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Fuel Filler Door Release Malfunction (with Theft Deterrent System)

Fuel Filler Door Release Malfunction (with Theft Deterrent System)

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 has overviews of all diagnostic categories.


Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Door Lock Signal

B3135 02

1

1

-

Fuel Door Relay Coil Signal

B3938 02

1

1

-

Fuel Door Relay Switch Signal

B3130 02

1

1

-

Fuel Door Actuator Control

B3130 02

1

1

-

Fuel Door Relay Coil Ground

1

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 is supplied by the door lock signal circuit and the driver door unlock signal circuit which is switched through the fuel door relay. The fuel door relay coil is controlled by the body control module (BCM). When the vehicles doors are unlocked, the body control module (BCM) will respond by applying voltage to the fuel door relay coil control circuit. This energizes the coil causing the switch contacts to close. With the switch contacts closed, the driver door unlock circuit supplies B+ or ground to the fuel door unlatch actuator , unlocking the fuel door.

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 information on diagnostic tools

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 X2 connector at the X53A Fuse Block - Rear Body.

2. Test for greater than 5 Ω between the ground circuit terminal 36 X2 and ground.

3. If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 5 X2 and ground.

5. If the test lamp illuminates, test the control circuit for a short to voltage.

6. Press the door unlock button on the door lock switch and verify that a test lamp illuminates between the control circuit terminal 5 X2 and ground.

7. If the test lamp does not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

8. Connect a 15 A fused jumper wire between the door unlock control circuit terminal 28 X2 and the control circuit terminal 13 X2. Verify the M27 Fuel Door Unlatch Actuator is activated when the door unlock switch is pressed.

9. If the M27 Fuel Door Unlatch Actuator does not activate, test the control circuits for an open/high resistance. If the circuit tests normal, test or replace the M27 Fuel Door Unlatch Actuator.

10. If all circuits test normal, replace the X53A Fuse Block - Rear Body.


Component Testing


Fuel Door Unlatch Actuator Test

1. Ignition OFF, disconnect the harness connector at the M27 Fuel Door Unlatch Actuator.

2. Connect a bridging connector, protected with a 25 amp fuse, between the locking control terminal 2 and 12 V. Briefly make and break a connection between control terminal 1 and ground. The M27 fuel filler cap release actuator should lock and unlock.

3. If the function does not perform as specified, replace the M27 Fuel Door Unlatch Actuator.

4. Reverse the jumper wires; the M27 Fuel Door Unlatch Actuator should perform the Unlock/Lock function.

5. 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

Rear Electrical Center or Junction Block Replacement

Control Module References for information on BCM replacement, setup, and programming