2010 Cadillac CTS Sedan AWD V6-3.6L Page 212
Circuit/System Description
The front door power window motors communicate with the driver door module (DDM) and passenger door module (PDM) via serial data. The
motors contain a logic module which must be normalized or programmed any time the window motor is serviced to provide proper operation and
communication between door modules and window motors.
Conditions for Running the DTC
The DDM or PDM initializes on key up.
Conditions for Setting the DTC
B320A 39
An internal malfunction or a momentary voltage spike has been detected by the DDM or PDM in the front power window motor while
commanding the window UP/DOWN.
B320A 42
A not normalized/programmed driver or front passenger door power window motor.
B320A 4B
The front window motor experiences a loss of voltage in the B+ circuit or an open/high resistance in the serial data circuit.
Action Taken When the DTC Sets
The appropriate power window will be inoperative.
Conditions for Clearing the DTC
B320A 39
If the DTC is current, the appropriate window motor must be replaced before the DTC can be cleared.
B320A 42
The appropriate power window motor must be programmed before the DTC can be cleared.
B320A 4B
The appropriate power window motor must be calibrated before the DTC can be cleared.
Reference Information
Schematic Reference
Moveable Window Schematics (See: Windows and Glass/Windows/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Windows Description and Operation (See: Windows and Glass/Windows/Description and Operation/Power Windows Description and
Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, command the appropriate power window DOWN and UP with a scan tool. The power window should go DOWN and UP as
