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 551 (BODY REAR END)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LIST
1999 GMC Forward Control 5.7 R, Automatic
Scan Tool Data List
1999 GMC Forward Control 5.7 R, AutomaticSECTION Scan Tool Data List
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.
Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF/Vehicle in PARK | |||
| LH Lift Glass Ajar Switch | Input | Active/Inactive | Inactive |
| Lift Glass Relay | Output | On/Off | Off |
| Liftgate Ajar Switch | Input | Active/Inactive | Inactive |
| Liftgate Key Cyl. Unlk. Sw. | Input | Active/Inactive | Inactive |
| Liftgate Lock Motor | Output | On/Off | Off |
| Liftgate Open Switch | Input | Active/Inactive | Inactive |
| Liftgate Unlock Motor | Output | On/Off | Off |
| RH Lift Glass Ajar Switch | Input | Active/Inactive | Inactive |
| Rear Release Switch | Input | Active/Inactive | Inactive |
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.