Captiva

Seat Belt Indicator Circuit Malfunction - Driver

The driver 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 SDM sends the status of the driver seat belt via serial data to the instrument panel cluster. After receiving the message, the instrument panel cluster controls the illumination of the driver seat belt indicator.

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. Ignition ON, with a scan tool command the instrument cluster to turn on all indicators and verify the driver seat belt indicator is illuminated for 5 seconds.

⇒	If the indicator does not illuminate, replace the P16 instrument panel cluster.

2. With the scan tool, monitor the Driver Seat Belt Status parameter while buckling and unbuckling the seat belt. The parameter should display Buckled and Unbuckled when buckling and unbuckling the seat belt.

Note: When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:

•	Seat belt switch

•	Seat belt switch harness connector

•

SDM

•	SDM wiring harness connector

1. Ignition OFF, disconnect the harness connector at the seat belt switch.
2. Test for less than 5 Ω between the ground circuit terminal 2 or 3 (short body) and ground.

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

3. Ignition ON, verify the scan tool Driver Seat Belt Status parameter displays Buckled.

⇒	If not the specified value, test the signal circuit terminal 4 or 5 (short body) for a short to ground. If the circuit tests normal replace the SDM.

4. Install a 3 A fused jumper wire between the signal circuit terminal 4 or 5 (short body) and the ground circuit terminal 2 or 3 (short body). Verify the scan tool Driver Seat Belt Status parameter displays Unbuckled.

⇒	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 SDM.

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

1. Ignition OFF, disconnect the harness connector at the seat belt switch.
2. Test for infinite resistance between the signal circuit terminal 4 or 5 (short body) and the ground terminal 2 or 3 (short body), at the switch, with the switch in the open position.

⇒	If not the specified value, replace the B88 seat belt switch.

3. Test for less than 5 Ω between the signal circuit terminal 4 or 5 (short body) and the ground terminal 2 or 3 (short body), at the switch, with the switch in the closed position.

⇒	If greater than the specified range, replace the seat belt switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.