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DTC B324A

DTC B324A

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 B324A 02

Rear Cargo Door Unlock Motor Circuit Short to Ground

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Liftgate Release Relay Control B324A 02 1 1 -
1. Liftgate Release Malfunction


Circuit/System Description

When the body control module 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

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 the 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

Connector End View Reference

Component Connector End Views

Description and Operation

Liftgate 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

Doors UNLOCKED, command the A23C liftgate latch unit to release by pressing the S58A liftgate release switch. The A23C liftgate latch unit should release the liftgate.

Circuit/System Testing


1. Disconnect the X3 harness connector at the X53A fuse block-rear body.

2. Connect a test lamp between the control circuit terminal 21 and ground.

3. Command the liftgate to UNLATCH with a scan tool. The test lamp should illuminate during the unlatch command.

4. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

5. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

6. If all circuits test normal, replace the X53A fuse block-rear body.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Front Compartment Fuse Block Replacement

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