B320A

DTC B320A

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 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

Diagnostic Fault Information





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 (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 (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 (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 commanded.

Circuit/System Testing

B320A 39

Ignition ON, command the appropriate power window DOWN and UP with a scan tool. The power window should go DOWN and UP as commanded.

If the DTC is current and the power window is inoperative, replace the power window motor.

If the DTC is history and the power window performs the UP and DOWN functions, clear the DTC.

B320A 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

Ignition ON, command the front window motor fully DOWN by pressing and holding the front window switch for 5 seconds, then command the front window motor fully UP by lifting and holding the front window switch for 5 seconds.

If the DTC resets, replace the power window motor.

Repair Instructions

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

Front Side Door Window Regulator Motor Replacement (Sedan/Wagon) (Service and Repair)