Circuit/System Description

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The front and rear power windows are controlled by the driver door module and passenger door module. The driver door module and passenger door module each contain power window switches that are integrated into the module. The driver door module contains the master power window switch that controls all power window operations. The driver door module supplies the left rear power window switch with a 12 volt reference and signal circuit. The power window switch contained in the passenger door module controls the front passenger window operation only. The passenger door module 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 driver door module examines the request and checks for messages from other vehicle control modules prohibiting window movement. If no prohibitive messages have been received, the driver door module will send a serial data message to the driver door window motor to move the window to the desired position.

When the driver door module receives a request to operate one of the right side passenger windows from the driver master control, a serial data message is sent to the passenger door module. The passenger door module 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 serial data message to the appropriate window motor to move the window as requested.

The driver door module and passenger door module 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 serial data message to the appropriate power window motor commanding the requested window position.