Diagnostic Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 GMC C3500 HD, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. 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 7 times, inspect vehicle for damage to wiring system, visible body damage, faulty or intermittent electrical connections or addition of aftermarket devices which could affect SIR operation. Diagnose AIR BAG warning light malfunction. See AIR BAG WARNING LIGHT CIRCUIT MALFUNCTION .
- 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 and repair data link communication circuits.
- If scan tool communicates with SDM, go to next step. If scan tool does not communicate with SDM, inspect and repair data link communications circuits.
- Using scan tool, request SIR DTC display. If scan tool displays history or current SIR DTC's, go to next step. If scan tool does not display any SIR DTC's, system is okay.
- If scan tool displays any DTC's that begin with "U", inspect and repair applicable data link communication circuits and components. If no DTC's are displayed that begin with "U", go to next step.
- If scan tool displays DTC B1000, go to DTC B1000: SDM MALFUNCTION . If scan tool displays other DTC's, diagnose and repair applicable SIR 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 resistance high |
| B0018 | Passenger deployment loop voltage short to ground or voltage |
| B0022 | Driver deployment loop resistance low |
| B0024 | Driver deployment loop short to ground or voltage |
| B0026 | Driver deployment loop resistance high |
| B0035 | Front end discriminating sensor closed or short to ground |
| B0036 | Front end discriminating sensor open or short to ground |
| B0051 | Deployment commanded |
| B0053 | Deployment commanded with loop malfunction |
| B0077 | EFS valid identification message not received |
| B0079 | EFS identification not correct |
| B0080 | EFS NOK message |
| B0090 | Air bag module switch voltage out of range |
| B0091 | Air bag module switch wrong state |
| B1000 | SDM malfunction |
| B1001 | Option configuration error |