B324A

DTC B324A

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B324A 02
- Rear Cargo Door Unlock Motor Circuit Short to Ground

Diagnostic Fault Information






Circuit/System Description

When the body control module (BCM) receives a liftgate release command, it will provide voltage to one side of the relay and ground to the other side of the relay. This will energize the relay causing the switch side of the relay to close and will then provide B+ voltage to the liftgate latch.

Conditions for Running the DTC

* The system voltage is 9-16 volts.

* When the relay is actively commanded by the BCM

Conditions for Setting the DTC

The BCM detects a short to ground in the liftgate release relay control circuit.

Actions Taken When DTC Sets

The liftgate latch will be inoperative.

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 Release Systems Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left Front

Description and Operation

Rear Hatch/Gate Description and Operation Rear Hatch/Gate

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify the operation of the liftgate when commanding the liftgate latch to UNLATCH by pressing the liftgate unlatch switch.

• If the liftgate latch does not UNLATCH
Refer to Circuit/System Testing.

• If the liftgate latch does UNLATCH

3. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the X50A fuse block-underhood. Ignition ON

2. Connect a test lamp between the control circuit terminal C6 and ground.

3. Verify the test lamp turns ON and OFF when commanding the liftgate latch ON and OFF by pressing the liftgate unlatch switch.

• If the test lamp is always OFF

1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.

2. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K9 body control module.

3. Ignition OFF.

4. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K9 body control module.

• If the test lamp is always ON

1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.

2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V, replace the K9 body control module

• If the test lamp turns ON and OFF

4. Replace the X50A fuse block - underhood.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Accessory Wiring Junction Block Replacement Accessory Wiring Junction Block Replacement

* Control Module References Programming and Relearning For BCM replacement, setup and programming