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 provide an overview of each diagnostic category. |
DTC Descriptors
This diagnostic procedure supports the following DTCs:
DTC B3265 01: Trunk Release Output Circuit Short to BatteryDTC 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 |
|---|---|---|---|---|
Switch Signal Circuit | 2 | 2 | -- | -- |
Rear Compartment Lid Latch Motor Voltage Control Circuit | 1 | 1 | 1 | -- |
Trunk Release Relay Control Circuit | B3265 06 | B3265 06 | B3265 01 | -- |
Switch Ground Circuit | -- | 2 | -- | -- |
Rear Compartment Lid Latch Motor Voltage Ground Circuit | -- | 1 | -- | -- |
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 near 0 volts 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 ignition is ON.
Conditions for Setting the DTC
The following conditions exist for more than 1 second:
B3265 01
The BCM detects a short to battery in the trunk release relay control circuit when the output is active.
B3265 06
The BCM detects a short to ground or an open in the trunk release relay control circuit when the output is inactive.
Action Taken When the DTC Sets
The BCM disables the trunk release relay control until the next ignition cycle.
Conditions for Clearing the DTC
| • | The current DTC clears when the malfunction is no longer present. |
| • | The history DTC will clear after 100 consecutive fault-free ignition cycles have occurred. |
Reference Information
Schematic Reference
Connector End View Reference
Vehicle Access Connector End Views
Electrical Information Reference
Scan Tool Reference
Diagnostic Aids
DTC B3265 06 will also set anytime the 10-amp trunk fuse is open. Besides a short to ground on the relay coil voltage supply circuit or the relay switch voltage supply circuit, a short to ground on the rear compartment lid release actuator output circuit can cause the fuse to open.
Circuit/System Verification
Ignition ON, use the scan tool special functions output control to command the trunk release solenoid ON and observe the operation of the trunk lid. The trunk lid should release.
Circuit/System Testing
- Ignition OFF, disconnect the trunk relay from the rear fuse block.
- Verify that a test lamp illuminates between the relay switch voltage supply circuit and ground.
- Verify that a test lamp illuminates between the relay coil voltage supply circuit and ground.
- Connect a test lamp between the relay coil control circuit and the relay coil voltage supply circuit.
- Using a scan tool, command the trunk release solenoid ON and OFF. The test lamp should momentarily turn ON each time the solenoid is commanded ON.
- If all circuits/connections test normal, replace the trunk relay.
| ⇒ | If the test lamp does not illuminate, repair the relay switch voltage supply circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance. If the voltage supply circuit fuse is open, test the relay switch control circuit for a short to ground. If all circuit tests normal, test or replace the trunk relay. |
| ⇒ | If the test lamp does not illuminate and the trunk fuse is open, test the relay output control circuit for a short to ground. |
| ⇒ | If the test lamp remains ON all the time, test for a short to ground on the relay coil control circuit. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the relay coil control circuit. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
