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 window motor supplies 12 V signal circuits to the driver window switch, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0 V. The driver window motor will detect the voltage drop in the signal circuit and will command the window to move in the desired direction.
The driver window master control switch also contains control switches for the passenger, left rear and right rear window functions. When a window switch is pressed, a serial data message is sent to the Body Control Module (BCM). The BCM examines the request and checks for messages from other power window motors that may prohibit window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the appropriate passenger or rear window switch which will perform the command as requested.
Diagnostic Aids
The loss of the express up and express down functions for the driver window may have occurred for the following reasons:
* The battery was disconnected
* The battery was replaced
* The door wiring harness was disconnected
* The window motor was disconnected
The driver window motor will need to be normalized in order to restore the express functions, refer to Window Motor Programming - Express Function Testing and Inspection for the proper procedure.
Reference Information
Schematic Reference
Moveable Window Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
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 Programming and Relearning for scan tool information
Circuit/System Verification
1. Vehicle in Service Mode.
2. Verify the driver window functions while commanding the Driver Window Motor Up and Down with a scan tool.
• If the window does not move UP and DOWN as commanded
Refer to Circuit/System Testing - Driver Window Motor Malfunction.
• If the window moves UP and DOWN as commanded
3. Verify the driver window moves while commanding the window UP and DOWN with the driver window switch.
• If the window does not move UP and DOWN as commanded
Refer to Circuit/System Testing - Driver Window Switch Malfunction.
• If the window moves UP and DOWN as commanded
4. Verify the driver window performs the express UP and express DOWN functions with the driver window switch.
• If the driver window does not express UP or express DOWN
Normalize the driver window motor, refer to Window Motor Programming - Express Function Testing and Inspection.
1. Verify the driver window performs the express UP and express DOWN functions with the driver window switch
• If the driver window does not express UP or express DOWN
Refer to Circuit/System Testing - Driver Window Switch Malfunction.
• If the driver window performs the express UP and express DOWN functions
5. Verify the scan tool parameters listed below change when pressing and pulling the switches for the passenger, left rear and right rear window on the driver window master control;
* Left Rear Main Control Down Switch - Inactive and Active
* Left Rear Main Control Express Switch - Inactive and Active
* Left Rear Main Control Up Switch - Inactive and Active
* Right Rear Main Control Down Switch - Inactive and Active
* Right Rear Main Control Express Switch - Inactive and Active
* Right Rear Main Control Up Switch - Inactive and Active
* Front Passenger Main Control Down Switch - Inactive and Active
* Front Passenger Main Control Express Switch - Inactive and Active
* Front Passenger Main Control Up Switch - Inactive and Active
• If any parameter does not change
Refer to Circuit/System Testing - Driver Window Switch Malfunction.
• If the parameters change
6. Verify the scan tool Child Security Lockout Switch parameter changes between Inactive and Active when pressing the window lockout switch.
• If the parameters do not change
Refer to Power Door Child Lock Malfunction Power Door Child Lock Malfunction
• If the parameters changes
7. Verify the lockout indicator turns ON and OFF when commanding the Child Security Lock Indicator On and Off with a scan tool.
• If the indicator does not turn ON and OFF
Replace the S79D window switch-driver.
• If the indicator turns ON and OFF
8. Verify the passenger, left rear and right rear window functions while commanding the Passenger Window Motor, Left Rear Window Motor and Right Rear Window Motor Up and Down with a scan tool.
• If the window does not move UP and DOWN as commanded
Refer to Circuit/System Testing - Passenger Power Window Inoperative.
• If the window moves UP and DOWN as commanded
9. Command the rear window lockout by pressing the window lockout switch on the driver window switch.
10. Verify the left rear and right rear window does not move while commanding the window UP and DOWN with the left rear window switch and right rear window switch.
• If a rear window moves UP and DOWN as commanded
Refer to Power Door Child Lock Malfunction Power Door Child Lock Malfunction.
• If the rear windows do not move UP and DOWN
11. All OK.
Circuit/System Testing
Driver Window Motor Malfunction
1. Vehicle OFF, disconnect the harness connector at the M74D window motor-driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.
• If 10 ohms or greater
1. Vehicle OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Vehicle in Service Mode.
4. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Vehicle OFF.
2. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Vehicle OFF.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the M74D window motor-driver.
• If the test lamp illuminates
5. Test for 5-10 V between the serial data circuit terminal 4 and ground
• If less than 5 V
1. Vehicle OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the serial data circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the serial data circuit end to end.
• If 2 ohms or greater, repair the open/high resistance on the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
1. Vehicle OFF, disconnect the harness connector at the K9 body control module, Vehicle in Service Mode.
2. Test for less than 1 V between the serial data circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If between 5-10 V
6. Test or replace the M74D window motor-driver.
Driver Window Switch Malfunction
1. Vehicle OFF, disconnect the harness connector at the S79D window switch-driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.
• If 10 ohms or greater
1. Vehicle OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Vehicle in Service Mode.
4. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Vehicle OFF.
2. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Vehicle OFF.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79D window switch-driver
• If the test lamp illuminates
5. Test for 5-10 V between the serial data circuit terminal 5 and ground
• If less than 5 V
1. Vehicle OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the serial data circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the serial data circuit end to end.
• If 2 ohms or greater, repair the open/high resistance on the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
1. Vehicle OFF, disconnect the harness connector at the K9 body control module, Vehicle in Service Mode.
2. Test for less than 1 V between the serial data signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If between 5-10 V
6. Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.
• If not Inactive
1. Vehicle OFF, disconnect the harness connector at the M74D window motor-driver.
2. Test for infinite resistance between the signal circuit terminal 3 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the M74D window motor-driver.
• If Inactive
7. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 1.
8. Verify the scan tool Driver Window Main Control Down Switch parameter is Active
• If not Active
1. Vehicle OFF, disconnect the harness connector at the M74D window motor-driver, Vehicle in Service Mode.
2. Test for less than 1 V between the signal circuit terminal 7 and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the M74D window motor-driver.
• If Active
9. Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.
• If not Inactive
1. Vehicle OFF, disconnect the harness connector at the M74D window motor-driver.
2. Test for infinite resistance between the signal circuit terminal 6 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the M74D window motor-driver.
• If Inactive
10. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the ground circuit terminal 1.
11. Verify the scan tool Driver Window Main Control Up Switch parameter is Active
• If not Active
1. Vehicle OFF, disconnect the harness connector at the M74D window motor-driver, Vehicle in Service Mode.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the M74D window motor-driver.
• If Active
12. Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.
• If not Inactive
1. Vehicle OFF, disconnect the harness connector at the M74D window motor-driver.
2. Test for infinite resistance between the signal circuit terminal 2 and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the M74D window motor-driver.
• If Inactive
13. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.
14. Verify the scan tool Driver Window Main Control Express Switch parameter is Active
• If not Active
1. Vehicle OFF, disconnect the harness connector at the M74D window motor-driver, Vehicle in Service Mode.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the M74D window motor-driver.
• If Active
15. Test or replace the S79D window switch-driver.
Passenger Power Window Inoperative
1. Vehicle OFF, disconnect the harness connector at the appropriate passenger or rear S79 window switch. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:
* S79P window switch-passenger - ground circuit terminal 1
* S79LR window switch-left rear - ground circuit terminal 5
* S79RR window switch-right rear - ground circuit terminal 5
• If 10 ohms or greater
1. Vehicle OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Vehicle in Service Mode.
4. Verify a test lamp illuminates between the B+ circuit terminal listed below and ground:
* S79P window switch-passenger - B+ circuit terminal 4
* S79LR window switch-left rear - B+ circuit terminal 8
* S79RR window switch-right rear - B+ circuit terminal 8
• If the test lamp does not illuminate and the circuit fuse is good
1. Vehicle OFF.
2. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Vehicle OFF.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79 window switch
• If the test lamp illuminates
5. Test for 5-10 V between the serial data circuit terminal listed below and ground
* S79P window switch-passenger - serial data circuit terminal 5
* S79LR window switch-left rear - serial data circuit terminal 1
* S79RR window switch-right rear - serial data circuit terminal 1
• If less than 5 V
1. Vehicle OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the serial data circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the serial data circuit end to end.
• If 2 ohms or greater, repair the open/high resistance on the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
1. Vehicle OFF, disconnect the harness connector at the K9 body control module, Vehicle in Service Mode.
2. Test for less than 1 V between the serial data signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module
• If between 5-10 V
6. Vehicle OFF, connect the harness connector at the S79 window switch and disconnect the harness connector at the M74 window motor.
7. Test for less than 5 ohms between the control circuit terminal A and ground.
• If 5 ohms or greater
1. Vehicle OFF, disconnect the harness connector at the S79 window switch.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79 window switch.
• If less than 5 ohms
8. Test for less than 5 ohms between the control circuit terminal B and ground.
• If 5 ohms or greater
1. Vehicle OFF, disconnect the harness connector at the S79 window switch.
2. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the S79 window switch.
• If less than 5 ohms
9. Connect a test lamp between control circuit terminal A and control circuit terminal B, Vehicle in Service Mode.
10. Verify the test lamp turns ON when commanding the UP and DOWN states with the S79 window switch.
• If the test lamp remains OFF during either of the commands
1. Vehicle OFF, disconnect the harness connector at the S79 window switch.
2. Test for infinite resistance between each control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the S79 window switch.
• If the test lamp turns ON during each of the commands
11. Test or replace the M74 window motor.
Component Testing
Passenger Window Motor
1. Vehicle OFF, disconnect the harness connector at the appropriate passenger or rear M74 window motor.
2. Install a 25 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 the function does not perform the UP and DOWN functions
Replace the passenger or rear M74 window motor.
• If the function performs the UP and DOWN functions
3. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
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