B320A

DTC B320A

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

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) 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

The DDM or PDM initializes on key up.

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 affected power window will be inoperative.

Conditions for Clearing the DTC

B320A 39

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

B320A 42

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

B320A 4B

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

Circuit/System Verification

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

Circuit/System Testing

B320A 39 or 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 appropriate power window motor.

B320A 4B

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

If the DTC resets, replace the appropriate power window motor.

Repair Instructions

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

Door Window Regulator Motor Replacement