Power Windows Malfunction (Express Down Malfunction)

Power Windows Malfunction (Express Down Malfunction)

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.

Diagnostic Fault Information





Circuit/System Description

When the drive power window switch is pressed momentarily in the down position past the first detent, the window will express down to the full open position when the switch is released. To cancel the express down operation, momentarily press the driver power window to the up position.

Diagnostic Aids

* The drivers power window switch is closed to ground in the rest position on both window terminals. When the switch is engaged one of the circuits switches to power completing the circuit.
* The power window actuators are bi-directional.
* The power window actuators have a time out circuit, which will open the circuit after power is supplied for more than 30 seconds.

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

Ignition ON, observe the drivers window, while pressing and releasing the down switch for the drivers window. The window should roll completely down on command.

Circuit/System Testing

1. Ignition ON, command the driver window UP and DOWN by pressing down and pulling up on the driver window switch. The driver window should roll down and up as commanded.

• If the driver window fails to roll down or up, Refer to Power Windows Malfunction.

2. Press AUTO past the first detent on the driver window switch and release, the driver window should roll completely down.

• If the window fails to roll completely down, test or replace the driver window switch.

Component Testing

Driver Window Switch
1. Ignition OFF, disconnect the harness connector at the driver window switch.
2. Test for infinite resistance between the signal terminals G and H and the B+ circuit terminal C with the driver window switch in the INACTIVE position.

• If less than infinite resistance, replace the driver window switch.

3. Test for less than 2 ohms of resistance between the signal terminal G and the B+ circuit terminal C with the driver window switch in the UP position.

• If greater than 2 ohms, replace the driver window switch.

4. Test for less than 2 ohms of resistance between the signal terminal H and the B+ circuit terminal C with the driver window switch in the DOWN position.
5. If greater than 2 ohms, replace the driver window switch

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Front Side Door Window Switch Replacement - Left Side (Front Side Door Window Switch Replacement - Left Side)
* Front Side Door Window Regulator Motor Replacement (Service and Repair)