Power Windows Malfunction (A31/AN3/DL3)
Power Windows Malfunction (A31/AN3/DL3)
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. When a power window switch is activated in the up or down positions the driver door switch (DDS) supplies power and ground to the window motor control circuits to drive the window motor in the required direction. Prior to activating a power window motor the DDS will supply the control circuit with a low current bias voltage in order to determine that a short to ground condition does not exist and during window motor operation the DDS continues to monitor the motor current to verify proper window motor operation.
Circuit/System Verification
1. Observe the operation of the power windows while using their respective window switches, each window should perform the UP and DOWN command.
• If the driver window fails the UP/DOWN operation, refer to Driver Window Malfunction.
• If the front passenger window fails the UP/DOWN operation, refer to Passenger Window Malfunction.
• If a rear door window fails the UP/DOWN operation, refer to Rear Door Window Malfunction.
2. Disable the rear window switches by activating the window lockout switch on the driver master control. The rear window switches should be inoperative.
• If the rear window switches are still active, refer to Window Lockout Switch Malfunction.
3. Observe the operation of the power passenger windows while using the window switches on the driver master control. Each passenger window should perform the UP and DOWN command.
• If a window fails the UP/DOWN operation, refer to Driver Master Control Malfunction.
Circuit/System Testing
Driver Window Malfunction
1. Ignition OFF, disconnect the harness connector C1 at the DDS.
2. 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.
3. Ignition OFF, reconnect the harness connector C1 at the DDS and disconnect the harness connector at the driver window motor.
4. Connect a test lamp between control circuit terminal A and control circuit terminal B.
5. 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 remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the DDS.
6. If all circuits test normal, test or replace the driver window motor.
Driver Master Control Malfunction
Ignition ON, observe the scan tool Driver Window Switch parameters while using the appropriate power window switch on the driver master control. The reading should change between OFF/UP/DOWN/EXPRESS.
If the scan tool Driver Window Switch parameter is always OFF, replace the DDS.
If the scan tool Driver Window Switch parameter is always UP, DOWN or EXPRESS, replace the DDS.
Passenger Window Malfunction
1. Ignition OFF, disconnect the harness connector C1 at the PDS.
2. 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.
3. Ignition OFF, reconnect the harness connector C1 at the PDS and disconnect the harness connector at the passenger window motor.
4. Connect a test lamp between control circuit terminal A and control circuit terminal B.
5. 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 remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the PDS.
6. If all circuits test normal, test or replace the passenger window motor.
Rear Door Window Inoperative
1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Ignition OFF, test for less than 1.0 ohm of resistance 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. Connect a test lamp between the power window switch rear down signal circuit terminal C and ground.
5. Command the appropriate rear window DOWN with a scan tool, the test lamp should illuminate during the DOWN command.
• If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
6. Connect a test lamp between the power window switch rear up signal circuit terminal A and ground.
7. Ignition ON, command the appropriate rear window UP with a scan tool, the test lamp should illuminate during the UP command.
• If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
8. Ignition OFF, reconnect the appropriate rear window switch.
9. Ignition OFF, disconnect the harness connector at the appropriate rear window motor.
10. Connect a test lamp between control circuit terminal A and control circuit terminal B.
11. 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 remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the appropriate rear window switch.
12. If all circuits test normal, test or replace the appropriate rear window motor.
Window Lockout Switch Malfunction
1. Ignition ON, observe the scan tool Window Lockout Switch parameter while pressing the window lockout switch on the driver master control. The reading should change between ON and OFF.
• If the scan tool Window Lockout Switch parameter is always OFF, replace the DDS.
• If the scan tool Window Lockout Switch parameter is always ON, replace the DDS.
2. Ignition OFF, disconnect the Power Window Lockout Rear control circuit at the appropriate rear window switch.
3. Ignition ON, connect a test lamp between the Power Window Lockout Rear Control circuit terminal D and ground.
4. Command the rear window lockout ON and OFF by pressing the lockout switch on the driver master control. The test lamp should go ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to B+, if the circuit tests normal, replace the BCM.
• 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, replace the BCM.
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 (Crew Cab) Rear Side Door Window Regulator Motor Replacement (Extended Cab)
* Front Side Door Window Regulator Motor Replacement
* Rear Side Door Window Switch Replacement (Extended Cab) Rear Side Door Window Switch Replacement (Crew Cab)
* Control Module References for BCM replacement, setup and programming Programming and Relearning