The front and rear power windows are controlled by the driver door module (DDM) and front passenger door module (PDM). The DDM and PDM each contain power window switches that are integrated into the module. The DDM contains the master power window switches that control all power window operations. The power window switch contained in the PDM controls the front passenger window operation only.

When the driver power window switch is activated to a desired position, the DDM examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no prohibitive messages have been received, the DDM will send a serial data message to the driver door window motor to move the window to the desired position.

When the DDM receives a request to operate the right side passenger windows from the master switch, a serial data message is sent to the PDM. The PDM examines the request and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the PDM will send a serial data message to the appropriate window motor to move the window as requested.

When the DDM receives a request to operate a rear window from the master switch, a serial data message is sent to the BCM. The BCM examines the request and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the appropriate rear window switch which will command the window motor as requested.

Schematic Reference

Moveable Window Schematics

Door Control Module Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the operation of the power windows while commanding each window UP and DOWN by using their respective window switches, each window should perform the UP and DOWN function.

⇒	If the driver window malfunctions, refer to Front Window Malfunction.

⇒	If the front passenger window malfunctions, refer to Front Window Malfunction.

⇒	If either rear passenger power window malfunctions, refer to Rear Passenger Window Malfunction.

2. Observe the scan tool Driver Window RF Switch, Driver Window LR Switch and Driver Window RR Switch parameters while using the driver master control switches. The parameter should change between Off/Up/Down/Express Down.

⇒	If the value does not change between commanded states, replace the DDM.

3. Observe the scan tool Window Lockout Switch parameter while pressing and depressing the window lockout switch on the driver master control. The parameter should change between On and Off.

⇒	If the value does not change between commanded states, replace the DDM.

4. Command the express up and express down functions of the driver and passenger door windows by pressing their window switches past the first detent and releasing and pulling their window switches past the first detent and releasing. The appropriate window should perform the express up and express down function.

⇒	If the function does not perform as specified, refer to Window Regulator Motor Programming and Setup.

Front Window Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the appropriate door module.
2. Test for less than 1 ohm between the ground circuit terminal 6 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit 4 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Ignition OFF, connect the X1 harness connector at the door module.
5. Ignition ON, observe the scan tool Driver LF Window Switch parameters while using the driver power window switch on the DDM and the scan tool Passenger Window Switch parameters while using the passenger window switch on the PDM. The parameter should change between Off, Up, Down, Express Up, and Express Down.

⇒	If the value does not change between commanded states, replace the door module.

6. Ignition OFF, disconnect the harness connector at the window motor.
7. Test for less than 5 ohms between the ground circuit terminal 4 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

8. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

9. If all circuits test normal, replace the window motor.

Rear Window Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Test for less than 1 ohm between the ground circuit terminal E and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal H and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

Important: Check the lockout switch on the driver door switch and verify the rear window switches are enabled.

4. Test for greater than 9 volts between the control circuit terminal D and ground.

⇒	If less than the specified range, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.

5. Test for greater than 9 volts between the signal circuit terminal B and ground while commanding the rear window UP by using the window switch on the driver master control.

⇒	If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.

6. Test for greater than 9 volts between the signal circuit terminal C and ground while commanding the rear window UP by using the window switch on the driver master control.

⇒	If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.

7. Ignition OFF, connect the rear window switch and disconnect the harness connector at the rear window motor.
8. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
9. Ignition ON, command the rear window UP and DOWN by using the rear window switch. The test lamp should illuminate when commanding the UP and DOWN states.

⇒	If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or open/high resistance. If the circuits test normal, replace the rear window switch

⇒	If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the rear window switch.

10. If all circuits test normal, test or replace the rear window motor.

Rear Window Motor

1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
2. Install a 25A fused jumper wire between one of the control terminals and 12V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the window motor should perform the UP/DOWN functions.

⇒	If it does not perform as specified, replace the window motor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.