Seat Belt Indicator Malfunction - Driver
Seat Belt Indicator Malfunction - Driver
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 seat belt buckle switch is located within the seat belt buckle assembly and provides an input to the inflatable restraint sensing and diagnostic module (SDM). The SDM supplies a low reference circuit and a seat belt switch signal circuit to determine a buckled or unbuckled condition.
If the SDM determines the driver seat belt has not been buckled, the SDM will send a serial data message to the instrument panel clutch (IPC) to illuminate the seat belt warning indicator. If the SDM determines that a driver is sitting in the driver seat and the seat belt has not been buckled, the SDM will send a serial data message to the passenger presence system (PPS) display to illuminate the driver seat belt warning indicator.
Reference Information
Schematic Reference
Seat Belt Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
SIR System Description and Operation SIR System
Electrical Information Reference
* Circuit Testing Circuit Testing
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
* Connector Repairs Connector Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool Driver Seat Belt Switch parameter while buckling and unbuckling the driver seat belt. The parameter should change between Buckled and Unbuckled.
• If the parameter does not cycle between the specified values, refer to Driver Seat Belt Switch Circuit Malfunction.
2. Ignition ON, while sitting in the driver seat with the seat belt unbuckled, verify the driver seat belt warning indicator is illuminated on the PPS display.
• If the indicator is not illuminated, replace the PPS display.
Circuit/System Testing
Note:
When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the appropriate component/connector:
* The SDM
* The SDM wiring harness connector
* The seat belt buckle
* The seat belt buckle wiring harness connector
Driver Seat Belt Switch Circuit Malfunction.
1. Ignition OFF, disconnect the harness connector at the driver seat belt switch.
2. Ignition ON, test for less than 10 ohms between the low reference circuit terminal A (X1) and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the SDM.
3. Ignition ON, verify the scan tool Driver Seat Belt Switch parameter is Unbuckled.
• If not the specified value, test the signal circuit terminal B (X1) 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 B (X1) and the low reference circuit terminal A (X1). 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.
5. If all circuits test normal, test or replace the seat belt buckle assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Seat Belt Buckle Pretensioner Replacement Removal and Replacement
* Control Module References Control Module References for SDM replacement, programming and setup