Power Windows System Controls: Notes

The power window switches are located on the driver's door armrest. In addition, each door has a switch for its own window. The front power window switch operates with two positions for both up and down movement and the rear power window switch operates with one position for up and two positions for down movement. Press the switch to the first position to lower the window to the desired level. Pull the switch up to raise the window. The vehicle has Retained Accessory Power (RAP) that allows you to use the power windows once the ignition has been turned off. The DDM and the PDM communicate over the GMLAN serial data line. The DDM and PDM communicate with the Rear Window switches and all the window motors over a Linear Interconnect Network (LIN) to perform the system functions. The functions of UP, Down, Express-Up or Express-Down are controlled by messages sent over the LIN buss from the window switches to the logic portion of the window motor assemblies. Power is provided from the 25 A circuit breaker to the window motors when the ignition is ON or if the vehicle is in RAP. An internal switched Ground is supplied by the window motor when commanded by a LIN message. The DDM and PDM store trouble codes for faults in the power window system. If a fault code is set the power window operation function may be inhibited. It is necessary to use a scan tool to check for power window system fault codes. There are no Driver Information Center (DIC) or Instrument Panel Cluster (IPC) telltales or warning for these faults.