Passenger Seat Switch: Operation

The passenger seat switch has up to three momentary switch buttons. The heated seat switch portion of the switch is back-lit with Light-Emitting Diodes (LED) for easy visibility. When any of the switch buttons are depressed, a resistance signal is sent to the Passenger Door Module (PDM) via hard wired connections. The passenger door module then sends the request to the Memory Heated Seat Adjustable Pedal Module (MHSAPM) via the PCI data bus circuit. The MHSAPM is responsible for controlling the 12volt battery source and ground path to the seat heating elements or power seat track mounted motors to control the seat accordingly.

Fig 1: Identifying CS Passenger Seat Switch

Courtesy of DAIMLERCHRYSLER CORP.

Any seat axis or seat heat inputs can be activated at the same time (except contradictory inputs). The passenger door module has two outputs to the seat switch to indicate heat level (HI/LO). The power seat system is operational in any ignition switch position. The heated seat system only operates with the ignition on. See the owner's manual in the vehicle glove box for more information on the seat switch functions and the seat adjusting procedures.