Volkswagen Jetta / Bora: Electrical System Manual - part 51

Note

If the control unit for headlight range control -J431- has been co‐

ded, the basic setting of the headlights must be performed after

having coded the control unit ⇒ Maintenance ; Booklet  20.1 .

2.8

Vehicle level sender

There is a vehicle level sender located on the front axle ( front left

vehicle level sender -G78- ) and on the rear axle ( rear left vehicle

level sender -G76- ).

Note

♦

If the vehicle level senders are replaced, check the values from

the sensors 

⇒ page 203

 and carry out basic setting on head‐

lights ⇒ Maintenance ; Booklet  20.1 .

♦

If the values from the vehicle level sensors are outside the

specified tolerance, basic headlight setting cannot be carried

out.

2.8.1

Removing and installing front left vehicle

level sender -G78-

Removing:
– Switch off ignition and all electrical consumers and pull out

ignition key.

– Pull off connector -arrow-.

Jetta 2005 ➤ , Bora 2006 ➤

2. Main headlights with gas discharge bulbs    

201

sender -G78- -3-.

Installing:
Installation is carried out in the reverse order. When installing,

note the following:
– Tighten threaded connections to specified torque settings

⇒ page 238

 .

– Check front left vehicle level sender -G78- 

⇒ page 203

 .

– Perform basic setting of headlights ⇒ Maintenance ; Booklet 

20.1 .

Note

♦

If the vehicle level sensors are replaced, check the sensor

values 

⇒ page 203

 and carry out basic setting on headlights

⇒ Maintenance ; Booklet  20.1 .

♦

If the values from the vehicle level sensors are outside the

specified tolerance, basic headlight setting cannot be carried

out.

2.8.2

Removing and installing rear left vehicle

level sender -G76-

Removing:
– Switch off ignition and all electrical consumers and pull out

ignition key.

– Pull off connector -arrow-.

Jetta 2005 ➤ , Bora 2006 ➤

202

cle sender -G76- -2-.

Installing:
Installation is carried out in the reverse order. When installing,

note the following:
– Tighten threaded connections to specified torque settings

⇒ page 238

 .

– Check front left vehicle level sender -G76- 

⇒ page 203

 .

– Perform basic setting of headlights ⇒ Maintenance ; Booklet 

20.1 .

Note

♦

If the vehicle level sensors are replaced, check the sensor

values 

⇒ page 203

 and carry out basic setting on headlights

⇒ Maintenance ; Booklet  20.1 .

♦

If the values from the vehicle level sensors are outside the

specified tolerance, basic headlight setting cannot be carried

out.

2.8.3

Checking vehicle level sender

The vehicle level senders transmit the longitudinal inclination an‐

gle of the vehicle by way of signals to the headlight range control

unit -J431- .
It must then be confirmed whether the rear left vehicle level sen‐

sor -G76- and front left vehicle level sensor -G78- are supplying

the headlight range adjustment unit -J431- with plausible signals.
No fault entry is stored in the headlight range control unit -J431-

in the following instances:
♦ Vehicle level senders installed are not of type specified in this

workshop manual

♦ Vehicle level senders have mechanical fault
♦ Vehicle suspension has been modified (e.g. lowered)

Note

If the values of the vehicle level senders are outside the specified

tolerance, basic headlight setting cannot be carried out.

– Connect the vehicle diagnosis, testing and information system

-VAS 5051A- to 

⇒ 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
♦ Automatic headlight range control
♦ Automatic headlight range control functions
♦ Checking vehicle level sender

Jetta 2005 ➤ , Bora 2006 ➤

2. Main headlights with gas discharge bulbs    

203

Servicing headlight securing lugs

Information on servicing headlight securing lugs was not available

when it was time of going to press.

2.10

Adjusting headlights

Adjusting headlights with gas discharge lamp ⇒ Maintenance ;

Booklet  20.1 .

Jetta 2005 ➤ , Bora 2006 ➤

204