Seat Belt Indicator Malfunction - Passenger
Seat Belt Indicator Malfunction - Passenger
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 passenger seat belt switch supplies a ground to the SDM when the passenger seat belt is unbuckled. When a seat belt is buckled, a switch opens removing the ground to the SDM. The SDM will then supply voltage to the seat belt indicator, in the hazard warning switch, which will then cause that indicator to illuminate.
Reference Information
Schematic Reference
Seat Belt Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector End Views By Name
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 Programming and Relearning for scan tool information
Circuit/System Verification
1. Monitor the scan tool Passenger Seat Belt Status parameter while buckling and unbuckling the passenger seat belt. The value should display Buckled and Unbuckled when changing seat belt states.
• If the scan tool Passenger Seat Belt Status parameter does not display Buckled and Unbuckled when changing seat belt states
Refer to Seat Belt Switch Malfunction.
• If the scan tool Passenger Seat Belt Status parameter does display Buckled and Unbuckled when changing seat belt states
2. Command the Driver Seat Belt Reminder ON and OFF with a scan tool. The seat belt indicator should turn ON and OFF while changing between the commanded states.
• If the driver seat belt indicator does not turn ON and OFF as commanded
Refer to Seat Belt Indicator Malfunction.
• If the driver seat belt indicator does turn ON and OFF as commanded
3. All OK.
Circuit/System Testing
Seat Belt Switch Malfunction
1. Ignition OFF. Disconnect the harness connector at the B88P seat belt switch-passenger.
2. Test for less than 10 ohms between the low reference circuit terminal 1 and ground.
• If 10 ohms or greater
1. Disconnect the X2 harness connector at the K36 SDM.
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 SDM.
• If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Passenger Seat Belt Status parameter listed below is Buckled.
• If the scan tool Passenger Seat Belt Status parameter does not display Buckled
1. Disconnect the X2 harness connector at the K36 SDM.
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 than 2 ohms, replace the K36 SDM.
• If the scan tool Passenger Seat Belt Status parameter does display Buckled
5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
6. Verify the scan tool Passenger Seat Belt Status parameter is Unbuckled.
• If the scan tool Passenger Seat Belt Status parameter does not display Unbuckled
1. Disconnect the X2 harness connector at the K36 SDM. 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.
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 SDM.
• If the scan tool Passenger Seat Belt Status parameter does display Unbuckled
7. Replace the B88P seat belt switch-passenger.
Seat Belt Indicator Malfunction
1. Ignition OFF.
2. Disconnect the harness connector at the S48 multifunction switch 1-instrument panel.
3. Test for less than 10 ohms between the ground circuit terminal 1 and ground.
• If 10 ohms or greater
Repair the open/high resistance in the circuit.
• If less than 10 ohms
4. Ignition ON. With a scan tool, command the Passenger Seat Belt Reminder Indicator OFF.
5. Test for less than 11 V between the control circuit terminal 4 and ground.
• If 11 V or greater
1. Ignition OFF. Disconnect the X1 harness connector at the K36 SDM. Ignition ON.
2. Test for less than 1 V between the control circuit terminal 4 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K36 SDM.
• If less than 11 V
6. With a scan tool, command the Passenger Seat Belt Reminder Indicator ON.
7. Test for greater than 4 V between the control circuit terminal 4 and ground.
• If 4 V or less
1. Ignition OFF. Disconnect the X 1 harness connector at the K36 SDM.
2. Test for infinite resistance between the control circuit terminal 4 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohms between the control circuit terminal 4 and ground.
• If 2 ohms or greater repair the open/high resistance in the circuit.
• If less than 2 ohms replace the K36 SDM.
• If greater than 4 V
8. Replace the S48 multifunction switch 1-instrument panel.
Component Testing
1. Ignition OFF. Disconnect the harness connector at the B88P seat belt switch-passenger. Buckle the passenger seat belt.
2. Test for infinite resistance between the signal circuit terminal 2 and the low reference terminal 1 at the B88P seat belt switch-passenger.
• If there is not infinite resistance
Replace the B88P seat belt switch-passenger.
• If there is infinite resistance
3. Unbuckle the passenger seat belt.
4. Test for less than 2 ohms between the signal circuit terminal 2 and the low reference terminal 1 at the B88P seat belt switch-passenger.
• If 2 ohms or greater
Replace the B88P seat belt switch-passenger.
• If less than 2 ohms
5. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Instrument Panel Multifunction Switch Replacement (Traction Control) Instrument Panel Multifunction Switch Replacement (Traction Control)Instrument Panel Multifunction Switch Replacement (Park Assist) Instrument Panel Multifunction Switch Replacement (Park Assist)
* Front Seat Belt Buckle Replacement Front Seat Belt Buckle Replacement
* Control Module References Programming and Relearning for the SDM replacement, programming and setup