation when the park lamps or the headlamps are ON:
- The automatic transmission control position illumination lamp
- The left glass window release switch illumination lamp
- The electronic traction control switch illumination lamp
- The door lock theft deterrent defeat switch illumination lamp
- The heater A/C control switch illumination lamp
- The instrument cluster illumination lamps
- The headlamp switch illumination lamp
- The radio switches illumination lamps
- The driver information display switch illumination lamp
- The heated seat switch illumination lamp
- The door lock switches illumination lamps
- The window switches illumination lamps
- The steering wheel controls illumination lamps
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.