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 Descriptors

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 liftgate control module (LGM) 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 LGM prior to activation for a high or low condition and during motor operation for any irregular current flow conditions.

Conditions for Running the DTC

* The system voltage is 9-18 volts.
* Power open or close function is initiated.

Conditions for Setting the DTC

* The LGM detects a high or low condition on one of the control circuits prior to being activated.
* During power open or close operation, the LGM 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 DTC.
* A history DTC will clear after 50 ignition cycles.

Diagnostic Aids

Important: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power for the appropriate procedure.

Whenever the LGM loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the LGM.

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

Circuit/System Verification

1. Ignition ON, doors unlocked, transaxle in Park, enable the power liftgate by pressing the liftgate enable/disable button on the I/P switch assembly.
2. Open the liftgate by pressing the touchpad on the liftgate handle switch and close by pressing the liftgate button switch. The liftgate should release, power open, power close, cinch-in and latch.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X3 at the LGM.
2. Ignition OFF, test for less than 1.0 ohm between the control terminal 1 and ground.

^ If greater than the specified range, replace the LGM.

3. Ignition OFF, test for less than 1.0 ohm between the control terminal 2 and ground.

^ If greater than the specified range, replace the LGM

4. Connect a test lamp between control terminal 1 and control terminal 2.
5. Ignition ON, 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 is always OFF during either of the commands, replace the LGM.
^ If the test lamp is always ON, replace the LGM.

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

* Liftgate Actuator Replacement