GM Service Manual Online
For 1990-2009 cars only

DTC B3265 Sedan

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 00: Trunk/Hatch/Liftglass Release Output Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Trunk Relay B+

1

1

--

--

Trunk Release Switch Signal

B2730 00

2

2

--

Rear Compartment Lid Latch Control

1

1

1

--

Trunk Release Relay Control

B3265 00

B3265 00

B3265 00

--

Rear Compartment Lid Latch Ground

--

1

1

--

Rear Compartment Lid Release Switch Ground

--

2

2

--

1. Trunk release is inoperative from both the switch and keyless entry transmitter

2. Trunk release is inoperative only from switch

Circuit/System Description

The body control module (BCM) provides a low side drive output that controls the trunk relay. The BCM monitors the voltage level on the trunk release relay control circuit to determine when a failure has occurred. The voltage level on this circuit should be high while the trunk relay is not energized, that is the trunk release feature has not been activated. Voltage will be less than 1V when the relay is energized. When the BCM receives a trunk release signal from a switch or keyless entry transmitter, it responds by applying ground to the trunk release relay control circuit, which energizes the trunk relay.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

The BCM detects a fault in the trunk release relay control circuit when the output is active.

Action Taken When the DTC Sets

The rear compartment lid latch will malfunction.

Conditions for Clearing the DTC

    • The DTC will be current for as long as the fault is present.
    • When the fault is no longer present, the DTC will become a history DTC.
    • A history DTC will clear after 50 ignition cycles.

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
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

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

Circuit/System Testing

  1. Ignition OFF, disconnect the TRUNK RELEASE relay.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 85 and ground.
  3. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the TRUNK RELEASE relay.
  4. Connect a test lamp between the control circuit terminal 86 and the B+ circuit terminal 85.
  5. Command the Trunk Release Test ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  6. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  7. If all circuits test normal, test or replace the TRUNK RELEASE relay.

Component Testing

  1. Ignition OFF, disconnect the TRUNK RELEASE relay.
  2. Test for 60-180 Ω between terminals 85 and 86.
  3. If not within the specified range, replace the relay.
  4. Test for infinite resistance between the following terminals:
  5. • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    If less than the specified value, replace the relay.
  6. Install a 25A fused jumper wire between relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 Ω between terminals 30 and 87.
  7. If greater than the specified range, replace the relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement
    •  Control Module References for BCM replacement, setup and programming

DTC B3265 Wagon

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 00: Turn/Hatch/Liftglass Release Output Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Rear End Release Relay Switch B+

2

2

--

--

Liftgate Release Switch Signal

B2730 00

1

1

--

Rear End Release Relay Coil Control

--

2

2

--

Rear End Release Relay Coil Control

B3265 00

2

2

--

Liftgate Latch Control

--

2

2

--

Liftgate Latch Ground

--

2

2

--

Liftgate Release Switch Ground

--

1

1

--

1. Liftgate Release Switch Malfunction

2. Liftgate Release Malfunction

Circuit/System Description

The body control module (BCM) provides voltage to the liftgate release relay control circuit thus energizing the Rear End Release relay which provides voltage to the liftgate latch assembly releasing the liftgate.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

The BCM detects short to voltage in the liftgate latch relay coil control ground circuit.

Action Taken When the DTC Sets

The liftgate latch will malfunction.

Conditions for Clearing the DTC

    • The DTC will be current for as long as the fault is present.
    • When the fault is no longer present, the DTC will be a history DTC.
    • A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Release Systems Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Rear Hatch/Gate 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

Command the liftgate latch to release by pressing the liftgate release switch. The liftgate latch should release the liftgate.

Circuit/System Testing

  1. Ignition OFF, disconnect the Rear End Release relay.
  2. Connect a test lamp between the control circuit terminal 86 and B+.
  3. Command the liftgate latch assembly by pressing and releasing the liftgate release switch. The test lamp should turn ON and OFF when changing between the commanded states.
  4. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
    If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the Rear End Release relay.

Component Testing

  1. Ignition OFF, disconnect the Rear End Release relay.
  2. Test for 60-200 ohms between terminals 85 and 86.
  3. If not within the specified range, replace the relay.
  4. Test for infinite resistance between the following terminals:
  5. • 30 and 86
    • 30 and 87
    • 30 and 85
    • 85 and 87
    If less than the specified range, replace the Rear End Release relay.
  6. Install a 3A fused jumper wire between the relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.
  7. If greater than the specified range, replace the Rear End Release relay.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Relay Replacement
    •  Control Module References for BCM replacement, setup, and programming