Chevrolet Trax: DTC B3245: Rear cargo door lock actuator circuit

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 Descriptors

DTC B3245

Rear Cargo Door Lock Actuator Circuit

For symptom byte information refer to: Symptom Byte List

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 V.
• When the relay is actively commanded by the BCM.

Conditions for Setting the DTC

B3245 01

The BCM detects a short to voltage in the liftgate unlatch relay control circuit.

B3245 02

The BCM detects a short to ground in the liftgate unlatch 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 (Encore), Release Systems Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Rear Hatch/Gate 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

1. Ignition ON.
2. Verify the M30 Liftgate Latch functions when commanding the Liftgate Unlatch with a scan tool.

• If the M30 Liftgate Latch does not function

Refer to Circuit/System Testing.

• If the M30 Liftgate Latch does function

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 2 and ground.
3. Verify the test lamp turns ON and OFF when commanding the Liftgate Unlatch with a scan tool.

• If the test lamp is always OFF

1. Ignition OFF, remove the test lamp, 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, remove the test lamp, 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 1 and B+.
5. Verify the test lamp turns ON and OFF when commanding the Liftgate Unlatch with a scan tool.

• If the test lamp is always OFF

1. Ignition OFF, remove the test lamp, 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, remove the test lamp, 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 85 and 86.

• If less than 60 or greater than 200

Replace the KR95A Liftgate Unlatch Relay.

• If between 60-200 ohms

3. Test for infinite resistance between the terminals listed below:

• 30 and 86
• 30 and 87
• 30 and 85
• 85 and 87
• 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 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.
5. Test for less than 2 ohms between terminals 30 and 87.

• 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 after completing the repair.

• Relay Replacement (Within an Electrical Center) , Relay Replacement (Attached to Wire Harness)
• Control Module References for BCM replacement, programming and setup

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