Power Windows Malfunction
Power Windows 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
The front and rear power windows are controlled by the driver door module (DDM) and front passenger door module (PDM). The DDM and PDM each contain power window switches that are integrated into the module. The DDM contains the master power window switch that controls all power window operations. The DDM supplies the left rear power window switch with a 12-volt reference and signal circuit. The power window switch contained in the PDM controls the front passenger window operation only. The PDM supplies the right rear power window switch with a 12-volt reference and signal circuit.
When the driver power window switch is activated to a desired position, the DDM examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no prohibitive messages have been received, the DDM will send a LIN serial data message to the driver door window motor to move the window to the desired position.
When the DDM receives a request to operate one of the right side passenger windows from the driver master control, a GMLAN serial data message is sent to the PDM. The PDM examines the request and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the PDM will send a LIN serial data message to the appropriate window motor to move the window as requested.
The DDM and PDM supply their respective rear power window switches with a 12-volt reference and signal circuit. The rear power window switches contain separate resistors for each switch position. When a rear power window switch is activated, the associated door control module interprets the signal and checks for messages from other vehicle control modules prohibiting the window movement. If no prohibitive messages have been received, the door control module sends a LIN serial data message to the appropriate power window motor commanding the requested window position.
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)
Scan Tool Reference
Programming and Relearning (Programming and Relearning) for Scan Tool Information
Circuit/System Verification
1. Ignition ON, observe the scan tool DDM LF Window Switch, RF Window Switch, LR Window Switch, and RR Window Switch parameters. Verify the parameter cycles between Off, Up, Down, Express Up, and Express Down while operating the applicable switch.
• If the parameter does not cycle between the specified values, replace the DDM.
2. Observe the scan tool FPDM Passenger Window Switch parameter. Verify the parameter cycles between Off, Up, Down, Express Up, and Express Down while operating the switch
• If the parameter does not cycle between the specified values, replace the FPDM.
3. Observe the scan tool DDM Window Lockout Switch parameter. The parameter should cycle between On and Off while cycling the window lockout switch.
• If the parameter does not cycle between the specified values, replace the DDM.
4. Operate each of the vehicle windows using the driver and passenger door window switches. Each window should perform the appropriate Up/Down function.
• If any window does not perform the commanded Up/Down function, refer to Door Window Motor Circuit Malfunction.
5. Operate each of the rear windows using the appropriate rear window switch. Each window should perform the appropriate Up/Down function.
• If any window does not perform the commanded Up/Down function, refer to Rear Window Switch Circuit Malfunction.
Circuit/System Testing
Door Window Motor Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
2. Ignition OFF, test for less than 2.0 ohms of resistance between the ground circuit terminal 4 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 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 6.0-7.0 volts between the LIN circuit terminal 6 and ground.
• If greater than the specified range, test the LIN circuit for a short to voltage. If the circuit tests normal, replace the applicable door module.
• If less than the specified range, test the LIN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the applicable door module.
5. Ignition OFF, reconnect the harness connector at the window motor.
6. Ignition ON, observe the appropriate scan tool Window Motor Fault Status parameter while raising and lower the window. The parameter should read No Fault.
• If the parameter reads Motor Fault, Hall Fault, Memory Fault, LIN Fault, Anti-Trap Fault or Thermo Active, test or replace the appropriate power window motor.
7. If all circuits test normal, replace the appropriate door module.
Rear Window Switch Circuit Malfunction
1. Ignition OFF, disconnect the harness connector at the applicable rear door window switch.
2. Ignition ON, test for B+ between the reference voltage circuit terminal 3 and ground.
• If less than the specified value, test the reference voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate door module.
3. Ignition OFF, reconnect the harness connector at the rear door window switch. Disconnect the harness connector X2 at the appropriate door module.
4. With the switch in the at-rest position, test for 8.0K-9.0K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
• If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, test or replace the appropriate rear door window switch.
5. With the switch in the AUTO DOWN position, test for 2.75K-3.75K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
• If not within the specified range, test or replace the appropriate rear door window switch.
6. With the switch in the DOWN position, test for 5.25K-6.25K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
• If not within the specified range, test or replace the appropriate rear door window switch.
7. With the switch in the UP position, test for 1.9K-2.9K ohms of resistance between the voltage reference circuit terminal 16 and the signal circuit terminal 14.
• If not within the specified range, test or replace the appropriate rear door window switch.
8. If all circuits test normal, replace the appropriate door module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Rear Side Door Window Switch Replacement (Rear Side Door Window Switch Replacement)
* Rear Side Door Window Regulator Motor Replacement (Service and Repair)
* Front Side Door Window Regulator Motor Replacement (Service and Repair)
* Programming and Relearning (Programming and Relearning) for DDM and FPDM replacement, setup, and programming