The front and rear power windows are controlled by the driver door module (DDM) and front passenger door module (FPDM). The DDM and FPDM 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 front passenger window switch contained in the PDM controls the front passenger window operation only.

The power window system will operate any time the ignition is the ACC or RUN position. The power window system will also operate whenever the body control module (BCM) is in retained accessory power (RAP) mode. The DDM contains individual window switches for each of the power windows. All windows may be controlled UP and DOWN from the driver master control. When the DDM receives a request to operate a rear window from the driver master control, a GMLAN 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 signal to the appropriate rear window switch which will command the window motor as requested.

Each power window contains a reversible power window motor. The direction the window travels is dependent upon the polarity of the supply voltage. By reversing polarity of the supply voltage the window motor will move up or down.

Schematic Reference

Moveable Window Schematics

Door Control Module Schematics

Connector End View Reference

Window Systems Connector End Views

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Scan Tool Reference

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 is inoperative, refer to Driver Window Malfunction.

⇒	If the front passenger window is inoperative, refer to Passenger Window Malfunction.

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

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

⇒	If the parameter does not change, 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 reading should change between ON and OFF.

⇒	If the parameter does not change, replace the DDM.

Driver Power Window Malfunction

1. Ignition OFF, disconnect the C1 harness connector at the DDM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.

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

3. Ignition OFF, reconnect the harness connector at the DDM.
4. Ignition ON, observe the scan tool Driver Window Switch parameters while using the driver power window switch. The parameter should change between Off/Up/Down/Express Down.

⇒	If the parameter does not change, replace the DDM.

5. Ignition OFF, disconnect the harness connector at the driver window motor.
6. Test for less than 1 ohm between the control circuit terminal A and ground.

⇒	If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDM.

7. Test for less than 1 ohm between the control circuit terminal B and ground.

⇒	If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDM.

8. Connect a test lamp between control circuit terminal A and control circuit terminal B.
9. Ignition ON, command the driver window UP and DOWN by using the driver 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. If the circuits test normal, replace the DDM.

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

Passenger Power Window Malfunction

1. Ignition OFF, disconnect the C1 harness connector at the FPDM.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.

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

3. Ignition OFF, reconnect the harness connector at the FPDM.
4. Ignition ON, observe the scan tool Passenger Window Switch parameters while using the passenger power window switch. The parameter should change between Off/Up/Down/Express Down.

⇒	If the parameter does not change, replace the FPDM.

5. Ignition OFF, disconnect the harness connector at the passenger window motor.
6. Test for less than 1 ohm between the control circuit terminal A and ground.

⇒	If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the FPDM.

7. Test for less than 1 ohm between the control circuit terminal B and ground.

⇒	If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the FPDM.

8. Connect a test lamp between control circuit termina A and control circuit terminal B.
9. Ignition ON, command the passenger window UP and DOWN by using the passenger 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. If the circuits test normal, replace the FPDM.

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

Rear Power 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 F 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 G and ground.

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

4. Enable the rear windows by using the window lockout switch.
5. Test for more than 10 volts on the control circuit terminal D.

⇒	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.

6. Test for more than 10 volts on the signal circuit terminal C while commanding the rear window DOWN with a scan tool.

⇒	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. Test for more than 10 volts on the signal circuit terminal A while commanding the rear window UP with a scan tool.

⇒	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.

8. Ignition OFF, reconnect the rear window switch and disconnect the harness connector at the rear window motor.
9. Test for less than 5 ohms between the control circuit terminal A and ground.

⇒	If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the rear window switch.

10. Test for less than 5 ohms between the control circuit terminal B and ground.

⇒	If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the rear window switch.

11. Connect a test lamp between the control circuit terminal A and the control circuit terminal B.
12. 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. If the circuits test normal, replace the rear window switch.

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

Window Motor

1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
2. Install a 25 amp fused jumper wire between the control terminal A and 12 volts. Momentarily install a jumper wire between the control terminal B and ground. The window motor should perform the UP or DOWN function.

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

3. Reverse the jumper wires; the window motor should perform the DOWN or UP function.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.