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 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 driver power window motor communicates with the driver door lock/window switch over the serial data link. The motor contains a logic module which must be normalized or programmed any time the window motor is serviced to provide proper operation and communication between door lock/window switch and the window motor.
Conditions for Running the DTC
The driver door lock/window switch initializes on key up.
Conditions for Setting the DTC
B320A 39
An internal malfunction or a momentary voltage spike has been detected by the driver door lock/window switch in the driver window motor while commanding the window UP/DOWN.
B320A 42
A not normalized/programmed driver door power window motor.
B320A 4B
The driver 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 power window will be inoperative.
Conditions for Clearing the DTC
B320A 39
If the DTC is current, the window motor must be replaced before the DTC can be cleared.
B320A 42
The power window motor must be programmed before the DTC can be cleared.
B320A 4B
The power window motor must be calibrated before the DTC can be cleared.
Reference Information
Schematic Reference
Moveable Window Schematics (Except AXE) Moveable Window Schematics (Except AXE)Moveable Window Schematics (AXE) Moveable Window Schematics (AXE)
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
Power Windows Description and Operation (RPO AXC/AXE) Power Windows (RPO AXC/AXE)Power Windows Description and Operation (W/O AXC/AXE) Power Windows (W/O AXC/AXE)
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 power window DOWN and UP with a scan tool. The power window should perform the DOWN and UP functions.
Circuit/System Testing
B320A 39
Ignition ON, command the 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 power window and operate the power window within the conditions for running the DTC, verify the DTC does not reset.
If the DTC resets as current, 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 as current, replace the power window motor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair procedure.
Door Window Regulator Motor Replacement Service and Repair