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
When an individual is sitting in the passenger seat the passenger presence sensor detects the individual. A signal to the inflatable restraint sensing and diagnostic module indicates a person is in the passenger seat. The inflatable restraint sensing and diagnostic module will turn the passenger seat belt indicator. The passenger 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 passenger seat belt via a hard wire to the passenger air bag disable indicator. After receiving the message, the passenger air bag disable indicator controls the illumination of the passenger seat belt indicator.
Diagnostic Aids
Objects on the passenger seat can cause the passenger seat belt reminder to be commanded on. Depending on the sensing technology used, a conductive object (computers, MP3 players, cell phones, diagnostic scan tool, wires, a hand, etc.) placed on the passenger seat may cause the Passenger Presence Detection Module to command the passenger air bag indicator ON and/or command the passenger seat belt indicator ON. The fasten seat belt chime will also sound.
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. Ignition ON.
2. With a scan tool, Command the Passenger Seat Belt Reminder Indicator ON and OFF.
• If the passenger seat belt reminder indicator turns ON and OFF as commanded, refer to Passenger Seat Belt Switch Malfunction.
• If the passenger seat belt reminder indicator does not turn ON and OFF as commanded, refer to Passenger Seat Belt Indicator Malfunction.
Circuit/System Testing
Passenger Seat Belt Switch Malfunction
1. Ignition OFF. Disconnect the harness connector at the B88P seat belt switch-passenger.
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 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 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 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 less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• 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 1 and the low reference circuit terminal 2.
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. 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.
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 scan tool Passenger Seat Belt Status parameter does display Unbuckled
7. Replace the B88P Seat Belt Switch-Passenger.
Passenger Seat Belt Indicator Malfunction
1. Ignition OFF. Disconnect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel.
2. Test for less than 10 ohms between the ground circuit terminal 4 and ground.
• If 10 ohms or greater
Repair the open/high resistance in the circuit.
• If less than 10 ohms
3. Ignition ON. With a scan tool, command the Passenger Seat Belt Reminder Indicator OFF.
4. Test for less than 11 V between the control circuit terminal 6 and ground.
• If 11 V or greater
1. Ignition OFF. Disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
2. Test for less than 1 V between the control circuit terminal 6 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If less than 11 V
5. With a scan tool, command the Passenger Seat Belt Reminder Indicator ON.
6. Test for greater than 4 V between the control circuit terminal 6 and ground.
• If 4 V or less
1. Ignition OFF. Disconnect the X 1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. Test for infinite resistance between the control circuit terminal 6 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 6 and ground.
• 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 greater than 4 V
7. Replace the S48C Multifunction Switch 1 - Instrument Panel.
Component Testing
1. Ignition OFF. Disconnect the harness connector at the B88P seat belt switch-passenger. Buckle the B88P seat belt switch-passenger.
2. Test for infinite resistance between the signal circuit terminal 1 and the low reference terminal 2 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 B88P seat belt switch-passenger.
4. Test for less than 1 ohms between the signal circuit terminal 1 and the low reference terminal 2 at the B88P seat belt switch-passenger.
• If 1 ohms or greater
Replace the B88P seat belt switch-passenger.
• If less than 1 ohms
5. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Seat Belt Buckle Replacement Front Seat Belt Buckle Replacement
* Hazard Warning Switch Replacement Service and Repair - for S48C Multifunction Switch 1 - Instrument Panel replacement
* Control Module References Control Module References for Inflatable Restraint Sensing and Diagnostic Module, passenger presence system, and instrument cluster replacement, programming and setup