Power Windows Malfunction (AXG)
Power Windows Malfunction (AXG)
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.
When the driver wishes to command a passenger or rear window, a window switch is pressed on the driver window switch. A serial data message is then sent to the body control module (BCM) from the driver window switch. The BCM will examine the request and check for messages from other power window switches that may prohibit the window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the passenger or rear window switch which will command the window motor to perform as requested.
Diagnostic Aids
If the driver window is not performing the express up and express down functions, this may indicate that it has not been normalized. This may occur during the following conditions:
* When the driver window motor has been disconnected
* When the driver door harness has been disconnected
* When the battery has been disconnected or replaced
To normalize the driver 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 Sunshade - Left (DH6)
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 window motor-driver UP, DOWN, express UP and express DOWN with a scan tool. The window motor-driver should perform the UP, DOWN, express UP and express DOWN commands.
• If the window motor-driver does perform as specified, refer to Driver Window Motor Malfunction.
2. Command the window motor-driver UP, DOWN, express UP and express DOWN by using the window switch-driver. The window motor-driver should perform the UP, DOWN, express UP and express DOWN commands.
• If the window motor-driver does perform as specified, refer to Driver Window Switch Malfunction.
3. Observe the scan tool Left Rear Main Control Down Switch, Left Rear Main Control Express Switch, Left Rear Main Control Up Switch, Right Rear Main Control Down Switch, Right Rear Main Control Express Switch, Right Rear Main Control Up Switch, Front Passenger Main Control Down Switch, Front Passenger Main Control Express Switch, and the Front Passenger Main Control Up Switch parameters while using the appropriate switches on the window switch-driver. Each value should change from Inactive to Active as the switch is used.
• If the values do not change or if the value is No Communication, refer to Driver Window Switch Malfunction.
4. Command the passenger and rear windows UP and DOWN with a scan tool, each window should perform the UP and DOWN functions while changing between the commanded states.
• If a window does not perform as specified, refer to Passenger/Rear Window Malfunction.
Circuit/System Testing
Driver Window Motor Malfunction
1. Ignition OFF for, disconnect the harness connector at the M74D window motor-driver.
2. After 10 minutes, 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 the circuit tests normal, replace the K9 BCM.
• If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
5. If all circuits test normal, replace the M74D window motor-driver.
Driver Window Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the S79D window switch-driver.
2. After 10 minutes, test for less than 30 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 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. Test for 5-10 V between the serial data circuit terminal 5 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. Ignition ON, verify that the scan tool Driver Window Main Control Down Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, replace the M74D window motor-driver.
6. Connect a 3 A fused jumper wire between the signal circuit terminal 7 and ground. Verify that the scan tool Driver Window Main Control Down Switch parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74D window motor-driver.
7. Verify that the scan tool Driver Window Main Control Up Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 8 for a short to ground. If the circuit tests normal, replace the M74D window motor-driver.
8. Connect a 3 A fused jumper wire between the signal circuit terminal 8 and ground. Verify that the scan tool Driver Window Main Control Up Switch parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74D window motor-driver.
9. Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the M74 driver window motor.
10. Connect a 3 A fused jumper wire between the signal circuit terminal 6 and ground, verify the scan tool Driver Window Main Control Express Switch parameter is Active.
• If not the specified value, test the signal circuit terminal for a short to voltage or an open/high resistance. If the circuit tests normal, replace the M74 driver window motor.
11. If all circuits test normal, replace the S79D window switch-driver.
Passenger/Rear Window Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate passenger or rear S79 window switch.
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 3
* S79LR window switch-left rear ground circuit terminal 5
* S79RR window switch-right rear ground circuit terminal 5
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Igniton ON, verify that 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, test the ground circuit for a short to ground or an open/high resistance.
4. 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 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. Ignition OFF, connect the harness connector at the S79 window switch and disconnect the harness connector at the appropriate M74 window motor.
6. Test for less than 15 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, replace the appropriate S79 window switch.
7. Test for less than 15 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, replace the appropriate S79 window switch.
8. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
9. Ignition ON, command the M74 window motor UP and DOWN by using the S79 window switch. The test lamp should briefly illuminate during the UP and DOWN commands.
• If the test lamp does not illuminate during the UP or DOWN command, test either control circuit for a short to ground. If the circuits tests normal, replace the S79 window switch.
10. If all circuits test normal, test or replace the M74 window motor.
Component Testing
Passenger/Rear Window Motor
1. Ignition OFF, disconnect the harness connector at the appropriate 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 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 and Multifunction Switch Replacement (Drivers Side Door) Front Side Door Window and Multifunction Switch Replacement (Drivers Side Door)
* Rear Side Door Window Regulator Motor Replacement Service and Repair
* Rear Side Door Window Switch Replacement Rear Side Door Window Switch Replacement
* Front Side Door Window Switch Replacement (Passengers Side Door) Front Side Door Window Switch Replacement (Passengers Side Door)