Power Windows Malfunction (Panel Van)
Power Windows Malfunction (Panel Van)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
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 master power window switch contains individual window switches for each power window. Both windows are controlled up and down from the master power window switch. 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.
Reference Information
Schematic Reference
Moveable Window Schematics ([1][2]Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Power Windows Description and Operation (Power Windows Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Circuit/System Verification
1. Ignition ON, command the appropriate door window UP and DOWN by pressing the appropriate Window switch. Observe the operation of the appropriate door windows.
2. Ignition ON, command the express down function door window by pressing Auto on the Master Window Switch past the first detent and releasing. The drivers window should roll completely down.
• If the drivers window fails to roll completely down, replace the Master Window Switch.
Circuit/System Testing
1. Ignition OFF, disconnect the B+ harness connector at the Master Window Switch.
2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal 8 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 1 and ground.
• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the PWR WINDW fuse is open, check the B+ circuit for a short to ground. If the circuit tests normal, replace the BCM.
4. If all circuits test normal, test or replace the Master Window Switch.
5. Ignition OFF, reconnect the harness connector at the Master Window Switch.
6. Ignition OFF, disconnect the harness connector at the appropriate Window Motor.
7. Ignition OFF, connect a test lamp between control circuit terminal A and control circuit terminal B.
8. Ignition ON, command the appropriate door window UP and DOWN by pressing the appropriate window control on the Master 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 of the control circuits, if the circuit tests normal, test or replace the Master Window switch.
9. If all circuits test normal, test or replace the appropriate Window Motor.
Component Testing
Master Window Switch
1. Ignition OFF, disconnect the harness connector at the Master Window switch.
2. Test for infinite resistance between the signal terminals 7 and 6 and the B+ circuit terminal 1 with the Front Passenger Switch in the INACTIVE position.
• If less than infinite resistance, replace the Master Window switch.
3. Test for less than 2 ohms between the signal terminal 7 and the B+ circuit terminal 1 with the switch in the UP position.
• If greater than 2 ohms, replace the Master Window switch.
4. Test for less than 2 ohms between the signal terminal 6 and the B+ circuit terminal 1 with the switch in the DOWN position.
5. If greater than 2 ohms, replace the Master Window switch.
6. Test for infinite resistance between the signal terminals 12 and 11 and the B+ circuit terminal 1 with the Driver Switch in the INACTIVE position.
• If less than infinite resistance, replace the Master Window switch.
7. Test for less than 2 ohms between the signal terminal 12 and the B+ circuit terminal 1 with the switch in the UP position.
• If greater than 2 ohms, replace the Master Window switch.
8. Test for less than 2 ohms between the signal terminal 11 and the B+ circuit terminal 1 with the switch in the DOWN position.
9. If greater than 2 ohms, replace the Master Window switch.
Window Motor
1. Install a 30-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 (Verification Tests) after completing the diagnostic procedure.
* Front Side Door Window Switch Replacement (Front Side Door Window Switch Replacement)
* Front Side Door Window Regulator Motor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming