Rear seats control unit, component description - GF91.29-P-5250SXA

MODEL 221.0 /1 with CODE (223) Rear bench seat with electrically adjustable outer seats with PRE-SAFE positioning function for outer seats and outer head restraints with CODE (276) Memory in rear with CODE (872) Electrically heated left and right rear seats with CODE (402) Rear deluxe seats, incl. seat heating and seat ventilation up to Model Year 8

Shown on model 221.0

Fig 1: Locating Rear Seats Control Unit

Courtesy of MERCEDES-BENZ USA

Location

The rear seats control unit is located behind the paneling in the luggage compartment on the right.

Tasks

The rear seats control unit has the following tasks:

Actuation of seat adjustment in the rear
Actuation of seat belt comfort fit feature
Actuation of seat adjustment with PRE-SAFE

With code (276) Memory in rear:

Actuation of seat adjustment memory

With code (872) Electrically heated left and right rear seats or code (402) Rear deluxe seats, incl. seat heating and seat ventilation:

Actuation of the heated seats HS [SIH]

With code (402) Rear deluxe seats, incl. seat heating and seat ventilation:

Actuation of the seat ventilation

Voltage supply

The rear seats control unit provides voltage to the following components:

Left rear head restraint inclination adjustment motor (M18/15)
Right rear head restraint inclination adjustment motor (M18/16)
Left rear seat fore/aft adjustment motor (M18/17)
Right rear seat fore/aft adjustment motor (M18/18)
Left rear seat cushion inclination adjustment motor (M18/19)
Right rear seat cushion inclination adjustment motor (M18/20)
Left rear backrest angle adjustment motor (M27/11)
Right rear backrest angle adjustment motor (M28/11)

With code (872) Electrically heated left and right rear seats or code (402) Rear deluxe seats, incl. seat heating and seat ventilation:

Left rear seat heated cushion (R13/5)
Left rear backrest heated cushion (R13/6)
Right rear seat heated cushion (R13/7)
Right rear backrest heated cushion (R13/8)

With code (402) Rear deluxe seats, incl. seat heating and seat ventilation:

Right rear seat backrest ventilation motor group (M18/5)
Right rear seat cushion ventilation motor group (M18/6)
Left rear seat backrest ventilation motor group (M18/7)
Left rear seat cushion ventilation motor group (M18/8)

Discrete inputs

Tml. 30
(Term. 31)
Hall sensors of the motors (M18/15, M18/16, M18/17, M18/18, M18/19, M18/20, M27/11 and M28/11)

CAN signals

The rear seats control unit is a participant on the interior CAN.