• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Linear Interconnect Network Bus 1 | U1500 02 | U1511¹ | U1500 01 | -- |
Linear Interconnect Network Bus 2 | U1500 02 | U1512² | U1500 01 | -- |
Battery Positive Voltage | U1511³, U1512³ | U1511³, U1512³ | -- | -- |
Ground | -- | U1511³, U1512³ | -- | -- |
¹ Driver door module uses LIN bus 1 circuit. ² Passenger door module uses LIN bus 2 circuit. ³ Either or both DTC may set depending on the location of the open/high resistance. |
The driver door module (DDM) and the front passenger door module (FPDM) communicate with window regulator motors on the local interconnect network bus 1 and the local interconnect network bus 2 circuits respectively. 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.
The system voltage is between 9-16 volts.
The DTC will set when there is an open/high resistance in the local interconnect network bus circuit, or an open in the voltage or ground circuits of the motor.
When there is a short to ground in the local interconnect network bus circuit.
When there is a short to voltage in the local interconnect network bus circuit.
No window on the specific side of the vehicle will operate if the open is before the first splice from the door module, and both DTC should set. If open after the first splice, the individual window will be inoperative and a single DTC should set.
The individual LIN bus will be inoperative, disabling all windows on one side of the vehicle.
• | The current DTC will clear when the malfunction is no longer present. |
• | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
• | A window regulator motor may cause a short to the local interconnect network bus circuit, and will cause all windows on one side to be inoperative. |
• | An open/high resistance between the door module and the first splice from the module will cause all windows on one side to be inoperative. |
• | An open/high resistance between the window regulator motor and the first splice from the motor will cause only one window to be inoperative. |
• | Use the DMM MIN/MAX function to capture/locate intermittent conditions. |
Data Link Communications Description and Operation
Control Module References for Scan Tool Information
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
⇒ | 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. |
⇒ | If the parameter displays Not Normalized, refer to Window Regulator Motor Programming and Setup . |
⇒ | 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. |
Important: Each window regulator motor or front window and door lock switch, if replaced needs to be setup for proper operation.
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for window, and door lock switch (door module) or window regulator motor replacement, setup, and programming