• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category

The Inflatable Restraint Sensing and Diagnostic Module (SDM) monitors the passenger seat status and the passenger seat belt buckle switch and provides an output to the passenger seat belt indicator. When the Inflatable Restraint Sensing and Diagnostic Module detects the passenger seat is occupied and the seat belt is not fastened, the Inflatable Restraint Sensing and Diagnostic Module supplies a pulse width modulated signal to control the passenger seat belt indicator circuit. The Inflatable Restraint Sensing and Diagnostic Module monitors the passenger seat belt indicator circuits and if a fault is detected a DTC will be set.

Ignition voltage is between 9–16 V.

The passenger seat belt indicator circuit is shorted to voltage.

The passenger seat belt indicator circuit is shorted to ground.

The passenger seat belt indicator circuit is open.

The Inflatable Restraint Sensing and Diagnostic Module will store the DTC.

The condition for setting the DTC no longer exists.

Seat Belt Schematics

Master Electrical Component List

Seat Belt System Description and Operation

• Circuit Testing
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Connector Repairs

Control Module References for scan tool information

Refer to SIR Disabling and Enabling.

Refer to SIR Service Precautions.

1. Ignition OFF.
2. Disconnect the harness connector at the A98 Front Overhead Console Assembly.
3. Test for less than 10 Ω between the ground circuit terminal 5 and ground.
• If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, repair the open/high resistance in the ground connection.
• If less than 10 Ω
4. Passenger seat occupied.
5. Test for less than 11 V between the control circuit terminal 13 and ground.
• If 11 V or greater
1. Ignition OFF.
2. Verify the SIR system is disabled.
3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
4. Ignition ON, vehicle in Service Mode.
5. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If less than 11 V
6. Test for greater than 25 Ω between the control circuit terminal 13 and ground.
• If 25 Ω or less
1. Ignition OFF.
2. Verify the SIR system is disabled.
3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
4. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
5. Test for less than 2 Ω in the control circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If greater than 25 Ω
7. Test or replace the A98 Front Overhead Console Assembly.

Perform the Diagnostic Repair Verification after completing the repair.

• Roof Console Replacement for A98 Front Overhead Console Assembly Replacement
• Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, programming, and setup