B396B

DTC B396B

DIAGNOSTIC INSTRUCTIONS
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC DESCRIPTOR

DTC B396B 01
Liftgate Motor Clutch Control Circuit Short to Battery

DTC B396B 02
Liftgate Motor Clutch Control Circuit Short to Ground

DTC B396B 04
Liftgate Motor Clutch Control Circuit Open




DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM DESCRIPTION
The power liftgate module (PLGM) supplies power and ground to the liftgate clutch, which is part of the liftgate motor assembly. Upon receiving a liftgate open request, the PLGM supplies voltage to the clutch via the liftgate motor engage control circuit. The liftgate motor disengage control circuit serves a ground. With the clutch energized, the motor output is mechanically connected to the liftgate and power liftgate operation is allowed. The liftgate motor clutch engages or disengages the liftgate motor to the liftgate drive gear and is the component that determines power or manual operation.

CONDITIONS FOR RUNNING THE DTC
System voltage to the PLGM must be 9-16 volts.

CONDITIONS FOR SETTING THE DTC

B396B 01
The PLGM detects a short to voltage in the liftgate motor engage control circuit or the liftgate motor disengage control circuit.

B396B 02
The PLGM detects a short to ground in the liftgate motor engage control circuit or the liftgate motor disengage control circuit.

B396B 04
The PLGM detects an open/high resistance in the liftgate motor engage control circuit or the liftgate motor disengage control circuit.

ACTION TAKEN WHEN THE DTC SETS
- When an open or short to ground condition exists, power liftgate operation will be inoperative.
- When a short to voltage condition exists, the liftgate can not be opened or closed manually.

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 status code.

DIAGNOSTIC AIDS
Whenever the PLGM is disconnected or loses power, the ignition must be cycled OFF then ON.

CIRCUIT/SYSTEM TESTING
1. Ignition OFF, disconnect the harness connector X3 at the PLGM.
2. Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal 4 and ground.
- If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the PLGM.
3. Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal 3 and ground.
- If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the PLGM.
4. Connect a test lamp between control circuit terminal 4 and control circuit terminal 3.
5. Command the power liftgate to OPEN and CLOSE with a scan tool. The test lamp should turn ON when commanding the OPEN and CLOSE states.
- If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the PLGM.
6. If all circuits test normal, replace the liftgate motor assembly.

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

Power Liftgate Motor Replacement