Seats - SMART Series 451 Service Manual

SN_Typ 451_us.book Seite 108 Freitag, 30. November 2007 1:56 13

Seats

Seats, general
The safety integral seats on both sides of model
series 451 can be adjusted in terms of seat length and
backrest angle.
The backrest of the passenger seat can be folded
forwards to allow through-loading of long loads.
A TopTether anchor is bolted to the load compartment
floor behind the passenger seat as standard. The
guide for the TopTether belt is located on the back-
rest cover of the passenger seat level with the head
restraint.
Seat heaters in the seat bolster and backrest cushion
are available as special equipment.
Integral seats
108 Introduction of the smart fortwo, Model Series 451
Seat heaters
The seat heater special equipment in model 451
consists of two heating elements which are installed in
the seat bolster and backrest cushion of each seat.
The seat heaters are activated separately for each
side via the switch panel in the center console.
Pressing the seat heater switch for the driver or
passenger side switches on the seat heater at stage 2.
Another press of the switch switches the seat heater
to stage 1. If the switch is pressed a third time, the
seat heater is switched off. The different stages are
indicated in the relevant switch by the lighting of one
LED for stage 1 and two LEDs for stage 2.
The heated seats control unit incorporates a temper-
ature sensor that measures the ambient temperature.
The heating elements in the driver and passenger
seats follow a temperature profile based on this
temperature. The heater output is constantly moni-
tored to check the seat temperature.
Function
Function requirements:
• Switch circuit 15 ON
When the seat heater switch for the driver or
passenger seat is pressed, a request signal is sent
directly to the heated seats control unit. In the heated
seats control unit the request for activation of the
seat heater is processed with the function require-
ment.
The function requirement is transmitted by the igni-
tion/starter switch straight to the SAM control unit,
from where it is forwarded to the heated seats control
unit.
If all the criteria for activation are satisfied, the
appropriate seat heater is switched on by the heated
seats control unit over a direct line.
P91.10-3254-00-