Power Windows Malfunction RPO Z75

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

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

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

When the driver door lock/window switch 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

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 driver door lock/window switch.

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 driver door lock/window switch.

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 Motor Programming - Express Function.

Front Window Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the appropriate door lock/window switch.
2. Test for less than 15 ohms 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 lock/window switch.
5. Ignition ON, observe the scan tool Driver LF Window Switch parameters while using the driver window switch and the scan tool Passenger Window Switch parameters while using the passenger window switch. The parameters should change between Off, Up, Down, Express Up, and Express Down.

⇒	If the value does not change between commanded states, replace the door lock/window switch.

6. Ignition OFF, disconnect the harness connector at the window motor.
7. Test for less than 15 Ω 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 Passenger Window Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Test for less than 10 Ω 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.

Note: Verify the rear windows are enabled by pressing the rear window lockout switch on the driver master control.

4. Test for greater than 9V 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 9V between the signal circuit terminal C and ground 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.

6. Test for greater than 9V between the signal circuit terminal A and ground 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.

7. Ignition OFF, connect the harness connector at 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.

Power Windows Malfunction RPO X88/Z88

The driver and passenger door lock and side window switches are integrated control module switch assemblies. The driver door lock/window switch controls the passenger window through a serial data message to the passenger door lock lock/window switch. When a power window switch is activated in the up or down positions the driver door lock/window switch or passenger door lock lock/window switch supplies power and ground to their respective window motor control circuits to drive the window motor in the required direction. The rear passenger power windows can also be operated from the driver door lock/window switch through a serial data message to the BCM. The rear passenger window switches on the driver door lock/window switch have 2 positions, up and down, their position is a direct input into the driver door lock/window switch. When the BCM receives a command to operate a rear window up or down, the appropriate signal is sent to the rear door window switch which will command the window motor to perform the up or down function.

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. Each power window motor is internally circuit breaker protected.

Schematic Reference

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 Driver Window Malfunction.

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

⇒	If either rear passenger power window malfunctions, 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 and Express Down.

⇒	If the value does not change, replace the driver door lock/window switch.

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, replace the driver door lock/window switch.

Driver Window Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the driver door lock/window switch.
2. Test for less than 15 Ω 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 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.

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

⇒	If the value does not change, replace the driver door lock/window switch.

6. Ignition OFF, disconnect the harness connector at the driver window motor.
7. Connect a test lamp between control circuit terminal A and control circuit terminal B.
8. 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 or open/high resistance. If the circuits test normal, replace the driver door lock/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 driver door lock/window switch.

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

Passenger Window Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the passenger door lock/window switch.
2. Test for less than 15 Ω 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 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.

4. Ignition OFF, connect the X1 harness connector at the passenger door lock/window switch.
5. 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 and Express Down.

⇒	If the value does not change, replace the passenger door lock/window switch.

6. Ignition OFF, disconnect the harness connector at the passenger window motor.
7. Ignition ON, test for less than 1 Ω 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 passenger door lock/window switch.

8. Test for less than 1 Ω 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 passenger door lock/window switch.

9. Connect a test lamp between control circuit terminal A and control circuit terminal B.
10. Command the passenger window UP and DOWN by using the passenger door lock/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 passenger door lock/window switch.

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

Rear Passenger Window Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Test for less than 10 Ω 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.

Note: Verify the rear windows are enabled by pressing the rear window lockout switch on the driver master control.

4. Test for greater than 9V 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 9V between the signal circuit terminal C and ground 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.

6. Test for greater than 9V between the signal circuit terminal A and ground 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.

7. Ignition OFF, connect the harness connector at 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.

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.