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 in the ACC or RUN position. The power window system will also operate whenever the body control module (BCM) is in the retained accessory power (RAP) mode. The driver power window switch contains individual window switches for each of the power windows. All windows may be controlled up and down from the driver master control. 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.
Circuit/System Verification
1. Ignition ON, command the each window UP and DOWN using the appropriate window switch on the driver master control and the appropriate passenger door window switch. Each window should perform the UP and DOWN functions from each switch.
^ 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 door window switches by activating the window lockout switch on the driver master control. The rear door window switches should be inoperative.
^ If the rear door window switches are still active, refer to Window Lockout Switch Malfunction.
3. Command the express down function of the driver door window by pressing down on the driver's window switch past the first detent and releasing. The driver's window should roll completely down.
^ If the function does not perform as specified, replace the driver window switch.
Circuit/System Testing
Driver Power Window Inoperative
1. Ignition OFF, disconnect the X2 harness connector at the driver window switch.
2. Test for less than 1 ohm 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 X2 harness connector 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 illuminate when commanding the UP and DOWN states.
^ If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or open/high resistance. If the circuits test normal, replace the driver window switch.
^ If the test lamp is always ON, test either control circuit for a short to voltage. 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. Test for less than 1 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 on the signal circuit terminal C while commanding the passenger window DOWN using the RF window switch on the driver master control.
^ If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the driver window switch.
5. Test for more than 10 volts on the signal circuit terminal A while commanding the passenger window UP using the RF window switch on the driver master control.
^ If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the driver window switch.
6. Ignition OFF, connect the harness connector passenger window switch and 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 illuminate when commanding the UP and DOWN states.
^ If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or open/high resistance. If the circuits test normal, replace the passenger window switch.
^ If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the passenger window switch.
9. 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. 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. Enable the rear window switches by using the window lockout switch.
5. Test for more than 10 volts on the control circuit terminal D.
^ 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 driver window switch.
6. Test for more than 10 volts on the signal circuit terminal C while commanding the rear window DOWN using the window switch on the driver master control.
^ If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the driver window switch.
7. Test for more than 10 volts on the signal circuit terminal A while commanding the rear window UP using the window switch on the driver master control.
^ If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the driver window switch.
8. Ignition OFF, connect the harness connector at rear window switch and disconnect the harness connector at the rear window motor.
9. Connect a test lamp between control circuit terminal A and control circuit terminal B.
10. Ignition ON, command the rear window UP and DOWN by using the rear window switch. The test lamp should illuminate when commanding the UP and DOWN states.
^ If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or open/high resistance. If the circuits test normal, replace the rear window switch.
^ If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the rear window switch.
11. If all circuits test normal, test or replace the rear window motor.
Window Lockout Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Disable the rear window switches by using the window lockout switch on the driver master control.
3. Test for 0 volts on the control circuit terminal D.
^ If greater than the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the driver window switch.
Component Testing
Window Motor
1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
2. 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 window motor should perform the UP or DOWN function.
^ If the function does not perform as specified, replace the window motor.
3. Reverse the jumper wires; the window motor should perform the DOWN or UP function.
^ If the function does not perform as specified, replace the window motor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Rear Side Door Window Switch Replacement (Crew Cab) Rear Side Door Window Switch Replacement (Extended Cab)
* Front Side Door Window Regulator Motor Replacement
* Front Side Door Window and Rear Side Door Window Switch Replacement (with DL8 and without SLT)
* Rear Side Door Window Regulator Motor Replacement (Extended Cab) Rear Side Door Window Regulator Motor Replacement (Crew Cab)
* Door Lock and Side Window Switch Replacement - Driver Side
* Door Lock and Side Window Switch Replacement - Passenger Side