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.
Typical Scan Tool Data
Circuit/System Description
The inflatable restraint sensing and diagnostic module (SDM) communicates the status of the driver seat belt switch to the instrument panel cluster. When the ignition switch is turned ON, with the driver seat occupied and the driver seat belt is unbuckled, the inflatable restraint sensing and diagnostic module sends a message to the instrument panel cluster to illuminate the fasten safety belt indicator for 72 seconds or until the seat belt is fastened. If the seat belt is buckled before the ignition switch is turned ON, the fasten safety belt indicator will remain OFF. When the seat belt is unbuckled, the seat belt switch is Closed. When the seat belt is buckled, the seat belt switch is Open.
Reference Information
Schematic Reference
Seat Belt Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (DH6)
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. Ignition ON, with a scan tool command the instrument cluster indicators ON and OFF. The driver seat belt indicator should turn ON and OFF when changing between the commanded states.
• If the seat belt indicator is always OFF, replace the instrument cluster.
2. Ignition ON, with the driver seat occupied, buckle and unbuckle the driver seat belt. The driver seat belt indicator should go ON and OFF while buckling and unbuckling the driver seat belt.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the driver seat belt buckle.
2. Test for less than 5 ohms between the ground circuit terminal B and ground.
• If 5 ohms or greater
1. Disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module.
2. Test for less than 2 ohms in each control 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 listed below is Buckled.
• If the scan tool Driver Seat Belt Status parameter does not display Buckled
1. Disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module.
2. Test for infinite resistance between the seat belt switch signal circuit terminal 2 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If less infinite resistance, replace the K36 inflatable restraint sensing and diagnostic module.
• If the scan tool Driver Seat Belt Status parameter does display Buckled
5. Install a 3 A fused jumper wire between the signal circuit terminal A and the ground circuit terminal B.
6. Verify the scan tool Driver Seat Belt Status parameter is Unbuckled.
• If the scan tool Driver Seat Belt Status parameter does not display Unbuckled
1. Disconnect the harness connector at the K36 inflatable restraint sensing and diagnostic module.
2. Ignition ON.
3. 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
4. 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 scan tool Driver Seat Belt Status parameter does display Unbuckled
7. Ignition OFF, reconnect all harness connectors. Ignition ON.
8. With a scan tool, monitor the Driver Seat Belt Status parameter while buckling and unbuckling the seat belt. The parameter should display Buckled and Unbuckled when buckling and unbuckling the seat belt.
• If the Driver Seat Belt Status parameter does not display Buckled and Unbuckled
Test or replace the B88 driver seat belt switch.
• If the Driver Seat Belt Status parameter does display Buckled and Unbuckled
9. All OK.
Component Testing
1. Ignition OFF.
2. Disconnect the harness connector at the B88 driver seat belt switch.
3. B88 seat belt buckle in the buckled position.
4. Test for infinite resistance between the signal circuit terminal A and the ground terminal B at the B88 driver seat belt switch.
• If less than infinite resistance
Replace the B88 driver seat belt switch.
• If infinite resistance
5. B88 seat belt switch in the unbuckeld position.
6. Test for less than 2 ohms between the signal circuit terminal A and the ground terminal B at the B88 driver seat belt switch.
• If 2 ohms or greater
Replace the B88 driver seat belt switch.
• If less than 2 ohms
7. 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, setup, and programming