Component Description For Driver Seat Control Unit - GF91.29-P-5231GR

MODEL 166 up to model year 2016 with CODE 275 (Memory package (driver seat, steering column, mirrors))

Shows model 166.0

Fig 1: Driver Seat Control Unit Component Location - Model 166 Up To MY 2016 With/Without Code 275

Courtesy of MERCEDES-BENZ USA

Location

The driver seat control unit is located at the bottom of the driver seat frame.

Task

The driver seat control unit controls the following functions:

Seat and steering column adjustment
Easy entry/exit
Memory function for seat, outside mirrors and steering column
Collision avoidance with bench seat in rear

The tasks are subdivided as follows:

Reading in of sensors and signals
Evaluation of input factors
Actuation of components
Transmitting signals

Reading in of sensors and signals

The input factors are read in via the following connections:

Direct line
Interior CAN (CAN B)

Direct line

The signals from the following sensors are read via direct lines:

Steering column in/out Hall sensor (M20/1b1)
Steering column up/down Hall sensor (M20/2b1)
Seat fore/aft adjustment Hall sensor, driver seat (M27/1b1)
Height adjustment Hall sensor, driver seat (M27/2b1)
Inclination adjustment Hall sensor, driver seat (M27/3b1)
Head restraint adjustment Hall sensor, driver seat (M27/4b1)
Backrest inclination Hall sensor, driver seat (M27/5b1)

Interior CAN

The driver seat control unit reads in the following signals via interior CAN, among other things:

Seat adjustment request
Steering column adjustment request
Request for storing/moving to memory position

The functions that use these signals are described in the individual function descriptions (see appropriate block diagram or function schematic).

Evaluation of input factors

The read in input factors are evaluated by the driver seat control unit. The motors for seat and steering column adjustment are actuated via integrated relays.

Actuation of components

The following components are actuated via direct lines:

Steering column in/out adjustment motor (M20/1)
Steering column up/down adjustment motor (M20/2)
Driver seat fore/aft adjustment motor (M27/1)
Driver seat height adjustment motor (M27/2)
Driver seat inclination adjustment motor (M27/3)
Driver seat head restraint adjustment motor (M27/4)
Driver seat backrest inclination adjustment motor (M27/5)

With CODE 401 (Front comfort seats, incl. seat heating and seat ventilation):

Left front seat cushion seat ventilation motors (M18/9)
Left front backrest seat ventilation motors (M18/10)

With CODE (873) (Seat heater for left and right front seat):

Left front seat cushion heater pad (R13/1)
Left front backrest heated cushion (R13/2)

With CODE 876 (Interior lights package):

Left rear footwell lamp (E17/17)

The driver seat control unit supplies power to the driver seat lumbar support adjustment control unit (N32/23) and the driver multicontour seat control unit (N32/29) (with code (399) Front multicontour seats with massage function).

Transmitting signals

The driver seat control unit sends the following signals via interior CAN, among other things:

Request for acknowledge tone after storage in memory
Request for storing/occupying memory position
Seat position status

The functions that use these signals are described in the individual function descriptions (see appropriate block diagram or function schematic).

Variants

There are no variants for the hardware of the driver seat control unit. The country or left-hand drive vehicle/right hand drive vehicle allocation is software coded.

Wiring diagram of driver-side seat control unit

PE91.29-P-2104-97NAA