vauxhall Workshop Repair Guides

Vauxhall Workshop Service and Repair Manuals

ABOUT US
Trunk/Liftgate Ajar Indicator Malfunction > < DTC B3797

Astra J

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

Doors Lock Signal

B3125 02. B3130 02, B3135 02

1

1

--

Fuel Door Relay Coil Control

B3938 02

1

1

--

Fuel Door Relay Output Control

1

1

1

--

Fuel Door Actuator Control

B3125 02. B3130 02, B3135 02

1

1

--

Fuel Door Relay Coil Ground

1

1

1

--

1. Fuel Door Release Malfunction

Circuit/System Description

The locking and unlocking of the fuel door is a function of the power door lock system. The fuel door release 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 release 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
    •  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

Note:  Circuit/System Verification must be performed before Circuit/System Testing.

  1. Ignition OFF, disconnect the harness connectors at the X50A Fuse Block - Underbonnet.
  2. Test for less than 5 Ω between the ground circuit terminal 48 X1 and ground.
    3. ⇒ If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 36 X2 and ground. Verify the test lamp does not illuminate.
    4. ⇒ If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
  4. Command the power door locks to lock and unlock using the power door lock switch. The test lamp should illuminate briefly.
    5. ⇒ If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K9 Body Control Module.
  5. Test for 7-10 V between the control circuit terminal 11 X2 and ground.
    6. ⇒ If less than the specified range, test the control circuit for an open/high resistance.
  6. Connect the harness connectors at the X50A Fuse Block - Underbonnet and disconnect the harness connector at the M27 Fuel Door Unlatch Actuator.
  7. Connect a test lamp between the control circuit terminal 2 and ground. Verify the test lamp does not illuminate.
    8. ⇒ If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the X50A Fuse Block - Underhood.
  8. Command the power door locks to lock and unlock using the power door lock switch. The test lamp should illuminate briefly.
    9. ⇒ If the test lamp does not illuminate, test the control circuit terminal 2 for a short to ground or an open/high resistance. If the circuits test normal, replace the X50A Fuse Block - Underbonnet.
  9. Connect a test lamp between the control circuit terminals 1 and 2.
  10. Command the power door locks to lock and unlock using the power door lock switch. The test lamp should illuminate briefly for each command.
    11. ⇒ If the test lamp does not illuminate, test the control circuit terminal 1 for an open/high resistance.
  11. If all circuits test normal, test or replace the M27 Fuel Door Unlatch Actuator.

Component Testing

Fuel Door Release 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.

    •  Control Module References for BCM replacement, setup and programming

Trunk/Liftgate Ajar Indicator Malfunction > < DTC B3797