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 7 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)
1999 GMC Forward Control 5.7 R, Automatic
Section 7 (Supplemental Inflatable Restraint System)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 7 (Supplemental Inflatable Restraint System)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1996 GMC Vandura Special, 1996 GMC Vandura, 1996 GMC Savana Special, 1996 GMC Savana Camper Special, and 1996 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.
- Connector Identification
- Diagnosis & Testing
- Diagnostic Charts
- Sir Diagnostic System Check
- Chart A - Inflatable Restraint Control Module Integrity Check
- Chart B - Air Bag Warning Light Comes On Steady
- Chart C - Air Bag Warning Light Does Not Come On
- DTC 15 - Passenger-Side Deployment Loop Resistance High
- DTC 16 - Passenger-Side Deployment Loop Resistance Low
- DTC 17 - Passenger-Side Deployment Loop Open
- DTC 18 - Passenger-Side Deployment Loop Short To Ground
- DTC 19 - Passenger-Side Deployment Loop Short To Voltage
- DTC 21 - Driver-Side Deployment Loop Resistance High
- DTC 22 - Driver-Side Deployment Loop Resistance Low
- DTC 24 - Driver-Side Deployment Loop Short To Ground
- DTC 25 - Driver-Side Deployment Loop Short To Voltage
- DTC 26 - Driver-Side Deployment Loop Open
- DTC 35 - Discriminating Sensor Circuit Closed Or Short To Ground
- DTC 36 - Discriminating Sensor Circuit Open Or Short To
- DTC 51 - Deployment Commanded
- DTC 53 - Deployment Commanded With Loop Fault Present
- DTC 61 - Air Bag Warning Light Circuit Failure
- DTC 71 - Internal Inflatable Restraint Control Module Failure
- Post-Collision Air Bag Safety Inspection
- Description & Operation
- Service Precautions
- Disabling & Activating Air Bag System
- Post-Collision Inspection
- Adjustments
- Disposal Procedures
- Removal & Installation
- System Operation Check
- Wire Repair
- Torque Specifications
- Wiring Diagrams
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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.