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.

The ignition is ON.

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.

The BCM disables the trunk release relay control until the next ignition cycle.

Schematic Reference

Release Systems Schematics

Connector End View Reference

Vehicle Access Connector End Views

Electrical Information Reference

Scan Tool Reference

DTC B3265 06 will also set anytime the 10-amp TRUNK RELSE 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.

Ignition ON, press and hold the liftgate touch pad, observe the Trunk Release Solenoid Command parameter in the scan tool. The scan tool Trunk Release Solenoid Command parameter should display ON momentarily. The trunk lid should release.

1. Ignition OFF, disconnect the trunk relse relay from the rear fuse block.
2. Ignition ON, verify that the rear compartment lid latch is deactivated.

⇒	If the rear compartment lid latch is still activated, repair the relay switch control circuit for a short to voltage.

3. Verify that a test lamp illuminates between the relay coil voltage supply circuit and ground.

⇒	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 relse relay.

4. Verify that a test lamp illuminates between the relay switch voltage supply circuit and ground.

⇒	If the test lamp does not illuminate, repair the relay switch voltage supply circuit for a short to ground or an open/high resistance.

5. Disconnect the harness connector of the rear compartment lid latch.
6. Test for less than 1.0 ohm of resistance between the lid latch ground circuit terminal 3 and ground.

⇒	If greater than 1.0 ohm, test the ground circuit for an open/high resistance.

7. Connect the harness connector of the rear compartment lid latch.
8. Connect a 3-amp fused jumper wire between the relay switch voltage supply circuit terminal 142 and the relay switch control circuit terminal 140. Verify the rear compartment lid latch is activated.

⇒	If the rear compartment lid latch is not activated, test the relay switch control circuit for an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid latch.

9. Connect a test lamp between the relay coil control circuit terminal 143 and the relay coil voltage supply circuit terminal 139.
10. Press the trunk release switch. The test lamp should momentarily turn ON each time the solenoid is commanded ON.

⇒	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.

11. If all circuits/connections test normal, replace the trunk relse relay.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.