Wednesday, August 14, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 217


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 volts.



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 (See: Body and



Frame/Doors, Hood and Trunk/Trunk / Liftgate/Service and Repair/Procedures) 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 (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Diagrams/Electrical Diagrams)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)

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