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 743 (SEAT 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.
BCM Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition On and Engine Off / Doors, Hatch or Trunk, and Hood Closed / No Switches On / Vehicle in Park or Neutral | |||
| Current Power Mode | Input Data 1 | Power Mode | Run |
| Driver Door Ajar Switch | Input Data 2 | Open/Closed | Closed |
| Ignition 1 | Input Data 1 | On/Off | On |
| Ignition 2 | Input Data 1 | On/Off | On |
| Ignition 3 | Input Data 1 | On/Off | On |
| Key In Ignition | Input Data 1 | Active/Inactive | Active |
| Key Out of Ignition | Input Data 1 | Active/Inactive | Inactive |
LDCM Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition On and Engine Off / Doors, Hatch or Trunk, and Hood Closed / No Switches On / Vehicle in Park or Neutral | |||
| Door Ajar | Inputs | Closed/Ajar | Closed |
| Memory 1 Select Switch | Inputs | Active/Inactive | Inactive |
| Memory 2 Select Switch | Inputs | Active/Inactive | Inactive |
SCM Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Ignition On and Engine Off / Doors, Hatch or Trunk, and Hood Closed / No Switches On / Vehicle in Park or Neutral | |||
| Battery 1 | Data 1 | 0-26 Volts | Varies |
| Battery 2 | Data 1 | 0-26 Volts | Varies |
| Calibration ID | Module Info | Calibration Number | Varies |
| Forward Position Motor Stop | Data 2 | Volts | 0-5 Volts |
| Front Down Position Motor Stop | Data 2 | Volts | 0-5 Volts |
| Front Up Position Motor Stop | Data 2 | Volts | 0-5 Volts |
| Front Vertical Position | Data 2 | Counts | 0-255 |
| Horizontal Position | Data 2 | Counts | 0-255 |
| Memory 1 Fore/Aft Motor Position | Data 2 | Volts | 0-5 Volts |
| Memory 1 Front Vertical Motor Position | Data 2 | Volts | 0-5 Volts |
| Memory 1 Rear Vertical Motor Position | Data 2 | Volts | 0-5 Volts |
| Memory 2 Fore/Aft Motor Position | Data 2 | Volts | 0-5 Volts |
| Memory 2 Front Vertical Motor Position | Data 2 | Volts | 0-5 Volts |
| Memory 2 Rear Vertical Motor Position | Data 2 | Volts | 0-5 Volts |
| Memory 3 Fore/Aft Motor Position | Data 2 | Volts | 0-5 Volts |
| Memory 3 Front Vertical Motor Position | Data 2 | Volts | 0-5 Volts |
| Memory 3 Rear Vertical Motor Position | Data 2 | Volts | 0-5 Volts |
| Position Sensor Reference | Data 1 | 0-26 Volts | Varies |
| Rear Down Position Motor Stop | Data 2 | Volts | 0-5 Volts |
| Rear Up Position Motor Stop | Data 2 | Volts | 0-5 Volts |
| Rear Vertical Position | Data 2 | Counts | 0-255 |
| Reverse Position Motor Stop | Data 2 | Volts | 0-5 Volts |
| ROM ID | Module Info | ID Number | Varies |
| Seat Forward Switch | Inputs | Active/Inactive | Inactive |
| Seat Front Down Switch | Inputs | Active/Inactive | Inactive |
| Seat Front Up Switch | Inputs | Active/Inactive | Inactive |
| Seat Motor Current | Data 1 | 0-52.7 Amps | Varies |
| Seat Rear Down Switch | Inputs | Active/Inactive | Inactive |
| Seat Rear Up Switch | Inputs | Active/Inactive | Inactive |
| Seat Reverse Switch | Inputs | Active/Inactive | Inactive |
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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.