Seat Belt Indicator Circuit Malfunction - Passenger

Seat Belt Indicator Circuit 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. Observe the scan tool parameter, Passenger Seat Belt Status, while buckling and unbuckling the passenger seat belt. The value should change from Buckled to Unbuckled.

• If the values does not change, refer to Seat Belt Switch Malfunction.

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 indicator is always ON or always OFF, refer to Seat Belt Indicator Malfunction.

Circuit/System Testing

Seat Belt Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate B153 seat belt buckle.
2. Test for less than 1 ohm between the ground circuit terminal 1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the K36 SDM.

3. Ignition ON, verify the scan tool Seat Belt Status parameter listed below is Buckled.

• If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K36 SDM.

4. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1. Verify the scan tool Seat Belt Status parameter is Buckled.

• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K36 SDM

5. If all circuits test normal, test or replace the B153 seat belt buckle.

Seat Belt Indicator Malfunction
1. Ignition OFF, disconnect the harness connector X1 at the hazard warning switch.
2. Test for less than 1 ohm between the ground circuit terminal 1 X1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit terminal 4 X1 and ground.
4. Ignition ON, command the Passenger Seat Belt Reminder ON and OFF with a scan tool, the test lamp should turn ON and OFF while changing between the commanded states.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K36 SDM.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K36 SDM.

5. If all circuits test normal, replace the hazard warning switch. Refer to Hazard Warning Switch Replacement (Service and Repair).

Component Testing

1. Ignition OFF, disconnect the harness connector at the appropriate B153 seat belt buckle.
2. Test for infinite resistance between the signal terminal 2 and the ground terminal 1 with the switch in the open position.

• If not the specified value, replace the B153 seat belt buckle.

3. Test for less than 2 ohm between the signal terminal 2 and the ground terminal 1 with the switch in the closed position.

• If greater than the specified range, replace the B153 seat belt buckle.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Driver or Passenger Seat Belt Buckle Replacement (Driver or Passenger Seat Belt Buckle Replacement)
* Control Module References (Programming and Relearning) for the SDM replacement, setup, and programming