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 728 (WIRING SYSTEMS - SPECIFICATIONS, COMPONENT VIEWS AND CONNECTOR END VIEWS)DIAGNOSTIC INFORMATION AND PROCEDURESPASSENGER CAR ZONING
1999 GMC Forward Control 5.7 R, Automatic
Passenger Car Zoning
1999 GMC Forward Control 5.7 R, AutomaticSECTION Passenger Car Zoning
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
All grounds, in-line connectors, pass-through grommets, and splices have identifying numbers that correspond to where they are located in the vehicle. The following table explains the numbering system.
Vehicle Zoning Table
| Callout Numbers | Zone Description |
|---|---|
| 100-199 | Engine compartment- All forward of the dash panel Note: 001-099 are additional for the engine compartment - ONLY to be used if all 100-199 items are used |
| 200-299 | Within the instrument panel area |
| 300-399 | Passenger compartment - From the instrument panel to the rear wheelhouse |
| 400-499 | Luggage compartment - From the rear wheelhouse to the rear of the vehicle |
| 500-599 | Within the left front door |
| 600-699 | Within the right front door |
| 700-799 | Within the left rear door |
| 800-899 | Within the right rear door |
| 900-999 | Within the luggage compartment lid or hatch |
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.