B396B

DTC B396B

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)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 power liftgate module (LGM) supplies power and ground to the liftgate clutch, which is part of the liftgate motor assembly. Upon receiving a liftgate open request, the LGM 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

Battery voltage must be between 9-16 volts.


Conditions for Setting the DTC

* DTC B396B 01 will set when the LGM detects a short to voltage in the liftgate motor engage control circuit or the liftgate motor disengage control circuit.
* DTC B396B 02 will set when the LGM detects a short to ground in the liftgate motor engage control circuit or the liftgate motor disengage control circuit.
* DTC B396B 04 will set when the LGM detects an open/high resistance in the liftgate motor engage control circuit or the liftgate motor disengage control circuit.



Actions Taken When the DTC Sets

* When an open or short to ground condition exists, power liftgate operation will be disabled.
* When a short to voltage condition exists, the liftgate cannot be opened or closed manually.



Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* You issue a scan tool CLEAR DTCs command.



Diagnostic Aids

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


Reference Information
Schematic Reference

Liftgate Schematics (Liftgate Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Liftgate Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)


Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connectors at the LGM.
2. Ignition OFF, test for approximately 10 ohms of resistance between control circuit terminal 3 and control circuit terminal 4.

• If greater than the specified range, replace the liftgate motor assembly.

3. Ignition OFF, verify that continuity is not present between both control circuit terminals at the C3 harness connector and ground.

• If continuity is present, replace the liftgate motor assembly.

4. If all circuits test normal, replace the LGM.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Liftgate Close Actuator Motor Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for LGM replacement, setup, and programming