Vehicle level senders at front axle — AUDI

Vehicles with gas-discharge lamps feature automatic headlight range control as standard.

=> Electrical System; Repair Group 94
Electrical System

The automatic headlight range control function requires information on bump or rebound travel at front and rear axle.

For this purpose, position of lower left link with respect to body is transmitted via a connecting link to front left vehicle level sender -G78-. Sender then transmits electrical signals to headlight range control unit -J431.

Headlight range control unit -J431

=> Electrical System; Repair Group 94; Exploded View of Automatic Headlight Range Control; Removing and installing headlight range control unit -J431
Electrical System
Exploded View of Automatic Headlight Range Control
Removing and installing headlight range control unit -J431

The automatic headlight range control reacts to changes in vehicle level. Further details on operation can be found in Self Study Programme No. 192.

The following situations may produce a change in vehicle level:

Use of trailer
Different loads (vehicle unladen, partly laden or fully laden)
Driving style (fast/slow)

Attention:
Headlight setting
Headlight basic setting is always to be checked:

Following removal/installation or replacement of track control link
Following vehicle level sender installation work
Following replacement of vehicle level sender
After unfastening clip for connecting link at track control link

Headlight basic setting

=> Electrical System; Repair Group 01; Self-diagnosis of automatic headlight range control; Basic setting
Electrical System
Self-diagnosis of automatic headlight range control
Basic setting

Arrow faces in direction of travel.

Bracket
Front left vehicle level sender -G78
Removing and installing=>Page
40-26
and

=> Electrical System; Repair Group 94; Exploded View of Automatic Headlight Range Control; Removing and installing front left vehicle level sender -G78
Electrical System
Exploded View of Automatic Headlight Range Control
Removing and installing front left vehicle level sender -G78

Checked by self-diagnosis

=> Electrical System; Repair Group 01; Self-diagnosis of automatic headlight range control
Electrical System
Self-diagnosis of automatic headlight range control

Perform headlight basic setting following replacement

=> Electrical System; Repair Group 01; Self-diagnosis of automatic headlight range control; Basic setting
Electrical System
Self-diagnosis of automatic headlight range control
Basic setting

Hexagon socket-head bolt, 5Nm
Pop rivet (2x steel)
ø 4.8 mm

Hexagon nut, 4 Nm
=> Page
40-26

Shock absorber
Connecting link
Connecting link of front left vehicle level sender -G78
Stop
Position clip between stops
Fastener of clip must face upwards at track control link and in direction of travel

Track control link

Removing and installing

Removal/installation of track control link involves unfastening clip for connecting link of front left vehicle level sender -G78.

Note:

When attaching connecting link to crank of front left vehicle level sender -G78, use 10 mm open-ended wrench with dimension -A- = 4 mm, so as not to damage seal.

Dimension - A - 4 mm

1 -
Tightening torque: 4 Nm

Use pliers for attaching clip for connecting link of front left vehicle level sender -G78 to track control link between stops.

On installing headlight range control, ensure correct mutual positioning of crank and connecting link.

Note:

Connecting link must be vertical
Crank must face forwards at bottom