Diagnostic Fault Information
Perform the
Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Circuit/System Description
The inflatable restraint sensing and diagnostic module (SDM) sends the status of the driver seat belt switch to the instrument panel cluster (IPC) via a serial data message. If the seat belt is unfastened, the SDM will send a message to the IPC to illuminate
the fasten safety belt indicator for 72 seconds or until the seat belt is fastened.
Reference Information
Schematic Reference
Connector End View Reference
Seat Belt Connector End Views
Description and Operation
Seat Belt System Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, perform the IPC Lamp and Gauge Test using the scan tool and verify the driver seat belt indicator is illuminated.
| ⇒ | If the indicator does not illuminate, replace the IPC. |
Circuit/System Testing
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
| • | The left seat belt switch |
| • | The left seat belt switch harness connector |
| • | The SDM wiring harness connector |
- Ignition OFF, disconnect the harness connector at the driver seat belt switch.
- Ignition OFF, test for less than 1.0 ohm of resistance between the low reference circuit terminal C and ground.
| ⇒ | If greater than the specified value, test the low reference circuit for an open/high resistance. |
- Ignition ON, verify the scan tool driver seat belt switch parameter is Unbuckled.
| ⇒ | If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the SDM. |
- Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal C. Verify the scan tool driver seat belt switch 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 SDM. |
- If all circuits test normal, replace the driver seat belt switch.
Component Testing
- Ignition OFF, disconnect the harness connector at the driver seat belt switch.
- Test for infinite resistance between the signal circuit terminal A and the low reference circuit terminal C.
| ⇒ | If not the specified value, replace the left seat belt switch. |
- With the seat belt buckled, test for less than 2 ohms of resistance between the signal circuit terminal A and the Low reference circuit terminal C.
| ⇒ | If greater than the specified range, replace the driver seat belt switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
