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 a window switch is pressed on the driver window switch, 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 prohibiting the window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the passenger window motor or to the appropriate rear window switch which will perform the command as requested.
Each power window motor is controlled by their respective window switches. When a power window switch is activated to a desired position, power window switch will send a signal to its respective door window motor to move the window to the desired position.
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)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Verify DTC B3205 4B or B3210 4B is not set.
• If either DTC is set, refer to Window Regulator Motor Programming and Setup (Testing and Inspection)
2. Ignition ON, command the driver window to go 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 Front Window Motor Malfunction.
3. Command the driver window to go UP, DOWN, express UP and express DOWN by using the S79D 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.
4. While using the right front window switch on the S79D window switch-driver, observe the scan tool parameters listed below, each parameter should change from Inactive to Active:
* Front Passenger Main Control Down Switch
* Front Passenger Main Control Express Switch
* Front Passenger Main Control Up Switch
• If any of the values are always Inactive or always Active, refer to Driver Switches Malfunction.
5. While using the right rear window switch on the S79D window switch-driver, observe the scan tool parameters listed below, each parameter should change from Inactive to Active:
* Right Rear Main Control Down Switch
* Right Rear Main Control Express Switch
* Right Rear Main Control Up Switch
• If any of the values are always Inactive or always Active, refer to Driver Switches Malfunction.
6. While using the left rear window switch on the S79D window switch-driver, observe the scan tool parameters listed below, each parameter should change from Inactive to Active:
* Left Rear Main Control Down Switch
* Left Rear Main Control Express Switch
* Left Rear Main Control Up Switch
• If any of the values are always Inactive or always Active, refer to Driver Switches Malfunction.
7. Command the passenger window to go UP, DOWN, express UP and express DOWN with a scan tool. The passenger window should perform the UP, DOWN, express UP and express DOWN commands.
• If the passenger window does perform as specified, refer to Front Window Motor Malfunction.
8. Command the passenger window to go UP, DOWN, express UP and express DOWN by using the S79P window switch-passenger. The passenger window should perform the UP, DOWN, express UP and express DOWN commands.
• If the passenger window does perform as specified, refer to Passenger Window Switch Malfunction.
9. Command the right rear window to go UP and DOWN by using the S79RR window switch-right rear, the right rear window should perform the UP and DOWN function.
• If the right rear window does perform as specified, refer to Rear Window Malfunction.
10. Command the left rear window to go UP and DOWN by using the S79LR window switch-left rear, the left rear window should perform the UP and DOWN function.
• If the left rear window does perform as specified, refer to Rear Window Malfunction.
11. Observe the scan tool Window Lockout Switch parameter while pressing the window lockout switch on the S79D window switch-driver, the value should change from Inactive to Active each time the switch is pressed.
• If the value does not change, replace the S79D window switch-driver.
12. Observe the window lockout indicator while pressing the window lockout switch on the S79D window switch-driver, the indicator should turn ON and OFF each time the switch is pressed.
• If the indicator is always ON or always OFF, replace the S79D window switch-driver.
• If the indicator flashes ON and OFF, refer to Power Door Child Lock Malfunction (Power Door Child Lock Malfunction).
Circuit/System Testing
Front Window Motor Malfunction
1. Ignition OFF for, disconnect the harness connector at the appropriate front M74 window motor.
2. After 10 minutes, test for less than 30 ohm 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 front M74 window motor.
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 ohm 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 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. If all circuits test normal, replace the S79D window switch-driver.
Driver Switches Malfunction
1. Ignition OFF, disconnect the harness connector at the S79D window switch-driver.
2. 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.
3. 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.
4. If all circuits test normal, replace the S79D window switch-driver.
Passenger Window Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the S79P window switch-passenger.
2. Test for less than 30 ohm 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 the scan tool Passenger Window Switch at Door parameter is Inactive.
• If the value is Up, test the signal circuit terminal 8 for a short to ground. If the circuit tests normal, test or replace the M74P window motor-passenger.
• If the value is Down, test the signal circuit terminal 7 for a short to ground. If the circuit tests normal, test or replace the M74P window motor-passenger.
4. Connect a 3 A fused jumper wire between the signal circuit terminal 8 and ground, verify that the scan tool Passenger Window Switch at Door parameter is Up.
• 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 M74P window motor-passenger.
5. Connect a 3 A fused jumper wire between the signal circuit terminal 7 and ground, verify that the scan tool Passenger Window Switch at Door parameter is Down.
• 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 M74P window motor-passenger.
6. Test for greater than 10 V between the signal circuit terminal 6 and ground.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the M74P window motor-passenger.
7. If all circuits test normal, test or replace the S79P window switch-passenger.
Rear Window Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate S79R window switch-rear.
2. Test for less than 5 ohm between the ground circuit terminal 5 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 8 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 1 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 OFF, connect the harness connector at the S79R window switch-rear.
6. Disconnect the harness connector at the appropriate M74R window motor-rear.
7. 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, replace the S79R window switch-rear.
8. 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, replace the S79R window switch-rear.
9. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
10. Ignition ON, command the rear window UP and DOWN using the S79R window switch-rear. The test lamp should briefly 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, replace the S79R window switch-rear.
11. If all circuits test normal, test or replace the M74R window motor-rear.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate rear M74 window motor.
2. Install a 30 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 rear M74R window motor should perform the UP and DOWN functions.
• If it does not perform as specified, replace the rear M74 window motor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Side Door Window Switch Replacement (Front Side Door Window Switch Replacement)
* Rear Side Door Window Switch Replacement (Rear Side Door Window Switch Replacement)
* 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)