Volkswagen Jetta / Bora: Electrical System Manual - part 69

stallation frame.

Installing:
Install in reverse order of removal.

Jetta 2005 ➤ , Bora 2006 ➤

7. Lights and switches in centre console    

273

Horn

8.1

Removing and installing treble tone horn

-H2- and bass tone horn -H7-

Note

♦

The treble tone horn -H2- and the bass tone horn -H7- are

controlled in parallel from the onboard supply control unit -

J519- .

♦

The procedure for removal and installation of treble tone horn

-H2- and bass tone horn -H7- is the same and is therefore

described for just one horn.

♦

The horns are installed to the left and the right of the longitu‐

dinal members.

Front bumper

– Disconnect connector -arrow-.

– Unscrew securing bolt -arrow- and remove horn.
Installing:
Install in reverse order of removal.

8.2

Checking treble tone horn -H2- and bass

tone horn -H7-

The horns ( treble tone horn -H2- and bass tone horn -H7- ) can

be checked using final control diagnosis from the onboard supply

control unit -J519- .

Jetta 2005 ➤ , Bora 2006 ➤

274

Immobilizer

General description:
The vehicle is equipped with an immobilizer of the 4th generation.
Modifications by comparison with the immobilizer of the 3rd gen‐

eration:
♦ An adaptation of components of other group marks to Volks‐

wagen vehicles is no longer possible.

♦ Vehicle keys are preprogrammed with a base code by the

manufacturer. This base code includes a specific manufactur‐

ers code. It is only possible to learn a key of a vehicle if they

are programmed with the right manufacturers code.

Fault detection and fault display:
The immobilizer is equipped with self-diagnosis which makes fault

finding easier.
For fault finding, use the vehicle diagnosis, testing and informa‐

tion system -VAS 5051A- in “guided fault finding” mode.

9.1

Immobilizer control unit -J362-

The immobilizer control unit -J362- is integrated in the dash panel

insert. If the control unit is defective the complete dash panel in‐

sert must be renewed.
– Renewing dash panel insert 

⇒ page 150

 .

9.2

Immobilizer reader coil -D2-

The immobilizer reader coil -D2- is joined to the ignition switch

and cannot be renewed individually.
– Removing and installing ignition switch 

⇒ page 231

 .

9.3

Ignition key

– Removing and installing the ignition key battery with radio re‐

Central locking; Removing and installing battery for the (fold‐

ing) main key with radio remote control .

– Removing and installing the radio container (transmission unit

for radio-controlled central locking) for the ignition key ⇒  Gen‐

eral Body Repairs, Exterior; Rep. Gr.  57 ; Central locking;

Removing and installing battery for the (folding) main key with

radio remote control .

9.3.1

Ignition key - change code transponder

It is not possible to replace the change code transponder in the

ignition key.
The entire key must always be replaced if the change code trans‐

ponder is found to be defective.

Note

♦

If an ignition key is replaced or an additional ignition key is

required, the new ignition key must always be adapted to the

immobilzer 

⇒ page 276

 .

♦

If the radio container (transmission unit for radio-controlled

central locking) of the ignition key is also replaced, it must be

adapted to the comfort system 

⇒ page 276

 .

Jetta 2005 ➤ , Bora 2006 ➤

9. Immobilizer    

275

Adapting ignition keys to the immobilizer

– Connect Vehicle Diagnosis, Testing and Information System

-VAS 5051A- 

⇒ page 281

 .

– Select “guided fault finding” in Vehicle Diagnosis, Testing and

Information System -VAS 5051A- .

– Using the “Go to” key, select “Function/component selection”

and the following menu items one after the other:

♦ Body
♦ Electrical System
♦ 01 - On Board Diagnostic capable systems
♦ Immobilizer
♦ Immobilizer functions
♦ Adapting ignition keys

9.3.3

Adapting ignition keys to the comfort

system

– Connect Vehicle Diagnosis, Testing and Information System

-VAS 5051A- 

⇒ page 281

 .

– Select “guided fault finding” in Vehicle Diagnosis, Testing and

Information System -VAS 5051A- .

– Using the “Go to” key, select “Function/component selection”

and the following menu items one after the other:

♦ Body
♦ General Body Repairs
♦ 01 - On Board Diagnostic capable systems
♦ Comfort system
♦ Comfort system central control unit functions
♦ J393 - Adapting / testing keys with radio remote control

Jetta 2005 ➤ , Bora 2006 ➤

276