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 812 (LIGHTING SYSTEMS)
1999 GMC Forward Control 5.7 R, Automatic
Section 812 (Lighting Systems)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 812 (Lighting Systems)
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Lighting Systems
- Diagnostic System Check - Lighting Systems
- Diagnostic Trouble Code (DTC) List
- DTC 002
- DTC 003
- Symptoms - Lighting Systems
- Backup Lamps Always On
- Backup Lamps Inoperative
- Courtesy Lamps Always On
- Courtesy Lamps Inoperative
- Daytime Running Lamps (DRL) Inoperative
- Fog Lamp Indicator Inoperative
- Fog Lamps Always On
- Fog Lamps Inoperative
- Hazard Lamps Inoperative
- Headlamps Always On - Low or High Beam
- Headlamps Inoperative - Low Beams
- Headlamps Inoperative - High Beams
- Headlamps Inoperative - Low and High Beams
- Headlamps Inoperative - Flash to Pass
- High Beam Indicator Inoperative
- Interior Backlighting Does Not Dim
- Interior Backlighting Inoperative
- IP Compartment Lamp Inoperative
- IP Compartment Lamp Always On
- Park Lamps Always On
- Park Lamps Inoperative
- Rear Compartment Lamp(s) Inoperative
- Stop Lamps Always On
- Stop Lamps Inoperative
- Turn Signal Lamps and/or Indicators Inoperative
- Vanity Mirror Lamp(s) Always On
- Vanity Mirror Lamp(s) Inoperative
- Repair Instructions
- Headlamp Switch Replacement
- Fog Lamp Switch Replacement - Front
- Daytime Running Lamps (DRL) Ambient Light Sensor Replacement
- Daytime Running Lights (DRL) Control Module Replacement
- Hazard and Turn Signal Flasher Replacement
- Ashtray Lamp Bulb Replacement
- Driver Information Center (DIC) Bulb Replacement
- Courtesy Lamp Replacement - Instrument Panel
- Courtesy Lamp Replacement - Overhead Console
- IP Compartment Lamp Switch Replacement
- IP Compartment Lamp Bulb Replacement
- Vanity Mirror Lamp Replacement
- Trans Floor Shift Control Indicator Lamp Replacement
- Headlamp Assembly or Headlamp Bulb Replacement
- Headlamp Capsule Replacement
- Headlamp Aiming
- Fog Lamp Replacement - Front
- Fog Lamp Aiming Procedure
- Park/Turn Signal Lamp Bulb Replacement
- High Mounted Stop Lamp Replacement
- High Mounted Stop Lamp Bulb Replacement
- License Lamp Replacement
- Tail Lamp Assembly and/or Backup, Side marker, Stop, Turn Signal Bulb Replacement
- Roof Side Rail Lamp Replacement (Coupe)
- Roof Side Rail Lamp Replacement (Sedan)
- Rear Compartment Lamp Replacement
- Description and Operation
RENDER: 1.0x
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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.