Front Seats - System Operation and Component Description

DSM

The driver seat control switch and power memory seat motors are hard-wired to the DSM. The DSM controls the operation of the power memory seat. The DSM communicates on the Medium Speed Controller Area Network (MS-CAN). PMI is required when a new DSM is installed. The DSM hard stop/soft stops must be set/reset any time a new DSM, driver seat track or horizontal motor is installed.

Memory Set Switch

The memory set switch contains 3 momentary contact switches. It is hard-wired to the DDM and is used to recall each memory position stored in the DSM.

Driver Seat Track - With Memory

There are 3 front seat track bi-directional motors present on power seat tracks. The horizontal (fore/aft) front seat track motor is the only seat track motor which can be serviced separately from the seat track assembly. All other seat track motors (front height, rear height) are serviced as part of the seat track assembly. Each seat track motor contains a Hall-effect sensor which provides seat track position information to the DSM for setting/obtaining desired preset seat memory positions. The seat track motors move the power seat forward/backward and up/down depending on the polarity of voltage supplied from the DSM.

Seat Track - Without Memory

There are 3 front seat track bi-directional motors present on power seat tracks. The horizontal (fore/aft) front seat track motor is the only seat track motor which can be serviced separately from the seat track assembly. All other seat track motors (front height, rear height) are serviced as part of the seat track assembly. The seat track motors move the power seat forward/backward and up/down depending on the polarity of voltage supplied from the seat control switch.

FDIM

If equipped with climate controlled seats, the FDIM (touchscreen) contains climate controlled seat control buttons.

FCIM

If equipped with climate controlled seats, the FCIM contains climate controlled seat buttons. PMI is required when a new FCIM is installed.

SCME

If equipped with climate controlled seats, The SCME controls the operation of the climate controlled seat system. PMI is required when a new SCME is installed.

Blower Motor

If equipped with climate controlled seats, the seat cushion and backrest are each equipped with a blower motor assembly that includes a seat blower (Thermo-Electric Device (TED) and fan motor, serviced as an assembly). There is also a temperature sensor (thermistor) in each blower motor which provides feedback to the SCME. The blower motor assembly is controlled by the SCME.

Front Seat Power Lumbar Assembly

The front seat power lumbar assembly is mounted to the backrest (serviced as an assembly).

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