Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B320A 39: Front Door Window Motor Internal Electronic FailureDTC 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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Driver Window Motor B+ | U1511 00 | U1511 00 | -- | B320A 4B |
LR Window Switch B+ | 3 | 3 | -- | -- |
Passenger Window Motor B+ | U1511 00 | U1511 00 | -- | B320A 4B |
RR Window Switch B+ | 4 | 4 | -- | -- |
Driver Window Motor Serial Data | U1500 02 | U1500 02 | U1500 02 | B320A 4B |
Passenger Window Motor Serial Data | U1500 02, U1511 00 | U1511 00 | U1511 00 | B320A 4B |
LR Window Motor Control | 3 | 3 | 3 | -- |
RR Window Motor Control | 4 | 4 | 4 | -- |
Window Master Switch LR Down Control | B3820 00 | B3820 00 | B3820 00 | -- |
LR Window Master Switch Lockout Control | B3821 00 | B3821 00 | B3821 00 | -- |
RR Window Master Switch Lockout Control | B3824 00 | B3824 00 | B3824 00 | -- |
Window Master Switch LR Up Control | B3819 00 | B3819 00 | B3819 00 | -- |
Window Master Switch RR Down Control | B3823 00 | B3823 00 | B3823 00 | -- |
Window Master Switch RR Up Control | B3822 00 | B3822 00 | B3822 00 | -- |
LR Window Switch Ground | -- | 3 | 3 | -- |
Driver Window Motor Ground | -- | U1511 00 | 1 | B320A 4B |
Passenger Window Motor Ground | -- | U1511 00 | 2 | B320A 42, B320A 4B |
RR Window Switch Ground | -- | 4 | 4 | -- |
1. Driver Window Malfunction 2. Passenger Window Malfunction 3. Left Rear Window Malfunction 4. Right Rear Window Malfunction | ||||
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
Connector End View Reference
Description and Operation
Power Windows Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References 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 after completing the diagnostic procedure.
