B324A
DTC B324A or B3245
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 Descriptors
DTC B324A 01
- Rear Cargo Door Unlock Motor Circuit Short to Battery
DTC B3245 02
- Rear Cargo Door Lock 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 or rear closure latch.
Conditions for Running the DTC
* The system voltage is 9-16 V.
* When the relay is actively commanded by the BCM.
Conditions for Setting the DTC
B324A 01
The BCM detects a short to voltage in the liftgate release relay control circuit.
B3245 02
The BCM detects a short to ground in the liftgate release relay control circuit.
Action 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 Release Systems Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Luggage Compartment Description and Operation Description and Operation
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 Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the operation of the liftgate latch 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 KR95A liftgate unlatch relay. Ignition ON.
2. Connect a test lamp between the control circuit terminal 1 and ground.
3. Verify the test lamp briefly illuminates when commanding the Trunk Lid Unlatch On and Off with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
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
3. 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. Connect a test lamp between the control circuit terminal 2 and B+.
5. Verify the test lamp briefly illuminates when commanding the Trunk Lid Unlatch On and Off with a scan tool.
• 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 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
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.
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.
• If the test lamp turns ON and OFF
6. Test or replace the KR95A liftgate unlatch relay.
Component Testing
Relay Test
1. Ignition OFF, disconnect the KR95A liftgate unlatch relay.
2. Test for 60-200 ohms between terminals 1 and 3.
• If less than 60 ohms or greater than 200 ohms
Replace the KR95A liftgate unlatch relay.
• If between 60-200 ohms
3. Test for infinite resistance between the terminals listed below:
* 4 and 3
* 4 and 5
* 4 and 1
* 5 and 1
• If less than infinite resistance
Replace the KR95A liftgate unlatch relay.
• If infinite resistance
4. Install a 3 A fused jumper wire between relay terminal 3 and 12 V. Install a jumper wire between relay terminal 1 and ground.
5. Test for less than 2 ohms between terminals 4 and 5.
• If 2 ohms or greater
Replace the KR95A liftgate unlatch relay.
• If less than 2 ohms
6. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Control Module References Control Module References for BCM replacement, programming and setup