Chevrolet Trax: Fuel filler door release malfunction (NO8)

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

The locking and unlocking of the fuel door is a function of the power door lock system. The fuel door lock actuator shares the circuit with the door latch unlock control circuit. The body control module (BCM), upon receipt of a lock switch lock or unlock signal, will switch the appropriate door latch, as well as a fuel door lock actuator control circuits to B+ voltage. The opposing side of the door latch and fuel door lock actuator control circuit is pulled to ground by the BCM through the other the door latch control circuits, along with the fuel door lock actuator, will lock or unlock as commanded.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics (Encore), Door Lock/Indicator 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

Fuel Fill Door Description and Operation (NO8 Only)

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 M97 Fuel Door Lock Actuator does not release the fuel filler door when commanding the All Doors Lock/Unlock to Lock with a scan tool.

• If the M97 Fuel Door Lock Actuator releases the fuel filler door

Refer to Circuit/System Testing.

• If the M97 Fuel Door Lock Actuator does not release the fuel filler door

3. Verify the M97 Fuel Door Lock Actuator releases the fuel filler door when commanding the All Doors Lock/Unlock to Unlock with a scan tool.

• If the M97 Fuel Door Lock Actuator does not release the fuel filler door

Refer to Circuit/System Testing.

• If the M97 Fuel Door Lock Actuator releases the fuel filler door

4. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the M97 Fuel Door Lock Actuator.
2. Connect a test lamp between control circuit terminal 1 and control circuit terminal 2, ignition ON.
3. Verify the test lamp turns ON when commanding the All Doors Lock/Unlock with a scan tool.

If the test lamp remains OFF during either of the commands

1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between each control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 Body Control Module.

3. 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 K9 Body Control Module.
• If the test lamp turns ON during each of the commands

4. Test or replace the M97 Fuel Door Lock Actuator.

Component Testing

Fuel Door Latch

1. Ignition OFF, disconnect the harness connector at the M97 Fuel Door Lock Actuator.
2. Install a 25 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M97 Fuel Door Lock Actuator should perform the LOCK and UNLOCK function.

• If the actuator does not perform the LOCK and UNLOCK function

Replace the M97 Fuel Door Lock Actuator.

• If the actuator performs the LOCK and UNLOCK function

3. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Fuel Tank Filler Door Latch Housing Replacement (Encore) , Fuel Tank Filler Door Latch Housing Replacement (Trax)
• Control Module References for BCM replacement, programming and setup

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