B3825

DTC B3825

Circuit Description

The body control module (BCM) internally grounds the liftgate lock relay control circuit for the liftgate lock relay when it receives a class 2 message from the driver door module (DDM), passenger door module (PDM), or when a liftgate lock function is activated. When the BCM grounds the liftgate lock relay control circuit the liftgate lock relay is energized and locks the liftgate.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3825 Liftgate Lock Signal Circuit

Conditions for Running the DTC

* Battery voltage is between 9-16 volts.
* The DTC will set if the liftgate lock function is active or inactive.

Conditions for Setting the DTC

The DTC will set if the liftgate lock relay control circuit is shorted to ground or open for more than 1 second.

Action Taken When the DTC Sets

* If a short to ground is present on the liftgate lock relay control circuit, the liftgate lock relay will be energized and the liftgate lock actuator will be held in the lock position and will not unlock.
* If an open condition is present on the liftgate lock relay control circuit, the liftgate will unlock but not lock.
* The BCM will send a class 2 message to the driver information center (DIC) indicating that a fault has been detected and the DIC will display REPLACE LIFTGATE FUSE.

Conditions for Clearing the DTC

When the fault is no longer present, the BCM changes the current DTC to a history DTC. The BCM will clear the history DTC after 50 fault free ignition cycles.

Diagnostic Aids

DTC B3825 will set as current if any of the following conditions are present:

* An open ECC fuse
* An open or short to ground in the liftgate lock relay battery positive voltage circuit
* A faulty liftgate lock relay
* An open or short to ground in the liftgate lock relay control circuit
* A short to ground in the liftgate lock actuator lock control circuit will open the electronic climate control (ECC) with a lock command
* A faulty BCM

Test Description

Step 1 - Step 14:

The numbers below refer to the step numbers on the diagnostic table.
2. Command both the Lock and Unlock states. Repeat the commands as necessary.
3. Tests for voltage at the coil side of the liftgate lock relay. The ECC fuse supplies power to the coil side of the liftgate lock relay.
4. Verifies that the body control module is providing ground to the liftgate lock relay.
5. Tests if ground is constantly being applied to the liftgate lock relay.