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 723 (BATTERY, CHARGING SYSTEM & STARTING SYSTEM)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 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Body Control Module (BCM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF | |||
| Battery Volts | Data | Volts | 12.6 Volts |
| Inadvertent Load Monitor | Input Data 1 | Active/Inactive | Active |
Powertrain Control Module (PCM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF | |||
| GEN F-Terminal Signal | Engine Data 2 | % | 0% |
| GEN L-Terminal Signal | Engine Data 2 | Voltage/No Voltage | Voltage |
| Ignition 1 Signal | Engine Data 1, Engine Data 2 | Volts | 12.6 Volts |
Seat Control Module (SCM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition ON/Engine OFF | |||
| Battery Volts | Data | Volts | 12.6 Volts |
| Inadvertent Load Monitor | Input Data 1 | Active/Inactive | Active |
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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.