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 101 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC TESTSSIR DIAGNOSTIC SYSTEM CHECKDIAGNOSTIC PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic
Diagnostic Procedure
1999 GMC Forward Control 5.7 R, AutomaticSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
- Observe AIR BAG warning light when turning ignition on. If AIR BAG warning light flashes 7 times, go to next step. If AIR BAG warning light does not flash, inspect vehicle and easily accessible air bag system components for obvious damage, addition of aftermarket accessories, faulty or intermittent electrical connections or conditions which could cause malfunction. Diagnose air bag warning light problems. See AIR BAG WARNING LIGHT STAYS ON or AIR BAG WARNING LIGHT DOES NOT COME ON .
- Install scan tool to Data Link Connector (DLC), located under left side of instrument panel. If scan tool powers up, go to next step. If scan tool does not power up, inspect data link communications circuits.
- If scan tool communicates with SDM, go to next step. If scan tool does not communicate with SDM, inspect data link communications circuits.
- Using scan tool, request Diagnostic Trouble Codes (DTC's). If current or history DTC's exist, record DTC's. Go to next step. If no DTC's exist, system is okay at this time.
- If scan tool displays any "U" type DTC's, diagnose and repair other system DTC's before attempting SIR system repairs. If other DTC's are displayed, diagnose applicable DTC's. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| Trouble Code | Possible Cause |
|---|---|
| B0016 | Passenger deployment loop resistance low |
| B0017 | Passenger deployment loop open |
| B0018 | Passenger deployment loop short to ground or voltage |
| B0022 | Driver deployment loop resistance low |
| B0024 | Driver deployment loop short to ground or voltage |
| B0026 | Driver deployment loop open |
| B0035 | Discriminating sensor closed or short to ground |
| B0036 | Discriminating sensor open or short to voltage |
| B0051 | Deployment commanded |
| B0053 | Deployment commanded with loop malfunction |
| B1000 | SDM malfunction |
| B1001 | Option configuration error |
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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.