Driver Seat Control Unit, Component Description - GF91.29-P-5231RR

Model 190 

With Code P64 (Memory package) 

Location 

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

Task 

The driver seat control unit is responsible for the following tasks:

• Control of the seat and steering column adjustment
• Control of the memory function for seat steering column and outside mirror
• Control of easy entry/exit
• Control of crash-active easy exit
• Control of collision avoidance with the bulkhead

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 Hall sensors are read in 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 (M27/1 b1)
• Height adjustment Hall sensor, driver seat (M27/2b1)
• Inclination adjustment Hall sensor, driver seat (M27/3b1)
• 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
• Save/adopt memory position request
• Terminal status of terminal 15
• Steering column adjustment request
• Door status (open/closed)
• Crash signal

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

Evaluation of input factors 

The input factors that have been read in are evaluated by the driver seat control unit and the relevant components are then actuated.

Actuation of components 

The following motors are actuated via integrated relays and subsequently 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)

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 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 seat control unit		PE91.29-P-2104-97HBA
	Overview of system components, electric seats		GF91.29-P-9992RR