Power Windows Malfunction (Driver and Rear)
Power Windows Malfunction (Driver and Rear)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
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 BCM is in RAP mode. The door lock window switch contains individual window switches for each power window. All windows may be controlled up and down from the door lock window switch. The individual rear passenger power window switches will only control the up and down operation of their respective power window.
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.
Reference Information
Schematic Reference
Moveable Window Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Power Windows Description and Operation Power Windows
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Circuit/System Verification
1. Ignition ON, command driver window UP and DOWN using the appropriate switch on the door lock/window switch. The driver window should perform the UP and DOWN functions.
• If the driver window does not perform as specified, refer to Driver Window Malfunction.
2. Command left rear and right rear window UP and DOWN using the appropriate switch on the door lock/window switch and by using the window switch-left rear and the window switch-right rear. The each rear window should perform the UP and DOWN functions from each switch.
• If both rear windows are inoperative, refer to Both Rear Windows Inoperative.
• If a rear window is inoperative from a local rear window switch, refer to Rear Window Inoperative From Rear Window Switch.
• If a rear window is inoperative from the door lock/window switch and the local rear window switch, refer to Rear Window Inoperative from Both Door Lock/Window Switch and Rear Window Switch.
3. Disable and enable the rear window switches by pressing and depressing the lockout switch on the door lock/window switch. The rear window switches should be enabled and disabled when changing between the commanded states.
• If both rear window switches continue to function while disabled, refer to Rear Window Inoperative From Rear Window Switch.
Circuit/System Testing
Driver Window Malfunction
1. Ignition OFF, disconnect the X2 harness connector at the S101 door lock/window switch.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X2 harness connector at the S101 door lock/window switch.
4. Disconnect the harness connector at the K90 window control module.
5. Test for less than 10 ohms between the ground circuit terminal 5 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 8 and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Connect a test lamp between the signal circuit terminal 6 and ground.
8. Command the driver window UP by using the S101 door lock/window switch. The test lamp should illuminate during the UP command.
• If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the S101 door lock/window switch.
• If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the S101 door lock/window switch.
9. Connect a test lamp between the signal circuit terminal 12 and ground.
10. Command the driver window DOWN by using the S101 door lock/window switch. The test lamp should illuminate during the DOWN command.
• If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the S101 door lock/window switch.
• If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the S101 door lock/window switch.
11. Ignition OFF, connect the harness connector at the K90 window control module.
12. Disconnect the harness connector at the M74D window motor-driver.
13. Ignition ON, connect a test lamp between the control circuit terminal A and control circuit terminal B.
14. Command the driver window UP and DOWN by using the window switch on the S101 door lock/window switch. The test lamp should illuminate during the UP and DOWN command.
• If the test lamp is always OFF during either for the commands, test either control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K90 window control module.
• If the test lamp is always ON, test either signal circuit for a short to voltage. If the circuit tests normal, test or replace the K90 window control module.
15. If all circuits test normal, test or replace the M74D window motor-driver.
Both Rear Windows Inoperative
1. Ignition OFF, disconnect the X1 harness connector at the S101 door lock/window switch.
2. Test for less than 10 ohms between the ground circuit terminal 9 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 ignition circuit terminal 10 and ground.
• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, test or replace the S101 door lock/window switch.
Rear Window Inoperative From Rear Window Switch
1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 window switch.
2. Connect a test lamp between the control circuit terminal 4 and ground.
3. Ignition ON, command the rear window lockout ON and OFF by pressing and depressing the lockout switch on the S101 door lock/window switch. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the S101 door lock/window switch.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the S101 door lock/window switch.
4. If all circuits test normal, test or replace the rear S79 window switch.
Rear Window Inoperative from Both Door Lock/Window Switch and Rear Window Switch
1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 window switch.
2. Test for less than 10 ohms between the signal circuit terminal 3 and ground.
• If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the S101 door lock/window switch.
3. Test for less than 10 ohms between the signal circuit terminal 6 and ground.
• If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the S101 door lock/window switch.
4. Connect a test lamp between the signal circuit terminal 3 and the signal circuit terminal 6.
5. Ignition ON, command the rear window UP and DOWN by using the S101 door lock/window switch. The test lamp should illuminate when commanding the UP and DOWN states.
• If the test lamp does not illuminate during either of the commands, test both signal circuits for a short to ground. If the circuits test normal, test or replace the S101 door lock/window switch.
6. Ignition OFF, connect the harness connector at the rear S79 window switch.
7. Disconnect the harness connector at the rear M74 window motor.
8. Test for less than 10 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, test or replace the S79 window switch.
9. Test for less than 10 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, test or replace the rear S79 window switch.
10. Connect a test lamp between the control circuit terminal A and the control circuit terminal B.
11. Ignition ON, command the rear window UP and DOWN by using the rear S79 window switch. The test lamp should illuminate when commanding the UP and DOWN states.
• If the test lamp does not illuminate during either of the commands, test both control circuits for a short to ground. If the circuits test normal, test or replace the rear S79 window switch.
12. If all circuits test normal, test or replace the rear M74 window motor.
Component Testing
Door Lock/Window Switch
1. Ignition OFF, disconnect the X1 and X2 harness connectors at the S101 door lock/window switch.
2. Test for less than 2 ohms between the control terminal 11 and the ignition terminal 10 with the lockout switch in the ENABLE position.
• If greater than the specified value, replace the S101 door lock/window switch.
3. Test for infinite resistance between the control terminal 11 and the ignition circuit terminal 10 with the lockout switch in the DISABLE position.
• If less than the specified value, replace the S101 door lock/window switch.
4. With the switch in the INACTIVE position, test for infinite resistance between the control terminals listed below and the ignition terminal 10:
* Control terminal 8
* Control terminal 7
* Control terminal 12
* Control terminal 13
• If less than the specified value, replace the S101 door lock/window switch.
5. With the switch in the UP position, test for less than 2 ohms between the control terminals listed below and the ignition terminal 10:
* LR window switch control terminal 8
* RR window switch control terminal 13
• If greater than the specified range, replace the S101 door lock/window switch.
6. With the switch in the DOWN position, test for less than 2 ohms between the control terminals listed below and the ignition terminal 10:
* LR window switch control terminal 7
* RR window switch control terminal 12
• If greater than the specified range, replace the S101 door lock/window switch.
Rear Window Switch
1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 window switch.
2. Test for infinite resistance between the control terminals 1 and 5 and the control terminal 4 with the switch in the INACTIVE position.
• If less than the specified value, replace the rear S79 window switch.
3. Test for less than 2 ohms between the control terminal 1 and the control terminal 4 with the switch in the UP position.
• If greater than the specified range, replace the rear S79 window switch.
4. Test for less than 2 ohms between the control terminal 5 and the control terminal 4 with the switch in the DOWN position.
• If greater than the specified range, replace the rear S79 window switch
Window Motor
1. Ignition OFF, disconnect the harness connector at the appropriate M74 window motor.
2. Install a 20 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M74 window motor should perform the UP and DOWN functions.
• If it does not perform as specified, replace the M74 window motor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
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