B396B
Liftgate Motor Clutch Malfunction - DTC B396B
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 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 liftgate module supplies power and ground to the liftgate clutch, which is part of the liftgate motor assembly. Upon receiving a liftgate open request, the liftgate module supplies voltage to the clutch via the liftgate motor engage control circuit. The liftgate motor disengage control circuit supplies 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
The system voltage is 9-16 V.
Conditions for Setting the DTC
B396B 01
The liftgate module detects a short to voltage in the liftgate clutch engage control circuit or the liftgate clutch disengage control circuit.
B396B 02
The liftgate module detects a short to ground in the liftgate clutch engage control circuit or the liftgate clutch disengage control circuit.
B396B 04
The liftgate module detects an open/high resistance in the liftgate clutch engage control circuit or the liftgate clutch 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 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 module loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the liftgate module.
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 OFF, transmission in Park, using either the power door lock switches or the remote keyless entry transmitter, LOCK all doors and then UNLOCK all doors. This will set the liftgate module door lock status to unlock.
2. Select the enable button on the Interior liftgate control switch and activate the power open function, verify the scan tool LGM Clutch Actuator Cmd. changes from Inactive to Active.
Circuit/System Testing
1. Ignition OFF, disconnect the X3 harness connector at the liftgate control module.
2. Test for less than 15 ohms between the control terminal 14 at the liftgate control module and ground.
• If greater than the specified range, replace the liftgate control module.
3. Test for less than 15 ohms between the control terminal 13 at the liftgate control module and ground.
• If greater than the specified range, replace the liftgate control module.
4. Test for 9-10 ohms between the control circuit terminal 13 and control circuit terminal 14 at the liftgate motor assembly.
• If less than the specified range, test either control circuit for a short to ground. If the circuits test normal, replace the liftgate actuator assembly.
• If greater than the specified range, test either control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the liftgate actuator assembly.
5. If all circuits test normal, replace the 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 liftgate control module replacement, programming and setup