B396A
Liftgate Motor Power Open/Close Malfunction - DTC B396A
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 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 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 liftgate control module 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 9-16 V.
* Power open or close function is initiated.
Conditions for Setting the DTC
B396A 01
The liftgate control module detects a short to voltage in the liftgate motor control circuits.
B396A 02
A loss of B+ voltage to the liftgate control module or the liftgate control module detects a short to ground in the liftgate motor control circuits.
B396A 04
The liftgate control module detects an open/high resistance in the liftgate motor control circuits.
Action Taken When the DTC Sets
The power liftgate may be inoperative in the power mode and in the manual mode.
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
Note: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power Service and Repair for the appropriate procedure.
Whenever the liftgate control module loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the liftgate control module.
In some circumstances high or low control circuit faults may cause the liftgate control module to react as if the liftgate has encountered an object in its travel and reverse direction.
Reference Information
Schematic Reference
Liftgate Schematics Liftgate Schematics
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
Rear Hatch/Gate Description and Operation Rear Hatch/Gate
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, doors unlocked, transaxle in Park, verify that the power liftgate is enabled 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. The liftgate should release and power open.
3. With the liftgate open, activate the power close. The liftgate should power close.
Circuit/System Testing
1. Ignition OFF, disconnect the X2 harness connector at the K39 liftgate control module.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X2 harness connector and disconnect the X3 harness connector at the K39 liftgate control module.
4. Test for infinite resistance between the control circuit terminal 1 and ground.
• If not the specified value, replace the liftgate actuator assembly.
5. Test for infinite resistance between the control circuit terminal 2 and ground.
• If not the specified value, replace the liftgate actuator assembly.
6. Test for less than 25 ohms between the control circuit terminal 1 and the control circuit terminal 2.
• If greater than the specified range, replace the liftgate actuator assembly.
7. If all circuits test normal, replace the K39 liftgate control module.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Liftgate Actuator Replacement Liftgate Actuator Replacement
* Control Module References Control Module References for the liftgate control module replacement, programming and setup