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Fuel Filler Door Release Malfunction

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

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Driver Door Unlock Signal

B3125 02, B3130 02, B3135 02

1

1

--

Door Lock Signal

B3125 02, B3130 02, B3135 02

1

1

--

1. Fuel Door Unlatch Malfunction

Circuit/System Description

The locking and unlocking of the fuel door is a function of the power door lock system. The fuel door unlatch actuator shares the circuit with the driver door latch. 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 unlatch actuator control circuits to B+ voltage. The opposing side of the door latch and fuel door unlatch actuator is connected to ground provided by the BCM through the other the door latch control circuits, along with the fuel door unlatch actuator, will lock or unlock as commanded.

Reference Information

Schematic Reference

Release Systems Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel Fill Door 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

Observe the operation of the power door locks and fuel filler door while using the power door lock switch. The fuel filler door should lock and unlock as commanded along with the door locks.

⇒If the power door locks do not lock and unlock, refer to Symptoms - Vehicle Access .

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the M27 Fuel Door Unlatch Actuator.
  2. Connect a test lamp between the control circuit terminals 1 and 2.
  3. Command the power door locks to lock and unlock using the power door lock switch. The test lamp should illuminate briefly for each command.
    4. ⇒If the test lamp does not illuminate, test the control circuits for an open/high resistance. If the circuits test normal, test or replace the M27 Fuel Door Unlatch Actuator.

Component Testing

Fuel Door Unlatch Actuator Test

  1. Ignition OFF, disconnect the harness connector at the M27 Fuel Door Unlatch Actuator.
  2. Install a 25 A fused jumper wire between the lock control terminal 2 and B+. Momentarily install a jumper wire between the unlock control terminal 1 and ground. The M27 Fuel Door Unlatch Actuator should perform the lock/unlock function.
    3. ⇒If the function does not perform as specified, replace the M27 Fuel Door Unlatch Actuator.
  3. Reverse the jumper wires; the M27 Fuel Door Unlatch Actuator should perform the unlock/lock function.
    4. ⇒If the function does not perform as specified, replace the M27 Fuel Door Unlatch Actuator.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Fuel Tank Filler Door Lock Actuator Replacement
    • Control Module References for BCM replacement, setup, and programming
   


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