GM Service Manual Online
For 1990-2009 cars only

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.

DTC Descriptor

DTC B3265 01: Trunk Release Output Circuit Short to Battery

DTC B3265 06: Trunk Release Output Circuit Short to Ground or Open

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Rear Compartment Lid Release Switch Signal

1

1

1

--

Rear Compartment Lid Release Switch Ground

--

1, 2

1, 2

--

Trunk Release Relay Control

B3265 06

B3265 06

B3265 01

--

Switch Side Supply Voltage Relay

1, 2

1, 2

--

--

1. Rear Compartment Lid Release Switch Malfunction

2. Rear Compartment Lid Release Malfunction

Circuit/System Description

The body control module (BCM) provides a low side drive output that controls the trunk release relay.

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

B3265 01

This DTC will set when the BCM detects a short to battery in the trunk relay output circuit.

B3265 06

This DTC will set when the BCM detects an open or short to ground in the trunk relay output circuit.

Action Taken When the DTC Sets

    • The BCM stores the DTC to memory.
    • The rear compartment lid latch will malfunction.

Conditions for Clearing the DTC

    • This DTC will change from current to history when the fault is no longer present.
    • A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

Reference Information

Schematic Reference

Release Systems Schematics

Connector End View Reference

Vehicle Access Connector End Views

Description and Operation

Luggage Compartment Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

    •  Scan Tool Data List
    •  Scan Tool Data Definitions
    •  Scan Tool Output Controls

Circuit/System Verification

Command the trunk release with a scan tool. The rear compartment lid release actuator should release the trunk lid.

Circuit/System Testing

  1. Disconnect the harness connector at the underhood fuse block.
  2. Connect a test lamp between the control circuit terminal B10 and B+.
  3. Command the trunk release ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  4. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, replace the underhood fuse block.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Control Module References for BCM replacement, setup and programming
    •  Underhood Electrical Center or Junction Block Bracket Replacement