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 178 (BODY CONTROL SYSTEM)
1999 GMC Forward Control 5.7 R, Automatic
Section 178 (Body Control System)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 178 (Body Control System)
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Body Control System
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B1000: Internal Write Malfunction
- DTC B1004: KAM Has Been Reset
- DTC B1007: Data Mismatch
- DTC B1009: Memory Error
- DTC B1013: Memory Error
- DTC B1334: DOOR LOCKS Fuse Voltage Low
- DTC B1339: INADV POWER BUS/RAP Fuse Voltage Low
- DTC B1354: Ground 2 Error
- DTC B1422: Ignition Switch Voltage Error
- Symptoms - Body Control System
- Power Mode Mismatch
- Control Module References
- Repair Instructions
- Description and Operation
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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.