Power Windows Malfunction (Coupe)
Power Windows Malfunction (Coupe)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic procedure.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovide an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The front power windows are controlled by the driver door lock/window switch and passenger door lock/window switch. The driver door lock/window switch and passenger door lock/window switch each contain power window switches that are integrated into the module. The driver door lock/window switch contains the master power window switches that control both power window operations. The power window switch contained in the passenger door lock/window switch controls the front passenger window operation only.
When the driver power window switch is activated to a desired position, the driver door lock/window switch examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no prohibitive messages have been received, driver door lock/window switch will send a serial data message to the driver door window motor to move the window to the desired position.
When the driver door lock/window switch receives a request to operate the passenger window from the right front window switch, a serial data message is sent to the passenger door lock/window switch. The passenger door lock/window switch examines the request and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the passenger door lock/window switch will send a serial data message to the appropriate window motor to move the window as requested.
Reference Information
Schematic Reference
* Moveable Window Schematics Electrical Diagrams
* Door Control Module Schematics Door Control Module Schematics
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
Power Windows Description and Operation Power Windows
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module Referencesfor scan tool information
Circuit/System Verification
1. Ignition ON, observe the operation of the power windows while commanding each window UP and DOWN by using their respective window switches, each window should perform the UP and DOWN function.
• If the driver window malfunctions, perform the Circuit/System Testing.
• If the passenger window malfunctions, perform the Circuit/System Testing.
2. Observe the scan tool Driver Window RF Switch parameters while using the appropriate driver window switch. The parameter should change between Off/Up/Down/Express Up/Express Down.
• If the values do not change, replace the S84D door lock/window switch-driver.
3. Command the express up and express down functions of the driver and passenger door windows by pressing their window switches past the first detent and releasing and pulling their window switches past the first detent and releasing. The appropriate window should perform the express up and express down function.
• If the function does not perform as specified, refer to Window Motor Programming - Express Function Testing and Inspection.
Circuit/System Testing
1. Ignition OFF, disconnect the X1 harness connector at the appropriate S84 door lock/window switch.
2. Test for less than 30 ohm between the ground circuit terminal 6 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 4 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the X1 harness connector at the S84 door lock/window switch.
5. Ignition ON, observe the scan tool Window Switch parameters while using the power window switch on the S84 door lock/window switch. The parameter should change between Off, Up, Down, Express Up, and Express Down.
• If the value does not change, replace the S84 door lock/window switch.
6. Ignition OFF, disconnect the harness connector at the appropriate M74 window motor.
7. Test for less than 30 ohm between the ground circuit terminal 4 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
8. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
9. If all circuits test normal, replace the M74 window motor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Side Door Window Regulator Motor Replacement (Sedan/Wagon) Service and Repair
* Control Module References Control Module Referencesfor driver door lock/window switch and passenger door lock/window switch replacement, programming and setup