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Power Windows Malfunction




Power Windows Malfunction

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 driver side window consists of a driver window switch and a window motor capable of express up and express down functions. When the driver window switch is pressed or pulled, the voltage within the appropriate signal circuit drops and the window motor will then perform the commanded function.

The driver power window switch contains individual window switches for each of power windows. All windows may be controlled up and down from the driver power window switch. The individual 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.

Battery voltage is supplied to the power window switch through the accessory voltage supply circuit. The power window switch also receives a constant ground source. The power window motor control circuits are connected to ground through the normally closed up and down contacts of the power window switch. When the power switch is placed in the down position, the power window motor down control circuit is switched to 12 V and is applied to the down side of the power window motor. Since the other side of the power motor is connected to ground through the normally closed contacts of the up switch, the window travels down. By placing the power window switch in the up position, the polarity of the power window motor is reversed and the window travels up.

Diagnostic Aids

A window motor that has not been normalized will no longer perform the express up and express down functions, this may occur during the following conditions:

* When a window motor has been disconnected

* When a door harness has been disconnected

* When the battery has been disconnected or replaced

To normalize the window motor refer to Window Motor Programming - Express Function Testing and Inspection.

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

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, command the driver window UP, DOWN, express UP and express DOWN with a scan tool. The driver window should perform the UP, DOWN, express UP and express DOWN commands.

• If the driver window does perform as specified, refer to Driver Window Motor Malfunction.

2. Command the driver window UP, DOWN, express UP and express DOWN by using the window switch-driver. The driver window should perform the UP, DOWN, express UP and express DOWN commands.

• If the driver window does perform as specified, refer to Driver Window Switch Malfunction.

3. Command the passenger, left rear and right rear window UP and DOWN using the appropriate switch on the driver window switch and by using the passenger, left rear and right rear window switches. The each window should perform the UP and DOWN functions from each switch.

• If a passenger or rear window functions from their local window switch but is inoperative from the driver window switch, test or replace the S79D window switch-driver.

• If the passenger window functions from the driver window switch but not from the passenger window switch, refer to Passenger Window Switch Malfunction.

• If the passenger window is inoperative from both the driver and passenger window switch, refer to Passenger Window Inoperative.

• If a rear window functions from the driver window switch but not from a local rear window switch, refer to Rear Window Switch Malfunction.

• If a rear window is inoperative from both the driver window switch and the local rear window switch, refer to Rear Window Inoperative.

4. Disable and enable the rear window door switches by pressing and depressing the lockout switch on the driver door lock/window switch. The rear door power window switches should be enabled and disabled when changing between the commanded states.

• If one or both rear window switches continue to function while disabled, refer to Rear Window Switch Malfunction.

Circuit/System Testing

Driver Window Motor Malfunction

1. Ignition OFF, disconnect the harness connector at the M74D window motor-driver.

2. Test for less than 10 ohms between the ground circuit terminal 1 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. Test for 5-10 V between the serial data circuit terminal 4 and ground.

• If greater than the specified range, test the serial data circuit for a short to voltage.

• If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance.

5. If all circuits test normal, test or replace the M74D window motor-driver.

Driver Power Window Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the S79D window switch-driver.

2. Test for less than 5 ohms between the ground circuit terminal 11 and ground.

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

3. Ignition ON, verify that the scan tool Driver Window Main Control Down Switch parameter is Inactive.

• If not the specified value, test the control circuit terminal 8 for a short to ground. If the circuit tests normal, test or replace the M74D window motor-driver.

4. Connect a 5 A fused jumper wire between the control circuit terminal 8 and ground, verify that the scan tool Driver Window Main Control Down Switch parameter is Active.

• If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the M74D window motor-driver.

5. Verify that the scan tool Driver Window Main Control Up Switch parameter is Inactive.

• If not the specified value, test the control circuit terminal 9 for a short to ground. If the circuit tests normal, test or replace the M74D window motor-driver.

6. Connect a 5 A fused jumper wire between the control circuit terminal 9 and ground, verify that the scan tool Driver Window Main Control Up Switch parameter is Active.

• If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the M74D window motor-driver.

7. Verify that the scan tool Driver Window Main Control Express Switch parameter is Inactive.

• If not the specified value, test the control circuit terminals listed below for a short to ground. If the circuit tests normal, test or replace the M74D window motor-driver.

* Control terminal 7

* Control terminal 10

8. Connect a 5 A fused jumper wire between the control circuit terminal listed below and ground, verify that the scan tool Driver Window Main Control Express Switch parameter is Active.

* Control terminal 7

* Control terminal 10

• If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the M74D window motor-driver.

9. If all circuits test normal, test or replace the S79D window switch-driver.

Passenger Window Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the S79P window switch-passenger.

2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.

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

3. If all circuits test normal, test or replace the S79P window switch-passenger.

Passenger Window Inoperative

1. Ignition OFF, disconnect the harness connector at the S79P window switch-passenger.

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 S79D window switch-driver.

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 S79D window switch-driver.

4. Connect a test lamp between the signal circuit terminal 3 and signal circuit terminal 6.

5. Ignition ON, command the passenger window UP and DOWN using the S79D window switch-driver. 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 either signal circuit for a short to ground. If the circuits test normal, test or replace the S79D window switch-driver.

6. Ignition OFF, connect the harness connector at the S79P window switch-passenger.

7. Disconnect the harness connector at the M74P window motor-passenger.

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 S79P window switch-passenger.

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 S79P window switch-passenger.

10. Connect a test lamp between the control circuit terminal A and control circuit terminal B.

11. Ignition ON, command the passenger window UP and DOWN using the S79P window switch-passenger. 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 either control circuit for a short to ground. If the circuits test normal, test or replace the S79P window switch-passenger.

12. If all circuits test normal, test or replace the M74P window motor-passenger.

Rear Window Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 window switch.

2. Connect a test lamp between the control circuit terminal 5 and ground.

3. Ignition ON, command the rear window lockout ON and OFF by pressing and depressing the lockout switch on the S79D window switch-driver. 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 S79D window switch-driver.

• 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 S79D window switch-driver.

4. If all circuits test normal, test or replace the rear S79 window switch.

Rear Window Inoperative

1. Ignition OFF, disconnect the harness connector at the S79D window switch-driver.

2. Test for less than 10 ohms between the ground circuit terminal 11 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 6 and ground.

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

4. Ignition OFF, connect the harness connector at the S79D window switch-driver.

5. Disconnect the harness connector at the appropriate rear S74 window switch.

6. 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 S79D window switch-driver.

7. 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 S79D window switch-driver.

8. Connect a test lamp between the signal circuit terminal 3 and the signal circuit terminal 6.

9. Ignition ON, command the rear window UP and DOWN by using the S79D window switch-driver. 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 S79D window switch-driver.

10. Ignition OFF, connect the harness connector at the rear S79 window switch.

11. Disconnect the harness connector at the rear M74 window motor.

12. 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 rear S79 window switch.

13. 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.

14. Connect a test lamp between the control circuit terminal A and control circuit terminal B.

15. Ignition ON, command the rear window UP and DOWN 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 either control circuit for a short to ground. If the circuits test normal, test or replace the rear S79 window switch.

16. If all circuits test normal, test or replace the rear M74 window motor.

Component Testing

Driver Window Switch

1. Ignition OFF, disconnect the harness connector at the S79D window switch-driver.

2. With the switch in the INACTIVE position, test for infinite resistance between the control terminals listed below and the ignition terminal 12:

* Control terminal 7

* Control terminal 9

* Control terminal 13

* Control terminal 14

• If less than the specified value, replace the S79D window switch-driver.

3. With the switches in the UP positions, test for less than 2 ohms between the control terminals listed below and the ignition terminal 12:

* Control terminal 9

* Control terminal 14

• If greater than the specified range, replace the S79D window switch-driver.

4. With the switches in the DOWN position, test for less than 2 ohms between the control terminals listed below and the ignition terminal 12:

* Control terminal 7

* Control terminal 13

• If greater than the specified range, replace the S79D window switch-driver.

Passenger Window Switch

1. Ignition OFF, disconnect the harness connector at the S79P window switch-passenger.

2. Test for infinite resistance between the control terminals 4 and 1 and the ignition terminal 5 with the switch in the INACTIVE position.

• If less than the specified value, replace the S79P window switch-passenger.

3. Test for less than 2 ohms between the ignition terminal 5 and the control terminal 1 with the switch in the UP position.

• If greater than the specified range, replace the S79P window switch-passenger.

4. Test for less than 2 ohms between the ignition terminal 5 and the control terminal 4 with the switch in the DOWN position.

• If greater than the specified range, replace the S79P window switch-passenger.

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 4 and 1 and the control terminal 5 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 5 and the control terminal 1 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.

Passenger/Rear Window Motor

1. Ignition OFF, disconnect the harness connector at the appropriate passenger or rear 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 repair.

* Front Side Door Window Regulator Motor Replacement Service and Repair

* Front Side Door Window Switch Replacement (Left Side) Front Side Door Window Switch Replacement (Left Side)Front Side Door Window Switch Replacement (Right Side) Front Side Door Window Switch Replacement (Right Side)

* Rear Side Door Window Regulator Motor Replacement Service and Repair

* Rear Side Door Window Switch Replacement Rear Side Door Window Switch Replacement

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