Seat adjustment, function

P91.29-2346-09

Shown on vehicles as from 1.7.02

1 Circuit status

2 Door contact status

3 Adjust request

4 Motor actuation

5 Position measurement

M27m1 Fore/aft motor

M27m2 Rear up/down motor

M27m3 Front up/down motor

M27m4 Head restraint up/down motor

M27m5 Backrest motor

M28m1 Fore/aft motor (for code (242b) front passenger seat electrically adjustable with memory)

M28m2 Motor backward, raise and lower (for code (242b) front passenger seat electrically adjustable with memory)

M28m3 Motor forward, raise and lower (for code (242b) front passenger seat electrically adjustable with memory)

S17/4 Right front door contact switch

S91/2 Left front door ESA switch group (with memory)

S91/2s1 Seat fore/aft switch

S91/2s2 Rear raise/lower switch

S91/2s3 Seat front raise/lower switch

S91/2s4 Head restraint raise/lower switch

S91/2s5 Backrest switch

S92/2 Seat adjustment switch group for right front door (memory) (for code (242b) front passenger seat electrically adjustable with memory)

S92/2s1 Seat fore/aft switch (for code (242b) front passenger seat electrically adjustable with memory)

S92/2s2 Rear seat raise/lower switch (for code (242b) front passenger seat electrically adjustable with memory)

M28M4 Motor for head restraint, raise and lower (for code (242b) front passenger seat electrically adjustable with memory)

M28m5 Backrest motor (for code (242b) front passenger seat electrically adjustable with memory)

N10/2 Rear SAM control unit with fuse and relay module

N32/1 Driver front seat adjustment control unit with memory

N32/2 Passenger-side front seat adjustment control unit with memory (for code (242b) front passenger seat electrically adjustable with memory)

N69/1 Left front door control unit

N69/2 Right front door control unit

N73 DI control unit

S17/3 Left front door contact switch

S92/2s3 Seat front raise/lower switch (for code (242b) front passenger seat electrically adjustable with memory)

S92/2s5 Backrest switch (for code (242b) front passenger seat electrically adjustable with memory)

CAN-B Controller area network bus class B (interior compartment) (CAN B)

S92/2s4 Head restraint raise/lower switch (for code (242b) front passenger seat electrically adjustable with memory)

Function requirements

 Circuit 15R ON or

 Circuit 15 ON or

 Door open

 No undervoltage or overvoltage

Function illustrated on driver seat

Through actuation of the

 seat fore/aft switch (S91/2s1),

 rear seat raise/lower switch (S91/2s2),

 seat front raise/lower switch (S91/2s3),

 head restraint raise/lower switch (S91/2s4) or the

 backrest switch (S91/2s5)

on the left front door seat adjustment switch group (memory) (S91/2) the driver seat can be accordingly adjusted.

The adjust request is read in by the left front door control unit (N69/1) and forwarded via the CAN-B (CAN-B) to the driver-side front seat adjustment control unit with memory (N32/1).

The driver-side front seat adjustment control unit with memory (N32/1) then actuates the motors (M27m1, M27m2, M27m3, M27m4 or. M27m5) accordingly.

 The front passenger seat is adjusted in accordance with the same scheme as the driver seat.

Head restraint presetting (only  and )

The position of the head restraints is preset automatically depending on the seat's longitudinal adjust position by the driver-side front seat adjustment control unit with memory (N32/1) or the passenger-side front seat adjustment control unit with memory (N32/2). The head restraint presetting function can be switched on or off using STAR DIAGNOSIS and is only performed for normalized driver or front passenger seats.