Volkswagen Golf Variant / Jetta. Manual - part 750

– Release and disconnect connector -1-.
– Press control unit guides apart slightly on either side and pull

data bus diagnostic interface -J533- upwards out of bracket.

Installing
Installation is carried out in reverse order of removal.

5.2.4

Coding data bus diagnostic interface -

J533-

Special tools and workshop equipment required
♦ Vehicle diagnosis, testing and information system -VAS

5051B-

Procedure
– Connect vehicle diagnosis, testing and information system -

VAS 5051B- .

– In vehicle diagnosis, testing and information system -VAS

5051B- , select „Guided fault finding“.

– Using 

GoTo

 button, select „Functions/component“ and the fol‐

lowing menu options in succession:

♦ Body
♦ Electrical system
♦ 01 - On Board Diagnosis capable systems
♦ Data bus diagnostic interface
♦ Data bus diagnostic interface functions

470

5.2.5

Checking bus activity

Special tools and workshop equipment required
♦ Vehicle diagnosis, testing and information system -VAS

5051B-

Using this test it is possible to check to see if the individual drive

busses (powertrain, convenience and infotainment) have

changed to the sleep mode.
Procedure
– Connect vehicle diagnosis, testing and information system -

VAS 5051B- .

– In vehicle diagnosis, testing and information system -VAS

5051B- , select „Guided fault finding“.

– Using 

GoTo

 button, select „Functions/component“ and the fol‐

lowing menu options in succession:

♦ Body
♦ Electrical system
♦ 01 - On Board Diagnosis capable systems
♦ Data bus diagnostic interface
♦ Data bus diagnostic interface functions
♦ Check bus activity

5.2.6

Checking bus participants

Special tools and workshop equipment required
♦ Vehicle diagnosis, testing and information system -VAS

5051B-

Using this test it is possible to check the status of the connection

from the data bus diagnostic interface -J533- to another bus node.

5. Control units    

471

VAS 5051B- .

– In vehicle diagnosis, testing and information system -VAS

5051B- , select „Guided fault finding“.

– Using 

GoTo

 button, select „Functions/component“ and the fol‐

lowing menu options in succession:

♦ Body
♦ Electrical system
♦ 01 - On Board Diagnosis capable systems
♦ Data bus diagnostic interface
♦ Data bus diagnostic interface functions
♦ Check bus participants

5.3

Convenience system central control unit

-J393-

General description
The convenience system control unit -J393- is responsible for the

following in the vehicle:
♦ Sliding/tilting sunroof control (release instruction)
♦ Power window control (release instruction)
♦ Central locking control
♦ Anti-theft alarm system control
♦ Radio-wave receiver
♦ Rear lid lock
♦ Convenience operation
Some of the above mentioned functions can be adapted

⇒ page 474

 .

Fault detection and fault display
The convenience system central control unit -J393- is equipped

with self-diagnosis.
For fault finding, use vehicle diagnosis, testing and information

system -VAS 5051B- in „Guided fault finding“ mode.
Additional information:
♦ ⇒  Operating manual
♦ ⇒ Current flow diagrams, Electrical fault finding and Fitting lo‐

cations

5.3.1

Removing and installing convenience

system central control unit -J393-

Caution

♦ Switch off ignition and all electrical consumers.
♦ Remove the ignition key.

472

Rep. gr.  68 .

– Pull locking lug -1- of retainer for convenience system central

control unit -J393- in -direction of arrow- and push conven‐

ience system central control unit -J393- until recesses -2- are

positioned over recesses -3-.

Note

The connectors can only be released and detached once the re‐

cesses -arrows- of the connector and bracket are aligned with

each other precisely.

– Detach connectors from central control unit of convenience

system -J393- .

Note

The number of connectors depends on the vehicle equipment

level.

– Remove securing nuts -arrows-.
– Remove bracket with central convenience system control unit

-J393- .

– Pull retaining lug -1- in -direction of arrow B- and push central

convenience system control unit -J393- -2- in

-direction of arrow A- out of bracket.

Installing
Carry out installation in the reverse sequence, noting the follow‐

ing:

5. Control units    

473