Power Seat Control Module: Description and Operation

GF91.29-P-5223GZ Component Description Of Driver-side Front Seat Adjustment Control Unit With Memory
- 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.