B320B

DTC B320A-B320C

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 B320A 39
- Front Door Window Motor Internal Electronic Failure

DTC B320A 42
- Front Door Window Motor Calibration Data Set Not Programmed

DTC B320A 4B
- Front Door Window Motor Calibration Not Learned

DTC B320B 39
- Rear Door Window Motor Internal Electronic Failure

DTC B320B 42
- Rear Door Window Motor Calibration Data Set Not Programmed

DTC B320B 4B
- Rear Door Window Motor Calibration Not Learned

DTC B320C 39
- Middle Door Window Motor Internal Electronic Failure

DTC B320C 42
- Middle Door Window Motor Calibration Data Set Not Programmed

DTC B320C 4B
- Middle Door Window Motor Calibration Not Learned




Circuit/System Description

The front door, rear door and middle door power window motors communicate with the driver door module (DDM), passenger door module (PDM) and rear door modules and middle door modules over the LIN BUS. 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

Power window switch activated.


Conditions for Setting the DTC

B320A 39

An internal malfunction 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 LIN BUS circuit.


Action Taken When the DTC Sets

The appropriate power window will be inoperative


Conditions for Clearing the DTC

B320A 39, B320B 39, B320C 39

The affected power window motor has an internal electrical failure and must be replaced before the DTC can be cleared.

B320A 42, B320B 42, B320C 42

The affected power window motor must be programmed before the DTC can be cleared.

B320A 4B, B320B 4B, B320C 4B

The affected power window motor must be calibrated before the DTC can be cleared.


Reference Information
Schematic Reference

Moveable Window Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Windows Description and Operation (Power Windows 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

Programming and Relearning (Programming and Relearning) for scan tool information


Circuit/System Verification

Ignition ON, command the appropriate door window DOWN and UP with a scan tool. The door window should perform the DOWN and UP function.


Circuit/System Testing

B320A 39, B320A 42, B320B 39, B320B 42, B320C 39 or B320C 42

Ignition ON, reprogram the appropriate power window and operate the power window within the conditions for running the DTC, verify the DTC does not reset.

If the DTC resets, replace the power window motor.


B320A 4B, B320B 4B or B320C 4B

Ignition ON, command the appropriate power window motor fully DOWN by pressing and holding the window switch for 5 seconds, then command the power window motor fully UP by lifting and holding the window switch for 5 seconds. Operate the power window within the conditions for running the DTC, verify the DTC does not reset

If the DTC resets, replace the power window motor.



Repair Instructions

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

* Rear Side Door Window Regulator Motor Replacement (Service and Repair)
* Front Side Door Window Regulator Motor Replacement (Service and Repair)