Volkswagen Self Study Program 235 – The Multi-Function Steering Wheel SSP-235-Multi-function-steering-wheel

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Page 1

Service.

Self-Study Programme 235

The Multi-Function Steering Wheel

Design and Function

Page 2

MULTIFUNKTION

MULTI-FUNCTIONS

STEERING

CRUISE CONTROL SYSTEM

AIRBAG

RADIO

CASSETTE

CD PLAYER

TELEPHONE

HEIGHT ADJUSTMENT

REACH ADJUSTMENT

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.

MULTI-TALENT

…

HORN

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Such a versatile steering wheel is known as a multi-function steering wheel (MFW).

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.

NEW Important

Note

Page 3

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

Page 4

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.

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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.

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Such an equipped steering wheel is known as a Multi-function steering wheel (MFW).

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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.

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.

MFW design

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CANCEL

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.

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.

Some models have a vibration damper in the multi-function steering wheel (MFW) to reduce vibrations.

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CAN

CAN-H

CAN-L

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MFW design

Variants

The multi-function steering wheel is available in two different versions:

Audio/CCS variant

MFW can remotely control functions of the radio and CCS.

A button to control the illumination of the buttons on the steering wheel is also integrated.

Audio/CCS/telephone variant

In addition to the above mentioned functions, the fitted telephone can also be controlled from the steering wheel.

A button to control the illumination of the buttons on the steering wheel is also integrated.

With both variants of MFW, the selection of radio, cassette or CD changer operation is made directly on the radio unit as before.

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Button assignment

Audio/CCS variant

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Button

module

Right VOL + Volume “up“

Left RES + Resume

Button

symbol

Louder

VOL – Volume “down“

Quieter

Scroll “up“ Station search up

Scroll “down“ Station search down

Resume stored speed

SET – Set

Store or reduced speed

Function Significance

Increases volume

Decreases volume

Radio: Station search, up Cassette: Fast forward CD: Title search forwards Telephone: Scroll up

Radio: Station search, down Cassette: Fast rewind CD: Title search backwards Telephone: Scroll down

Speed of vehicle will increase or will be resumed

Current speed will be stored or reduced

Vacant Vacant Blocked mechanically

CANCEL CCS off; Switches CCS off

Rear Button illumination Button illumination ON/OFF

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MFW Design

Button assignment

Audio/CCS/telephone variant

The lower rocker of the left-hand button module is assigned differently to the Audio/CCS variant.

Button

module

Lower left

Lower right Search telephone

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Button

symbol

TEL Telephone Initiate call

MODE Change-over For radio/CC/CD: switch to telephone mode

book

Function Significance

Accept call End call

For telephone: switch to radio mode

Search telephone book upwards

Search telephone book downwards

The CCS function “CANCEL“ is controlled from the CCS switch.

The functions for the horn and airbag remain unchanged.

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Display

Highline display

Example: Radio mode

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MODE Radio Compact cassette

Display

Pop-Radio

FM 1.2 TP

Significance Station

name

Cassette

forwards or rewind

Station

frequency

* The name of the subscriber is displayed when the

name is stored. Otherwise the number transmitted

will be displayed or “Call“, will be displayed when

no number is transmitted.

CD player Telephone

(CC)

TAPE CD 02

TR 09

CD number

Title number

MEIER

0234567

Name or telephone number of subscriber *

Page 10

MFW design

When in telephone mode additional display texts are activated. They equate to the standard operating texts displayed by a mobile telephone etc.

Following texts can, for example, appear on the display:

Connection to transmitter is not possible; connection will be disconnected

No telephone (SIM) card in telephone unit

Enter PIN code

NO SERVICE

CARD PLEASE

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PIN PLEASE

PLEASE WAIT …

Telephone (SIM) card being read

Incoming call

Line engaged

CALL

DIAL

ENGAGED

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Page 11

Operation

Example: telephone

Incoming call

– Telephone rings,

in central display; press hand button module

– The hands-free system switches to

“ON“

automatically

– When the telephone number of the

caller is stored on the telephone SIM card, the callers name appears on the central display of the combi-instrument

–

Telephone

– Once call has ended press

– The hands-free system switches to

“OFF“

– Call ended

–

With radio mode

if the function “Accept calls automatically“ is activated:

– The hands-free system switches

automatically to

–

Telephone

– The subscriber ends call and the hands-

free system automatically switches to

“OFF“

automatically

“MODE“

“CALL“

as normal

“END CALL“

button you can return to

“ON“

as normal

e.g. appears

“TEL“

after 3 rings

on left-

“TEL“

button

Outgoing call

Depress

–

function “ “ (lower right-hand button module), to scroll through the telephone book until the required name or telephone number appears on the central display of the combi-instrument; Once the item desired appears press

“TEL“

number displayed;

“DIAL“

Once the subscriber has accepted the

–

call the hands-free system switches to

“ON“

If the number dialled is engaged then

–

“ENGAGED“

display

Calls are ended by pressing the

–

button; the hands-free system switches to

“OFF“

– Call ended

–

With radio mode

Note:

Pressing once: jumps to next entry; Pressing longer (approx. 2 seconds); scrolls through alphabetically;

“MODE“ “TEL“

button and telephone dials the

appears in the central display

“MODE“

button to change to

; use button “ “ and

appears on the central

“END CALL“

button you can return to

“TEL“

Page 12

Electrical circuits

Block circuit diagram

E221

Airbag

123

N95

E45

ON OFF

J...

EW-

12 345

J234

12 345

54 321

J453

F138

CAN

3115

31 15 30

58d

CAN-H CAN-L

E 45 CCS switch E221 Multi-function steering wheel

(steering wheel operating unit) F138 Coil connector H Horn plate H1 Horn J… Engine control unit J4 Dual tone horn relay

* when CAN, then R and 58d are omitted

(optional)

J234 Airbag control unit J453 Multi-function steering wheel control

K Diagnostic connection N95 Airbag igniter, driver’s side R Radio T Button for illumination of button

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unit

module

Page 13

Coil connector

Design and function

The electrical connection between the rotating steering wheel, with its steering wheel electronics, and the onboard electrics is provided by a highly flexible coil connector.

With increased desires for more comfort and safety, ever more functions are being controlled from the steering wheel. The number of available conductors is limited.

The multi-function steering wheel uses a coil connector with five conductors. These circuits are printed on a highly flexible strip.

The five conductors are used for:

– the triggering of the driver’s airbag (2 con-

ductors),

– the current supply for the operating units in

the steering wheel (2 conductors) and

– the CAN wiring (1 conductor)

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The coil connecter fitted into the steering angle sender G85 functions analogously.

F138 Airbag coil connector

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Electrical circuits

Data transfer

… between multi-function steering wheel control unit and radio is via the remote control interface for the radio/RNS (radio connector C 2, pin 11).

PIN6

PIN11

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… from multi-function steering wheel control unit to engine control unit to remotely control the cruise control system (CCS) direct via the wiring (pin 16 and 8) and CANCEL CCS.

… from multi-function steering wheel control unit to dash panel insert for the displays and telephone interface via the convenience data bus (Infotainment CAN).

The function of the telephone is not implemented into the hardware or the software of the multifunction steering wheel, but is a component part of the telephone system.

RES+ PIN16

PIN8 SET-

PIN3

PIN1

GRA

CAN high

CAN low

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… from multi-function steering wheel control unit to steering wheel electronics via the coil connector.

PIN18

PIN5

CAN

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Contact assignment of multi-function steering wheel

The multi-function steering wheel (MFW) control unit is located in a double relay housing on the central electrics relay carrier as relay No. 450.

The pin assignment is shown in the following table.

Contact Function

1 Convenience data bus, low (CAN-L)

2 Reserved

3 Convenience data bus, high (CAN-H)

4 CCS OFF

5 Remote control of radio

6 Diagnostic cable K

7 Reserved

8 CCS SET

9 Dual tone horn relay

10 Terminal 31

11 Reserved

12 Terminal 15

13 Terminal 30

14 CANCEL CCS

15 Terminal 58d

16 CCS RES

17 Reserved

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18 Data bus for steering wheel electronics

Technical status October 2000

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Electrical circuits

Self-diagnosis

Vehicle Diagnosis, Testing and Information System can be used for the following diagnosis functions:

01 - Interrogate control unit version 02 - Interrogate fault memory 03 - Final control diagnosis 04 - Not used 05 - Erase fault memory 06 - End output 07 - Code control unit 08 - Read measured value (data) block

Address word for self-diagnosis

16 - Steering wheel electronics

01 - Interrogate control unit version

02 - Interrogate fault memory 01426 Operating unit in steering wheel E221

03 - Final control diagnosis

Following functions are activated one after the other: Radio louder

Radio quieter Radio station search upwards Radio station search downwards MODE Telephone memory Next item in telephone memory END

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1J0907487 Steering wheel electronics xx.xx—>

Coding: 00008 WSC

No communication, Implausible signal; 65535 Control unit defective

Radio volume increases audibly Radio volume decreases audibly Seeks next radio station, display Seeks previous radio station, display Changes between audio and telephone modes Seeks first name in telephone memory, display Seeks next name in telephone memory, display End of final control diagnosis

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07 - Code control unit

e.g. 00008 Audio/CCS

08 - Read measured value block (data block)

001 – Quieter button – Louder button – Search down button – Search up button

002 – CCS RES button – CCS SET button

003 – Telephone button – MODE/CCS OFF button

Quieter (button not operated) Louder (button not operated) Down (button not operated) UP (button not operated)

RES/+ (button not operated) SET/– (button not operated)

not operated/operated not operated/operated

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Electrical circuits

Function diagram, example: version Audio/CCS

30 15

E221

SSS

Airbag

123

N95

J234 J220 J453

E45

ON OFF

1234

5432

58d

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F138

CAN

75 30

CAN-BUS H

30 15

Version with Audio/CCS

Legend

D Ignition/starter switch E45 CCS switch E221 Operating unit in steering wheel F138 Coil connector for airbag/return spring

with sip ring H Horn plate H1 Horn/dual tone horn J4 Dual tone horn relay J220 Motronic control unit J234 Airbag control unit J453 MFW control unit

N95 Airbag igniter, driver’s side R Radio S Fuse T Button for illumination of button module

CAN-BUS L

in out

* when CAN, then R and 58d are omitted

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Service.

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040.2810.54.20 Technical status 07/01

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