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 587 (HVAC SYSTEMS - MANUAL)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.
BCM Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON/Engine OFF | |||
| 8-Digit GM Part Number | Module Information | 8-Digit Alphanumeric | varies |
| A/C Switch | Inputs | Active/Inactive | varies |
PCM Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON/Engine OFF | |||
| A/C High Side Pressure | Engine Data 2 | kPa/psi | 420 kPa (61 psi) |
| A/C High Side Pressure | Engine Data 2 | volts | 0.8 volts |
| A/C Off For WOT | Engine Data 2 | Yes/No | No |
| A/C Pressure Disable | Engine Data 2 | Yes/No | No |
| A/C Relay Circuit Status | Output Driver Data | OK/Fault | OK |
| A/C Relay Command | Engine Data 1/Engine Data 2 | On/Off | Off |
| A/C Request Signal | Engine Data 2 | Yes/No | varies |
| ECT Sensor | Engine Data 1/Engine Data 2 | °C/°F | varies |
RENDER: 1.0x
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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.