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

MODEL 172.4 

with CODE (275) Memory package for electrically adjustable front seats 

Location 

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

Courtesy of MERCEDES-BENZ USA

Tasks 

• Control of the seat and steering column adjustment as per the requests via the interior CAN (CAN B)
• Storing the memory settings for seat, steering column, and outside mirror
• Control of the easy entry/exit feature
• Actuation of the crash-active easy exit function
• Control of the collision avoidance with the bulkhead

The tasks are subdivided as follows:

• Reading in of sensors and signals 
• Evaluating input factors 
• Actuating components 

Reading in of sensors and signals 

These input factors are read in via the following connections:

• Direct line 
• Interior CAN 

Direct line 

The following sensors are read in via direct lines:

• Hall sensor for steering column forward and back (M20/1b1)
• Hall sensor for steering column up and down (M20/2b1)
• Hall sensor for seat fore/aft adjustment, driver seat (M27/1 b1)
• Hall sensor for height adjustment, driver seat (M27/2b1)
• Hall sensor for inclination adjustment, driver seat (M27/3b1)
• Hall sensor for backrest inclination, driver seat (M27/5b1)

Interior CAN 

The signals are read in by the driver seat control unit via the interior CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see 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.

Component actuation 

The actuation of the components takes place via the following connections:

• Direct line 
• Interior CAN 

Direct line 

The following motors 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 backrest inclination adjustment motor (M27/5)

Interior CAN 

The signals are transmitted by the driver seat control unit via the interior CAN.

The functions resulting therefrom are described in the corresponding function descriptions (see 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-2104-97TAA