Spark

Seat Belt Indicator Circuit Malfunction - Driver

For vehicles equipped with the driver and passenger airbags, the driver seat belt switch will supply a ground for the seat belt indicator when the seat belt is unbuckled causing that indicator to illuminate.

For vehicles equipped with the driver airbag only, the driver seat belt switch supplies a ground to the SDM when the seat belt is buckled. When the driver is unbuckled, the seat belt switch opens removing the ground to the SDM. The SDM will then supply voltage to the seat belt indicator which will then cause that indicator to illuminate.

Schematic Reference

Seat Belt Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. With RPO AJ3, ignition ON, observe the scan tool Driver Seat Belt Status parameter while buckling and unbuckling the driver seat belt. The value should change from Unbuckled to Buckled.

⇒	If the values do not change, refer to Seat Belt Switch Malfunction (With RPO AJ3).

2. With RPO AJ3, 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 Driver Seat Belt Indicator Malfunction (With RPO AJ3).

3. Without RPO AJ3, ignition ON, observe the seat belt indicator while buckling and unbuckling the driver seat belt. The indicator should turn ON and OFF as the seat belt is buckled and unbuckled.

⇒	If the indicator is always ON or always OFF, refer to Seat Belt Switch Malfunction (Without RPO AJ3).

Seat Belt Switch Malfunction (With RPO AJ3)

1. Ignition OFF, disconnect the harness connector at the B153D driver seat belt buckle.
2. Test for less than 1 Ω 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 Driver Seat Belt Status parameter 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 Driver 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 B153D driver seat belt buckle.

Seat Belt Indicator Malfunction (With RPO AJ3)

1. Ignition OFF, disconnect the harness connector at the A5 driver information centre.
2. Test for less than 1 Ω between the ground circuit terminal 7 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 11 and ground.
4. Ignition ON, command the Driver 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 circuit test normal, replace the A5 driver information centre.

Seat Belt Switch Malfunction (Without RPO AJ3)

1. Ignition OFF, disconnect the harness connector at the B153D driver seat belt buckle.
2. Test for less than 1 Ω between the ground circuit terminal 1 and ground.

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

3. Ignition ON, verify the seat belt indicator is OFF.

⇒	If the seat belt indicator is ON, test the control circuit terminal 2 for a short to ground. If the circuit tests normal, replace the P16 instrument cluster.

4. Install a 3 A fused jumper wire between the control circuit terminal 2 and the ground circuit terminal 1. Verify the seat belt indicator is ON.

⇒	If the seat belt indicator is OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the P16 instrument cluster.

5. If all circuits test normal, test or replace the B153D driver seat belt buckle.

1. Ignition OFF, disconnect the harness connector at the B153D driver 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 B153D driver seat belt buckle.

3. Test for less than 2 Ω 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 B153D driver seat belt buckle.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.