SSP 235 Multi-function steering wheel [20s].pdf

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Service.
Self-Study Programme 235
The Multi-Function Steering Wheel
Design and Function
MULTI-FUNCTIONS
MULTIFUNKTION
STEERING
CRUISE CONTROL SYSTEM
AIRBAG
RADIO
CASSETTE
CD PLAYER
…
…
TELEPHONE
HORN
HEIGHT ADJUSTMENT
REACH ADJUSTMENT
MULTI-TALENT
Raising the comfort for the driver of a vehicle has always been a high priority for the vehicle
constructor.
The concept of positioning regularly used switches and safety elements on the steering wheel is
the aim of this endeavour.
Originally the regulators for the accelerator and the ignition timing were positioned next to the
horn contact, today in addition to the horn we find levers and buttons for the headlights, turn
signals, cruise control system, radio, telephone, CD player etc.
Apart from this, the steering wheel contains functional elements such as the airbag and, under
certain conditions, a vibration damper.
Such a versatile steering wheel is known as a multi-function steering wheel (MFW).
235_022
NEW
Important
Note
The Self-Study Programme presents the design
and function of new developments!
The contents are not updated.
Please always refer to the relevant Service literature for current test,
adjustment and repair instructions.
2
At a glance
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Design of MFW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Description
Variants
Button assignment
Display
Operation
Electrical circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Coil connector
Data transfer
Control unit contact assignment
Self-diagnosis
Function diagram
3
Introduction
At the moment the driver must remove his hand
from the steering wheel, or even take their eye
off the road ahead, to adjust the volume of a
radio, select another radio station or to operate
the cassette/CD player.
The driver’s attention is distracted from the road
ahead and therefore dangerous situations may
be recognised too late, or even provoked.
235_009
Telephoning in the vehicle, whilst driving, creates
an even more critical situation.
With some hands-free systems the handset must
be held in the hand to dial or send a telephone
number.
Even the use of speed-dial functions may
severely distract a driver.
To reduce these moments of danger and to
increase the convenience factor still further, some
of the regularly used functions for
– the radio,
– the cruise control system (CCS)
– and the operation of the telephone
have been integrated into the rocker switches in
the steering wheel.
Such an equipped steering wheel is known as a
Multi-function steering wheel (MFW).
235_010
4
MFW design
Description
Two switch modules are integrated into the left
and right-hand sides of the airbag unit in the
multi-function steering wheel next, to the horn
controls.
These modules are rocker switches each with two
functions.
These buttons can remotely control
– the radio,
– the cruise control system (CCS)
– and the telephone.
RES
+
235_020
An additional button in integrated into the back
of the left-hand button module to switch-off the
illumination of the buttons.
There is a short delay when switching the
illumination ON/OFF.
The electrical connections between the steering
wheel electronics and the onboard supply is
established via a coil connector in the steering
wheel.
The transfer of data between individual
components is via a single wire data bus.
RES
ON OFF
SET -
CANCEL
235_026
The central display of the combi-instrument in the
dash panel insert (Highline display), displays the
radio station, the CD title/number or the name
and telephone number stored on the telephone
SIM card when audio/telephone system is in
operation.
CAN
CAN-H
CAN-L
Some models have a vibration
damper in the multi-function
steering wheel (MFW) to reduce
vibrations.
235_018
5

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