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DTC B3938 > < Fuel Filler Door Release Malfunction

Astra J

Trunk/Liftgate Ajar Indicator 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

Rear Compartment Lid Ajar Switch Signal

2

2

2

-

Rear Compartment Lid Latch Ground

1

1

--

--

1. Boot Release Malfunction

2. Boot Ajar Indicator Malfunction

Circuit/System Description

The body control module (BCM) receives a discrete input from the rear compartment lid ajar switch signal circuit. When the rear compartment lid release actuator releases the rear compartment lid, the rear compartment lid ajar switch, which is internal to the rear compartment lid release actuator, is supplied with ground which causes the boot ajar switch signal circuit to be pulled low. The BCM interprets this and communicates via serial data with the instrument panel cluster. When the boot is open/ajar and the vehicle is in any gear other than Park, the driver information centre will display BOOT OPEN. If the boot is still open and the vehicle speed is greater than 5 km/h (3 MPH) a chime will sound.

Reference Information

Schematic Reference

Release Systems Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Luggage Compartment Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Wiring Repairs


Scan Tool Reference

Control Module References

Circuit/System Verification

Ignition ON, observe the scan tool Rear Closure Ajar Switch parameter while opening and closing the trunk. The parameter should change between Inactive and Active.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the M30 Tailgate Latch.
  2. Test for less than 5 Ω between the ground circuit terminal 1 and ground.
    3. ⇒ If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Rear Closure Ajar Switch parameter is Inactive.
    4. ⇒ If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground. Verify the scan tool Rear Closure Ajar Switch parameter is Active.
    5. ⇒ If not the specified value, test the signal circuit terminal 2 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  5. If all circuits test normal, test or replace the M30 Tailgate Latch.

Component Testing

Static Test

  1. Ignition OFF, disconnect the harness connector at the M30 Tailgate Latch.
  2. Test for infinite resistance between the signal terminal 2 and the ground terminal 1 with the boot in the closed position.
    3. ⇒ If not the specified value, replace the M30 Tailgate Latch.
  3. Test for less than 5 Ω between the signal terminal 2 and the ground terminal 1 with the boot in the open position.
    4. ⇒ If greater than the specified range, replace the M30 Tailgate Latch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Control Module References for BCM replacement, setup and programming

DTC B3938 > < Fuel Filler Door Release Malfunction