For 1990-2009 cars

### 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 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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Driver Door Module B+ | U0199 00 | U0199 00 | -- | --
Driver Window Motor B+ | U1511 00 | U1511 00 | -- | B320A 4B
LR Window Switch B+ | 3 | 3 | -- | --
Passenger Door Module B+ | U0200 00 | U0200 00 | -- | --
Passenger Window Motor B+ | U1511 00 | U1511 00 | -- | B320A 4B
RR Window Switch B+ | 4 | 4 | 4 | --
Driver Window Motor Serial Data | U1511 00 | U1511 00 | 1 | B320A 4B
Passenger Window Motor Serial Data (AXC) | 2 | 2 | 2 | --
LR Window Motor Control | 3 | 3 | 3 | --
Passenger Window Motor Control (AXE) | B3205 00 | B3205 0B | B3205 00 | --
RR Window Motor Control | 4 | 4 | 4 | --
Window Master Switch LR Down Control | B3820 00 | B3820 00 | B3820 00 | --
Window Master Switch Lockout Control | B3821 00 or B3824 00 | B3821 00 or B3824 00 | B3821 00 or 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 | --
Driver Door Module Ground | -- | U1511 00 | 1 | --
LR Window Switch Ground | -- | 3 | 3 | --
Passenger Door Module Ground | -- | U1511 00 | 2 | --
Passenger Window Motor Ground (AXC) | -- | 2 | 2 | --
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) over the serial data link. 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 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

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Power Windows Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References 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 after completing the diagnostic procedure.

Door Window Regulator Motor Replacement