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 on. 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 instrument panel multifunction switch. After receiving the message, the instrument panel multifunction switch 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 Fuel Pump and Level Sensor Assembly
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, have an occupant sit in the passenger seat.
2. Verify the scan tool Passenger Seat Occupancy Status parameter is Occupied.
• If not Occupied
Replace the passenger presence sensor.
• If Occupied
3. Ignition ON.
4. Verify the passenger seat belt indicator turns ON and OFF when performing the Passenger Seat Belt Reminder Indicator On/Off Control Function with a scan tool.
• If the passenger seat belt indicator does not turn ON and OFF
Refer to Seat Belt Indicator Malfunction.
• If the passenger seat belt indicator turns ON and OFF
5. Verify the scan tool Passenger Seat Belt Status parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt.
• If the parameter does not change between Buckled and Unbuckled when buckling and unbuckling the seat belt
Refer to Seat Belt Switch Malfunction.
• If the parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt
6. All OK.
Circuit/System Testing
Seat Belt Switch Malfunction
Note: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
* B88 Seat Belt Switch
* Seat belt switch harness connector
* K36 Inflatable Restraint Sensing and Diagnostic Module
* Inflatable Restraint Sensing and Diagnostic Module harness connector
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B88P Seat Belt Switch-Passenger. 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 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. Test for less than 2 ohms in the 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 Passenger Seat Belt Status parameter displays Buckled.
• If not 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 than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If 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 displays Unbuckled.
• If not Unbuckled
1. Disconnect the 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 Unbuckled
7. Test or replace the B88P Seat Belt Switch-Passenger.
Seat Belt Indicator Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48C Multifunction Switch 1 - Instrument Panel. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Connect a test lamp between the control circuit terminal 4 and ground, ignition ON.
4. Verify the test lamp turns ON and OFF when commanding the Passenger Seat Belt Reminder Indicator ON and OFF with a scan tool.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1V or greater, repair the short to voltage on the circuit.
• If less than 1V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
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 in the 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 test lamp turns ON and OFF
5. 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 passenger 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 B88P Seat Belt Switch-Passenger.
• If infinite resistance
3. Unbuckle the passenger 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 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
* Inflatable Restraint Front Passenger Presence Sensor Replacement Service and Repair
* Instrument Panel Multifunction Switch Replacement Instrument Panel Multifunction Switch Replacement
* Control Module References Control Module References for Inflatable Restraint Sensing and Diagnostic Module or instrument panel cluster replacement, programming and setup