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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

When the ignition switch is in the RUN or ACCY position, or retained accessory power is enabled and the driver or passenger window switch is pressed in the down position, voltage is applied to the appropriate window motor causing that window to open. When the driver or passenger window switch is pulled in the up position, voltage is applied to the appropriate window motor in the opposite direction causing that window to close.

The driver window switch contains a rear window lockout switch which disconnects the voltage supply to both rear window switches, disabling them. The left rear and right rear switches on the driver window switch will continue to function the rear windows normally.

Diagnostic Aids

The power window fuse may open when all windows are simultaneously commanded UP and DOWN repeatedly by using all four switches. This will cause the windows to become inoperative with no trouble found.

Reference Information
Schematic Reference

Moveable Window Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
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 the driver window UP and DOWN using the S79D window switch-driver. The driver window should perform the UP and DOWN functions.

• If the driver window does not perform the UP or DOWN function, refer to Driver Window Malfunction.

2. Command each passenger and rear window UP and DOWN using the appropriate switches on the S79D window switch-driver and by using the 79P window switch-passenger, S79LR window switch-left rear and S79RR window switch-right rear. Each window should perform the UP and DOWN functions from each switch.

• If the passenger window does not perform as specified, refer to Front Passenger Window Malfunction.
• If either rear window does not perform as specified, refer to Rear Window Malfunction.

3. Disable and enable the rear S79 window switch by pressing and depressing the lockout switch on the S79D window switch-driver. The S79LR window switch-left rear and S79RR window switch-right rear should be enabled and disabled when changing between the commanded states.

• If the S79LR window switch-left rear and S79RR window switch-right rear continue to function while disabled, refer to Lockout Switch Malfunction.

4. Except RPO AXG, command the express down function of the M74D window motor-driver by pressing the appropriate switch S79D window switch-driver on the past the first detent and releasing. The driver window should perform the express down function.

• If the function does not perform as specified, replace the S79D window switch-driver.

5. For RPO AXG, command the express up and express down function of the M74D window motor-driver by pressing and pulling the appropriate switch on the S79D window switch-driver past the first detent and releasing. The driver window should perform the express up and express down function.

• If the function does not perform as specified, refer to Power Window Reinitialization (Programming and Relearning).

Circuit/System Testing

Driver Window Malfunction (Except RPO AXG)
1. Ignition OFF, disconnect the X1 harness connector at the S79D window switch-driver.
2. Test for less than 10 ohm between the ground circuit terminal B 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 E 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 X1 harness connector at the S79D window switch-driver and disconnect the harness connector at the M74D window motor-driver.
5. Connect a test lamp between the control circuit terminal A and ground.
6. Ignition ON, command the driver window DOWN by using the S79D window switch-driver. The test lamp should illuminate when commanding the DOWN state.

• 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.

• 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.

7. Connect a test lamp between the control circuit terminal B and ground.
8. Command the driver window UP by using the S79D window switch-driver. The test lamp should illuminate when commanding the UP state.

• 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.

• 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.

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

Driver Window Malfunction (RPO AXG)
1. Ignition OFF, disconnect the X1 harness connector at the S79D window switch-driver.
2. Test for less than 10 ohm between the ground circuit terminal B 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 E 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 S79D window switch-driver and disconnect the harness connector at the M74D window motor-driver.
5. Test for less than 10 ohm between the ground circuit terminal 4 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 B+ circuit terminal 6 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ fuse is open, replace the M74D window motor-driver.

7. Verify that a test lamp illuminates between the ignition circuit terminal 3 and ground.

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

8. Connect a test lamp between the control circuit terminal 1 and ground.
9. Ignition ON, command the driver door window DOWN by using the S79D window switch-driver. The test lamp should illuminate when commanding the DOWN state.

• 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.

• 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.

10. Connect a test lamp between the control circuit terminal 2 and ground.
11. Command the driver door window UP by using the S79D window switch-driver. The test lamp should illuminate when commanding the UP state.

• 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.

• 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.

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

Front Passenger Window 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 A and ground.

• If the test lamp does not illuminate, test the ignition circuit for an open/high resistance

3. Ignition OFF, test for less than 5 ohm between the control circuit terminal H 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 S79D window switch-driver.

4. Test for less than 5 ohm between the control circuit terminal D 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 S79D window switch-driver.

5. Connect a test lamp between the control circuit terminal D and control circuit terminal H.
6. Ignition ON, command the front passenger door window UP and DOWN by using the right front switch on 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 control circuits for a short to ground. If the circuits test normal, test or replace the S79D window switch-driver.

7. Ignition OFF, connect the harness connector at the S79P window switch-passenger and disconnect the harness connector at the M74P window motor-passenger.
8. Test for less than 5 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, test or replace the S79P window switch-passenger.

9. Test for less than 5 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, 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 front passenger door 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 Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 window switch.

Note: Verify the rear S79 window switch is enabled by checking the lockout switch on the S79D window switch-driver.

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

• If the test lamp does not illuminate, 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.

3. Ignition OFF, test for less than 5 ohm between the control circuit terminal D 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 S79D window switch-driver.

4. Test for less than 5 ohm between the control circuit terminal H 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 S79D window switch-driver.

5. Connect a test lamp between the control circuit terminal D and control circuit terminal H.
6. Ignition ON, command the rear window UP and DOWN using the appropriate switch on 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 control circuits for a short to ground. If the circuits test normal, test or replace the S79D window switch-driver.

7. Ignition OFF, connect the harness connector at the rear S79 window switch and disconnect the harness connector at the rear M74 window motor.
8. Test for less than 5 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, test or replace the rear S79 window switch.

9. Test for less than 5 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, test or replace the rear S79 window switch.

10. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
11. 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 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.

Lockout 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 A and ground.
3. 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.

Component Testing

Driver Window Switch
1. Ignition OFF, disconnect the harness connector at the S79D window switch-driver.
2. Test for less than 2 ohm between the lockout control terminal F and the B+ terminal E with the lockout switch in the ENABLE position.

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

3. Test for infinite resistance between the lockout control terminal F and the B+ terminal E with the lockout switch in the DISABLE position.

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

4. With the switch in the INACTIVE position, test for infinite resistance between the control terminals listed below and the B+ terminal E:

* Left rear window switch control terminals D and C
* Right rear window switch control terminals G and H
* Right front window switch control terminals B and C
* Left front window switch control terminals A and E

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

5. With the switch in the UP position, test for less than 2 ohm between the control terminals listed below and the B+ terminal E:

* Left rear window switch control terminal D
* Right rear window switch control terminal G
* Right front window switch control terminal B
* Left front window switch control terminal E

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

6. With the switch in the DOWN position, test for less than 2 ohm between the control terminals listed below and the B+ terminal E:

* Left rear window switch control terminal C
* Right rear window switch control terminal H
* Right front window switch control terminal C
* Left front window switch control terminal A

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

Front 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 G and F and the B+ terminal A 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 ohm between the control terminal G and the B+ terminal A 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 ohm between the control terminal F and the B+ terminal A with the switch in the DOWN position.

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

Rear Passenger 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 G and F and the control terminal A 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 ohm between the control terminal G and the control terminal A 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 ohm between the control terminal F and the control terminal A 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 20A 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 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.

* Front Side Door Window Regulator Motor Replacement (Front Side Door Window Regulator Motor Replacement)
* Rear Side Door Window Regulator Motor Replacement (Rear Side Door Window Regulator Motor Replacement)
* Rear Side Door Window Switch Replacement (Rear Side Door Window Switch Replacement)
* Front Side Door Window Switch Replacement - Right Side (Front Side Door Window Switch Replacement - Right Side)
* Front Side Door Window Switch Replacement - Left Side (Front Side Door Window Switch Replacement - Left Side)

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