SSP_379_d1.pdf

Service Training

Self-study Programme 379

The Eos 2006

Electrical system

Design and function

The Volkswagen Eos takes a pioneering approach to

convertible roof technology.

Besides the actual convertible roof control system, this

also affects some of the vehicle's other electronic

systems, such as e.g. the window convenience control

system, the interior monitoring system or the parking

aid function.

As a supplement to self-study programme 335

"The Eos 2006", we would like to focus on the

function of the convertible roof control system and the

electrical system in the Eos in this issue.

Please also note self-study programme SSP355 "The Eos 2006" under all circumstances.

Only by reading both programmes will you be able to obtain an overview of the complex roof structure

and its function.

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NEW

Important

Note

The self-study programme shows the design and

function of new developments.

The contents will not be updated.

For current testing, adjustment and repair

instructions, refer to the relevant service literature.

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

The vehicle electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

The structure of the vehicle electrical system . . . . . . . . . . . . . . . . . . . . . . . . . 6

Voltage supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Data bus networking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

The vehicle electrical system in the CAN data bus . . . . . . . . . . . . . . . . . . . 10

Convenience electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Electrohydraulic convertible roof actuation . . . . . . . . . . . . . . . . . . . . . . . . . 12

Electric easy entry seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Interior monitoring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Radio and navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

The aerial concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Emergency operation strategies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Test yourself . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Introduction

Modern motor vehicles are characterised by a

multitude of electrical and electronic systems, which

regulate the vehicle's operation, increase vehicle

safety and driving comfort and support the driver in

driving the vehicle.

In view of this, the Eos, the most recent development

in the convertible range, also reveals a multitude of

vehicle systems which exchange information,

as part of controlling the convertible roof, to ensure

safe and flawless convertible roof operation. In the

Eos, the new immobilizer IV is one of those systems

which requires an on-line workshop link to download

data to adapt the system.

Interaction between these systems can only function

if they respond to each other. For example, the ABS

and ESP control unit must be able to instruct the

engine control unit to reduce the engine's output if this

is made necessary by a corresponding driving

situation. Today, this information is extensively

exchanged in digital form via fast data bus systems.

As a result of this high technical standard, it is

becoming increasingly important to update the

vehicle systems' software via on-line workshop links

and to ensure that this is kept up-to-date.

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In terms of its electrical system, the Eos offers the following special features, some of which originate from the

vehicle's conception as a coupé convertible:

●

Convertible roof control system

This contains the hydraulic and electric drive, the

convertible roof sensor system and communication

with other vehicle systems via CAN data bus.

●

Climate control system

This gives consideration to the influence of ambient

conditions when the convertible roof is open.

●

The aerial concept

Thanks to a new installation concept in the

rear lid, exterior and window aerials are no longer

necessary.

●

Interior monitoring system

Modern microwave technology guarantees

protection against theft even when the convertible

roof is open.

●

Rear lid assist

An extended Park Distance Control function

ensures that the space required behind the vehicle

for the convertible roof's action is available.

●

Immobilizer

The Eos is equipped with the immobilizer IV with

download function. An on-line link is the

prerequisite for adapting this.

In contrast to the Passat 2006, in which the system

was fitted for the first time, the immobilizer IV is not

equipped with an electric steering column lock.

●

Electric easy entry function

Comfortable entry and exiting to and from the rear

seats thanks to an electric seat adjustment system.

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