B396A

DTC B396A

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 B396A 01
Liftgate Motor Control Circuit Short to Battery

DTC B396A 02
Liftgate Motor Control Circuit Short to Ground

DTC B396A 04
Liftgate Motor Control Circuit Open




DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM DESCRIPTION
The liftgate motor is a bi-directional motor and open or close operation is the result of the direction of the motor rotation. The power liftgate control module (PLGM) controls the liftgate motor through the control circuits by supplying power and ground in the appropriate polarity. The motor control circuits are monitored by the PLGM prior to activation for a high or low condition and during motor operation for any irregular current flow conditions.

CONDITIONS FOR RUNNING THE DTC
- System voltage to the PLGM must be 9-16 volts.
- Power open or close function is initiated.

CONDITIONS FOR SETTING THE DTC
- The PLGM detects a high or low condition on one of the control circuits prior to being activated.
- During power open or close operation, the PLGM detects current flow on one of the control circuits to be greater or less than the learned limits.

ACTION TAKEN WHEN THE DTC SETS
Power liftgate operation will be suspended.

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
In some circumstances high or low control circuit faults may cause the PLGM to react as if the liftgate has encountered an object in its travel and reverse direction.

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 1 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 2 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 1 and control circuit terminal 2.
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, test or replace the liftgate motor assembly.

COMPONENT TESTING
1. Install a 30-amp fused jumper wire between the control terminal 1 and 12 volts. Momentarily install a jumper wire between the control terminal 2 and ground. The liftgate motor should perform the OPEN or CLOSE function.
- If the function does not perform as specified, replace the liftgate motor assembly.
2. Reverse the jumper wires, the liftgate motor should perform the CLOSE or OPEN function.
- If the function does not perform as specified, replace the liftgate motor assembly.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Programming and Relearning Programming and Relearning
- Power Liftgate Motor Replacement