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 170 (BODY CONTROL MODULES)REMOVAL & INSTALLATIONONSTAR® MODULES (VCU, VIU & VCIM)REMOVAL (VEHICLE INTERFACE UNIT)
1999 GMC Forward Control 5.7 R, Automatic
Removal (Vehicle Interface Unit)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal (Vehicle Interface Unit)
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Vehicle Communication Unit (VCU) has a specific set of unique numbers that tie a module to each vehicle. 10-digit station identification and 11-digit electronic serial number are used by National Cellular Network and OnStar® to identify a specific vehicle. Because these numbers are tied to a vehicle identification number of a vehicle, these parts must never be exchanged with those of another vehicle.
- Remove TRUNK TRIM PANELS. See TRUNK TRIM PANELS .
- Pull upward on spring loaded snap connector to disconnect OnStar® GPS antenna coaxial cable (4) from OnStar® VIU. See Figure. Disconnect harness connectors.
- Remove VIU (5) by lifting retainer tabs (3). Remove VIU (5). VIU core must be returned for credit.
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.