Power Windows Malfunction (A31 w/o AN3, DL3)
Power Windows Malfunction (A31 w/o 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 power window system will operate any time the ignition is the ACC or RUN position. The power window system will also operate whenever the body control module (BCM) is in retained accessory power (RAP) mode. The driver power window switch contains individual window switches for each of power windows. All windows may be controlled up and down from the driver power window switch. The individual passenger power window switches will only control the up and down operation of their respective power window.
Each power window contains a reversible power window motor. The direction the window travels is dependent upon the polarity of the supply voltage. By reversing polarity of the supply voltage the window motor will move up or down. Each power window motor is internally circuit breaker protected.
Battery voltage is supplied to each power window switch through the accessory voltage supply circuit. The power window switch also receives a constant ground source. The power window motor control circuits are connected to ground through the normally closed up and down contacts of the power window switch. When the power switch is placed in the down position, the power window motor down control circuit is switched to 12 volts and is applied to the down side of the power window motor. Since the other side of the power motor is connected to ground through the normally closed contacts of the up switch, the window travels down. By placing the power window switch in the up position, the polarity of the power window motor is reversed and the window travels up.
The drivers window switch has express-up and express-down features that allows the window to be raised and lowered completely without holding the switch. Press the front of the switch part way and release it and the drivers window will open a small amount. Press the switch down all the way and release it and the window will go completely down automatically.
Circuit/System Verification
1. Ignition ON, command the appropriate door window UP and DOWN by using the appropriate window switch. Observe the operation of the appropriate door windows.
• If the front driver door window is inoperative, refer to Driver Power Window Inoperative.
• If the front passenger door window is inoperative, refer to Passenger Power Window Inoperative.
• If the left rear or right rear door window is inoperative, refer to Rear Power Window Inoperative.
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. Command the express down and express up functions of the driver door window by pressing down on the drivers window switch past the first detent and releasing. The driver's window should roll completely down and completely up.
• If the drivers window fails to roll completely down, replace the driver window switch.
Circuit/System Testing
Driver Power Window Inoperative
1. Ignition OFF, disconnect the harness connector C2 at the driver window switch.
2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal A 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 H 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 the harness connector C2 at the driver window switch, disconnect the harness connector at the driver window motor.
5. Connect a test lamp between control circuit terminal A and control circuit terminal B.
6. Command the driver window UP and DOWN by using the driver window switch. The test lamp should turn illuminate when commanding the UP and DOWN states.
• If the test lamp remains 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 driver window switch.
7. If all circuits test normal, test or replace the driver window motor.
Passenger Power Window Inoperative
1. Ignition OFF, disconnect the harness connector at the passenger window switch.
2. Ignition OFF, test for less than 1 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 passenger window switch passenger down signal circuit terminal C and ground.
5. Ignition ON, command the passenger window DOWN by using the RF window switch on the driver master control. The test lamp should illuminate during the DOWN command.
• If the test lamp is always OFF, test for a short to ground on the signal circuit. If the circuits test normal, replace the driver window switch.
6. Connect a test lamp between the passenger window switch passenger up signal circuit terminal A and ground.
7. Command the passenger window UP by using the RF window switch on the driver master control. The test lamp should illuminate during the UP command.
• If the test lamp is always OFF, test for a short to ground on the signal circuit. If the circuits test normal, replace the driver window switch.
8. Ignition OFF, connect the passenger window switch and disconnect the harness connector at the passenger window motor.
9. Connect a test lamp between control circuit terminal A and control circuit terminal B.
10. 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 or open/high resistance on either control circuit. If the circuits test normal, replace the passenger window switch.
11. If all circuits test normal, test or replace the passenger window motor.
Rear Power 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. Ignition ON, command the appropriate rear window DOWN by using the appropriate window switch on the driver master control. The test lamp should illuminate during the DOWN command.
• If the test lamp is always OFF, test for a short to ground or open/high resistance on the signal circuit. If the circuits test normal, replace the driver window switch.
6. Connect a test lamp between the power window switch rear up signal circuit terminal A and ground.
7. Command the appropriate rear window UP by using the appropriate window switch on the driver master control. The test lamp should illuminate during the UP command.
• If the test lamp is always OFF, test for a short to ground or open/high resistance on the signal circuit. If the circuits test normal, replace the driver window switch.
8. Ignition OFF, reconnect the appropriate rear window switch.
9. Ignition OFF, disconnect the power window lockout rear control circuit at the appropriate rear window switch.
10. Ignition OFF, disconnect the harness connector at the appropriate rear window motor.
11. Connect a test lamp between control circuit terminal A and control circuit terminal B.
12. Ignition ON, command the appropriate rear window UP and DOWN by using the appropriate rear window switch. The test lamp should turn illuminate 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.
13. Reconnect the window master switch lockout circuit at the appropriate rear window switch.
14. Command the appropriate rear window UP and DOWN by pressing the appropriate rear window switch. The test lamp should turn illuminate when commanding the UP and DOWN states.
• If the test lamp remains OFF during either of the commands, test the window master switch lockout circuit for a short to ground. If the circuits test normal, replace the driver window switch.
15. 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 driver window switch.
• If the scan tool Window Lockout Switch parameter is always ON, replace the driver window switch.
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 driver window switch.
• 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 driver window switch.
Component Testing
Window Motor
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 Switch Replacement (Extended Cab) Rear Side Door Window Switch Replacement (Crew Cab)
* Front Side Door Window Regulator Motor Replacement