Seat Belt Indicator Malfunction - Passenger

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions Diagnostic Fault Information

Circuit	Circuit Function	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performan
Signal — Terminal 2 @ B153P Front Seat Belt Buckle - Passenger	Signal	1	2	2	—
Low Reference — Terminal 1 @ B153P Front Seat Belt Buckle - Passenger	Low Reference	—	2	—	—

Circuit/System Description For an overview of the component/system, refer to: Seat Belt System Description and Operation

Circuit	Description
Signal	The control module input circuit has an internal resistance connected to 12 V.
Low Reference	Grounded through the control module.

Component	Description
A103 Roof Console	Some buttons and indicators are hardwired, some functions use serial data communication.
B153 Seat Belt Buckle	When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open.
K36 Restraints Control Module	The control module monitors several sensors that can detect a collision. When a collision is detected, the control module will trigger certain airbags and seat belt pretensioners, depending on the angle and severity of the impact.

Reference Information Schematic Reference Seat Belt Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References Circuit/System Verification

Note

The condition may be intermittent and require driving the vehicle, then reviewing the snapshot to verify resistance parameters do not drop out or spike. Refer to Testing for Intermittent Conditions and Poor Connections

1. Ignition ON, Vehicle in service mode.
2. Verify there are no related DTCs set. ⇒ If related DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If no related DTCs are set
3. Verify the passenger seat belt indicator Illuminates once passenger seat is occupied. ⇒ If the passenger seat belt indicator does not illuminate Replace the component: A103 Roof Console. ⇓ If the passenger seat belt indicator illuminates
4. Verify the passenger seat belt indicator turns off after buckling the passenger seat belt with passenger seat occupied. ⇒ If the passenger seat belt indicator does not turn off Refer to Circuit/System Testing. ⇓ If the passenger seat belt indicator turns off
5. A fault is not currently present and may be an intermittent condition. Circuit/System Testing

Note

Refer to: SIR Service Precautions Refer to: SIR Disabling and Enabling. Inspect the terminals of the following components and connectors for damage or corrosion and repair or replace as necessary: – A103 Roof Console – B153 Seat Belt Buckle – K36 Restraints Control Module – Inline Harness Connector The connector position assurance (CPA) should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.

1. Ignition OFF, disconnect the harness connector at the appropriate B153 Seat Belt Buckle. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 5 Ω between the low reference circuit terminal 1 and ground. ⇒ If 5 Ω or greater 2.1. Ignition OFF. 2.2. Verify the SIR system is disabled. 2.3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. 2.4. Test for less than 2 Ω in the low reference 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 less than 5 Ω
3. Ignition ON.
4. Verify the appropriate scan tool Seat Belt Status parameter is Buckled. ⇒ If not Buckled 4.1. Ignition OFF. 4.2. Verify the SIR system is disabled. 4.3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. 4.4. Test for infinite resistance between the signal circuit terminal 2 and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇒ If infinite resistance, replace the K36 Inflatable Restraint Sensing and Diagnostic Module. ⇓ If Buckled
5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1.
6. Verify the appropriate scan tool Seat Belt Status parameter is Unbuckled. ⇒ If not Unbuckled 6.1. Ignition OFF. 6.2. Verify the SIR system is disabled. 6.3. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module, ignition ON. 6.4. Test for less than 1 V between the signal circuit and ground. ⇒ If 1  V or greater, repair the short to voltage on the circuit. ⇓ If less than 1 V 6.5. Test for less than 2 Ω in the signal 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 Unbuckled
7. Test or replace the B153P Front Seat Belt buckle - Passenger. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Roof Console Replacement Front Seat Belt Buckle Replacement For control module replacement, programming, and setup refer to: Control Module References