Power Windows Malfunction
Power Windows Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The driver and passenger door lock and side window switches are integrated control module switch assemblies. The driver door switch (DDS) controls the passenger window through a GMLAN message to the passenger door switch (PDS). When a power window switch is activated in the up or down positions the DDS or PDS supplies power and ground to their respective window motor control circuits to drive the window motor in the required direction. The rear passenger power windows can also be operated from the DDS through a GMLAN message to the BCM. The rear passenger window switches on the DDS have 2 positions, up and down, their position is a direct input into the DDS. When the BCM receives a command to operate a rear window up or down the appropriate signal circuit to the rear door window switch.
Circuit/System Verification
1. Ignition ON, command driver power window UP and DOWN using the driver door switch, observe the operation of the driver window.
^ If the driver window is inoperative, refer to Driver Window Malfunction.
2. Command the front passenger power window UP and DOWN using the passenger door switch, observe the operation of the passenger window.
^ If the front passenger window is inoperative, refer to Passenger Window Malfunction.
3. Command the rear passenger power windows UP and DOWN with a scan tool, observe the operation of rear passenger power windows.
^ If either rear passenger power window is inoperative, refer to Rear Passenger Window Malfunction
4. Observe the scan tool Driver Window RF Switch, Driver Window LR Switch and Driver Window RR Switch parameters while using the driver master control switches. The reading should change between OFF/UP/DOWN/EXPRESS DOWN.
^ If the parameter does not change, replace the driver door switch.
5. Observe the scan tool Window Lockout Switch parameter while pressing and depressing the window lockout switch on the driver master control. The reading should change between ON and OFF.
^ If the parameter does not change, replace the driver door switch.
Circuit/System Testing
Driver Window Malfunction
1. Ignition OFF, disconnect the X1 harness connector at the DDS.
2. Test for less than 1.0 ohm between the ground circuit terminal 6 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 open/high resistance.
4. Ignition OFF, reconnect the harness connector at the DDS.
5. Ignition ON, observe the scan tool Driver Window Switch parameters while using the driver power window switch. The reading should change between OFF/UP/DOWN/EXPRESS DOWN.
^ If the parameter does not change, replace the DDS.
6. Ignition OFF, disconnect the harness connector at the driver window motor.
7. Connect a test lamp between control circuit terminal A and control circuit terminal B.
8. Ignition ON, command the driver window UP and DOWN by using the driver window switch. The test lamp should turn ON when commanding the UP and DOWN states.
^ If the test lamp is always OFF during either of the commands, test for a short to ground or open/high resistance on either control circuit. If the circuits test normal, replace the DDS.
^ If the test lamp is always ON, test for a short to voltage on either control circuit. If the circuits test normal, replace the DDS.
9. If all circuits test normal, test or replace the driver window motor.
Passenger Window Malfunction
1. Ignition OFF, disconnect the X1 harness connector at the PDS.
2. Test for less than 1.0 ohm between the ground circuit terminal 6 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 open/high resistance.
4. Ignition OFF, reconnect the harness connector at the PDS.
5. Ignition ON, observe the scan tool Passenger Window Switch parameters while using the passenger power window switch. The reading should change between OFF/UP/DOWN/EXPRESS DOWN.
^ If the parameter does not change, replace the PDS.
6. Ignition OFF, disconnect the harness connector at the passenger window motor.
7. Connect a test lamp between control circuit terminal A and control circuit terminal B.
8. Ignition ON, command the passenger window UP and DOWN by using the passenger window switch. The test lamp should turn ON when commanding the UP and DOWN states.
^ If the test lamp is always OFF during either of the commands, test for a short to ground or open/high resistance on either control circuit. If the circuits test normal, replace the PDS.
^ If the test lamp is always ON, test for a short to voltage on either control circuit. If the circuits test normal, replace the PDS.
9. If all circuits test normal, test or replace the passenger window motor.
Rear Passenger Window Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal F 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 G 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 more than 10 volts between the power window lockout rear control circuit terminal D and ground with the rear window lockout enabled on the driver master control.
^ If less than the specified range, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
5. Test for more than 10 volts between the power window switch rear down signal circuit terminal C and ground while commanding the appropriate rear window DOWN with a scan tool.
^ If less than the specified range, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
6. Test for more than 10 volts between the power window switch rear up signal circuit terminal A and ground while commanding the appropriate rear window UP with a scan tool.
^ If less than the specified range, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
7. Ignition OFF, reconnect the appropriate rear window switch and disconnect the harness connector at the appropriate rear window motor.
8. Connect a test lamp between control circuit terminal A and control circuit terminal B.
9. Ignition ON, command the appropriate rear window UP and DOWN by using the appropriate rear window switch. The test lamp should turn ON when commanding the UP and DOWN states.
^ If the test lamp is always OFF during either of the commands, test for a short to ground or open/high resistance on either control circuit. If the circuits test normal, replace the appropriate rear window switch.
^ If the test lamp is always ON, test for a short to voltage on either control circuit. If the circuits test normal, replace the appropriate rear window switch.
10. If all circuits test normal, test or replace the appropriate rear window motor.
Component Testing
1. Install a 25-amp fused jumper wire between the control terminal A and 12 volts. Momentarily install a jumper wire between the control terminal B and ground. The appropriate window motor should perform the UP or DOWN function.
^ If the function does not perform as specified, replace the appropriate window motor.
2. Reverse the jumper wires; the appropriate window motor should perform the DOWN or UP function.
^ If the function does not perform as specified, replace the appropriate window motor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Rear Side Door Window Regulator Motor Replacement (Power)
* Front Side Door Window Regulator Motor Replacement
* Rear Side Door Window Switch Replacement
* Door Lock and Side Window Switch Replacement - Driver Side
* Door Lock and Side Window Switch Replacement - Passenger Side