Chevrolet Trax: Seat belt indicator malfunction - passenger

Diagnostic Instructions

• 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.

Diagnostic Fault Information

Circuit/System Description

When an individual is sitting in the passenger seat the passenger presence sensor detects the individual. A signal to the Inflatable Restraint Sensing and Diagnostic Module indicates a person is in the passenger seat. The Inflatable Restraint Sensing and Diagnostic Module will turn the passenger seat belt indicator. The passenger seat belt switch is a 2-wire switch wired to the Inflatable Restraint Sensing and Diagnostic Module using a signal circuit and a low reference circuit. When the seat belt is unbuckled the switch is closed, and when the seat belt is buckled the switch is open. The Inflatable Restraint Sensing and Diagnostic Module sends the status of the passenger seat belt via a hard wire to the passenger air bag disable indicator. After receiving the message, the passenger air bag disable indicator controls the illumination of the passenger seat belt indicator

Diagnostic Aids

Objects on the passenger seat can cause the passenger seat belt reminder to be commanded on. Depending on the sensing technology used, a conductive object (computers, MP3 players, cell phones, diagnostic scan tool, wires, a hand, etc.) placed on the passenger seat may cause the Passenger Presence Detection Module to command the passenger air bag indicator ON and/or command the passenger seat belt indicator ON. The fasten seat belt chime will also sound.

Reference Information

Schematic Reference

Seat Belt Schematics (Encore), Seat Belt Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Seat Belt System Description and Operation

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify the passenger seat belt indicator turns ON and OFF when commanding the Passenger Seat Belt Reminder Indicator with a scan tool.

If the passenger seat belt indicator does not turn ON and OFF

Refer to Seat Belt Indicator Malfunction in Circuit/System Testing.

If the passenger seat belt indicator turns ON and OFF

3. Verify the scan tool Passenger Seat Belt Status parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt.

If the parameter does not change between Buckled and Unbuckled when buckling and unbuckling the seat belt

Refer to Seat Belt Switch Malfunction in Circuit/System Testing.

If the parameter changes between Buckled and Unbuckled when buckling and unbuckling the seat belt

4. All OK.

Circuit/System Testing

Passenger Seat Belt Switch Malfunction

1. Ignition OFF. Disconnect the harness connector at the B153P Seat Belt Buckle-Passenger.
2. Test for less than 5 ohms between the low reference circuit terminal 2 and ground.

If 5 ohms or greater

1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. Test for less than 2 ohms in each control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If less than 5 ohms

3. Ignition ON.
4. Verify the scan tool Passenger Seat Belt Status parameter listed below is Buckled.

If not Buckled

1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. Test for infinite resistance between the seat belt switch signal circuit terminal 1 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If Buckled

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
6. Verify the scan tool Passenger Seat Belt Status parameter is Unbuckled

If not Unbuckled

1. Ignition OFF. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. Ignition ON.
2. 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.

3. Test for less than 2 ohms in each circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K36 Inflatable Restraint Sensing and Diagnostic Module

If Unbuckled

7. Test or replace the B153P Seat Belt Buckle-Passenger.

Passenger Seat Belt Indicator Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the P14 Passenger Air Bag Disable Indicator.
2. Test for less than 10 ohms between the ground circuit terminal 4 and ground.

If 10 ohms or greater

1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.

If less than 10 ohms

3. Ignition ON. With a scan tool, command the Passenger Seat Belt Reminder Indicator OFF.
4. Test for less than 11 V between the control circuit terminal 6 and ground.

If 11 V or greater

1. Ignition OFF. Disconnect the X1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. Ignition ON.
2. Test for less than 1 V between the control circuit terminal 6 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

5. With a scan tool, command the Passenger Seat Belt Reminder Indicator ON.
6. Test for greater than 4 V between the control circuit terminal 6 and ground.

If 4 V or less

1. Ignition OFF. Disconnect the X 1 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
2. Test for infinite resistance between the control circuit terminal 6 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

3. Test for less than 2 ohms between the control circuit terminal 6 and ground.

• If 2 ohms or greater repair the open/high resistance in the circuit.
• If less than 2 ohms replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

If greater than 4 V

7. Replace the P14 Passenger Air Bag Disable Indicator.

Component Testing

1. Ignition OFF. Disconnect the harness connector at the B153P Seat Belt Buckle-Passenger. Buckle the B153P Seat Belt Buckle-Passenger.
2. Test for infinite resistance between the signal circuit terminal 1 and the low reference terminal 2 at the B153P Seat Belt Buckle-Passenger.

If less than infinite resistance

Replace the B153P Seat Belt Buckle-Passenger

If infinite resistance

3. Unbuckle the B153P Seat Belt Buckle-Passenger.
4. Test for less than 1 ohms between the signal circuit terminal 1 and the low reference terminal 2 at the B153P Seat Belt Buckle-Passenger.

If 1 ohms or greater

Replace the B153P Seat Belt Buckle-Passenger.

If less than 1 ohms

5. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Front Seat Belt Buckle Replacement
• Instrument Panel Airbag Arming Status Display Replacement (Trax) , Instrument Panel Airbag Arming Status Display Replacement (Encore)
• Control Module References for Inflatable Restraint Sensing and Diagnostic Module and Instrument Cluster replacement, programming and setup

SEAT BELT SERVICE PRECAUTIONS

NOTE: If the vehicle has been in a collision, refer to Repairs and Inspections Required After a Collision for additional information.

Do not bleach or dye the seat belt webbing. Use only the following items in order to clean the seat belt webbing:

• A mild soap and water solution
• A soft brush or cloth

• Keep sharp edges and damaging objects away from the seat belts. Avoid bending or damaging any part of the seat belt buckle or the latch plate. Replace any seat belts which are cut or damaged in any way.
• Use only the correct seat belt anchor bolts/screws and tighten the anchor bolts/screws to the correct torque value. Refer to Fastener Tightening Specifications. When installing seat belt anchor bolts, start the bolt by hand to ensure that the bolt is threaded straight.
• Some seat belts and retractors require service as a set, with service replacement parts only. Do not attempt to repair to individual components that require service as a set.
• Verify that the replacement part number is correct for the vehicle at that seating position. Do not substitute a seat belt from a different seating position.

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