Power Window Switch: Description and Operation

PASSENGER DOOR WINDOW SWITCHES

Each passenger door has a separate power window switch mounted to it. In order to receive a signal from their respective switch, each passenger door module, PDM, LRDM, and RRDM, supplies battery voltage and ground to the associated power window switch. There are three circuits for battery voltage between each passenger door power window switch and the corresponding door module, one for an Up signal, one for a Down signal, and one for an Express signal. The door modules each supply ground to their switch via a fourth circuit. When the switch is activated for an Up or Down function, the normally open switch contacts for that function are closed and voltage flows through the switch, providing the associated door module with the necessary signal. When the switch is activated for the Express Up or Express Down function, two sets of switch contacts are closed, first the Up or Down contacts, and then the Express contacts.