Component description of driver-side front seat adjustment control unit with memory - GF91.29-P-5223GZ

MODEL 164.1 /8 with CODE (275) Memory package (driver seat, steering column, mirrors) 

Location 

The driver-side front seat adjustment control unit with memory is located under the seat frame of the driver seat; the front passenger front seat adjustment control unit with memory (N32/2) is located under the seat frame of the front passenger seat.

Purpose (described for driver seat) 

The driver front seat adjustment control unit with memory is responsible for:

• 5-seat adjustment functions.
• the 2-steering column adjustment functions;
• Driver entry/exit aid through automatic seat and steering column adjustment into a position specified by the driver
• Sensing and storing actual position (last mode); can be performed key-related (depending on memory block number).
• Actuation of positions stored for adjustment functions

Design (described on driver seat) 

Discrete inputs:

• Circuit 15R
• Terminal 30
• Terminal 31
• Hall sensors for seat adjustment motors on driver seat/steering column

Discrete outputs:

• Power supply 12 V (+ and -) for all seat adjustment motors
• Power supply 12 V (+ and -) for all steering column adjustment motors

Function (described for driver seat) 

The driver front seat adjustment control unit with memory has the following functions:

Reading in sensors 

• seat front raise/lower switch (S22s2)
• seat rear raise/lower switch (S22s4)
• backrest switch (S22s5)
• seat fore/aft switch (S22s3)
• Head restraint adjustment switch (by actuating the backrest switch in longitudinal direction)
• Memory switch (S91s9)
• memory button 1, 2, 3 switch (S91s14)
• Hall sensors for steering column forward/back as well as up/down
• Hall sensors for driver seat height at front or back
• Hall sensors for driver seat longitudinal adjustment or backrest adjustment
• Hall sensors for driver seat head restraint

Switching consumers using relays 

• Steering column in/out motor (M20/1)
• Steering column up/down motor (M20/2)
• Driver seat longitudinal adjustment motor (M27/1)
• Driver rear seat height adjustment motor (M27/2)
• Driver front seat height adjustment motor (M27/3)
• Driver head restraint motor (M27/4)
• Driver backrest angle adjustment motor (M27/5)

CAN signals 

The driver front seat adjustment control unit with memory is a subscriber on the passenger compartment CAN bus.