Seat Belt Indicator Malfunction - Driver
Seat Belt Indicator Malfunction - Driver
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The driver seat belt switch is a 2-wire switch wired to the Inflatable Restraint Sensing and Diagnostic Module (SDM) using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The Inflatable Restraint Sensing and Diagnostic Module sends the status of the driver seat belt via serial data to the instrument panel cluster. After receiving the message, the instrument panel cluster controls the illumination of the driver seat belt indicator.
Reference Information
Schematic Reference
Seat Belt Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Outside Rearview Mirror - Driver
Description and Operation
Seat Belt System Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Verify the driver seat belt indicator turns ON and OFF when commanding the instrument cluster all indicators ON and OFF with a scan tool.
• If the driver seat belt indicator does not turn ON and OFF as commanded.
Replace the P16 instrument cluster.
• If the driver seat belt indicator does turn ON and OFF as commanded
2. Verify the scan tool Diver Seat Belt Switch parameter changes between Buckled and Unbuckled when buckling and unbuckling the driver seat belt.
• If the parameter does not change
Refer to Circuit/System Testing.
• If the parameter changes
3. All OK.
Circuit/System Testing
Note: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
* B88D Seat Belt Switch-Driver
* Seat belt switch harness connector
* K36 Inflatable Restraint Sensing and Diagnostic Module
* Inflatable Restraint Sensing and Diagnostic Module wiring harness connector
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B88D seat belt switch-driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground.
• If 5 ohms or greater
1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. Test for less than 2 ohms in each low reference circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If less than 5 ohms
3. Ignition ON.
4. Verify the scan tool Driver Seat Belt Status parameter is Buckled.
• If the parameter is not Buckled
1. Ignition OFF, disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. Test for infinite resistance between the seat belt switch signal circuit terminal 1 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If the parameter is Buckled
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
6. Verify the scan tool Driver Seat Belt Status parameter is Unbuckled.
• If the parameter is not Unbuckled
1. Ignition OFF, disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in each circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If the parameter is Unbuckled
7. Test or replace the B88D Seat Belt Switch-Driver.
Component Testing
1. Ignition OFF, disconnect the harness connector at the B88D Seat Belt Switch-Driver, buckle the driver seat belt.
2. Test for infinite resistance between the signal circuit terminal 1 and the low reference terminal 2.
• If not infinite resistance
Replace the B88D Seat Belt Switch-Driver.
• If infinite resistance
3. Unbuckle the driver seat belt.
4. Test for less than 1 ohms between the signal circuit terminal 1 and the low reference terminal 2.
• If 1 ohms or greater
Replace the B88D Seat Belt Switch-Driver.
• If less than 1 ohms
5. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Front Seat Belt Buckle Replacement Front Seat Belt Buckle Replacement
* Control Module References Control Module References for Inflatable Restraint Sensing and Diagnostic Module or instrument panel cluster replacement, programming and setup