Seat Belt Indicator Circuit Malfunction - Driver
Seat Belt Indicator Circuit Malfunction - Driver
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Typical Scan Tool Data
Circuit/System Description
The inflatable restraint sensing and diagnostic module (SDM) communicates the status of the driver seat belt switch to the instrument panel cluster (IPC). When the ignition switch is turned ON, with the driver seat occupied and the driver seat belt is unbuckled, the SDM sends a message to the IPC to illuminate the fasten safety belt indicator for 72 seconds or until the seat belt is fastened. If the seat belt is buckled before the ignition switch is turned ON, the fasten safety belt indicator will remain OFF. When the seat belt is unbuckled, the seat belt switch is Closed. When the seat belt is buckled, the seat belt switch is Open.
Reference Information
Schematic Reference
Seat Belt Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Seat Belt System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, with a scan tool command the I/P indicators ON and OFF. The driver seat belt indicator should turn ON and OFF when changing between the commanded states.
• If the seat belt indicator is always OFF, replace the I/P cluster.
2. Ignition ON, with the driver seat occupied, buckle and unbuckle the driver seat belt. The driver seat belt indicator should go ON and OFF while buckling and unbuckling the driver seat belt.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the driver seat belt buckle.
2. Ignition OFF, test for less than 5 ohms between the seat belt switch low reference circuit terminal A 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, test for 4.8-5.2 volts between the seat belt 5-volt signal circuit terminal B and ground.
• If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the SDM.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the SDM.
4. If all circuits test normal, test or replace the seat belt switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the driver seat belt buckle.
2. Test for infinite resistance between the signal terminal B and the low reference terminal A with the seat belt buckle buckled.
• If not the specified value, replace the driver seat belt buckle.
3. Test for less than 2.0 ohms between the signal terminal B and the low reference terminal A with the seat belt buckle unbuckled.
• If greater than the specified range, replace the driver 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 SDM and IPC replacement, setup, and programming