Service TrainingK-VK-36 2

Electric headlight starter(ignition device)

The start-up characterisation has 4 phases

1. Ignition through high voltage impulse ( a few ms, about 12 to 20 kV ).2. Starting light ( about 15 % ): Limitation of lamp's current and output to about 2.6 A or 75 Watt3. Light changes colour4. Continuous operation ( about 35 Watt ): The electric arc attains its specification which is stabilised by the headlight starter (ballast). (Alternating current with a frequency of 400 Hz)

12 kV

2.6 A/75W

35 W

* The combustion chamber is a pea-sized glass cylinder filled with xenon gas and metallic halide salts. ( pressure about 100 bar )* Electric arc temperature about 700° C* 250 % more light efficient* 5 times the life span* Can be renewed only by trained personnel

ConverterRegulation range

Dynamic headlight range controlDynamic headlight range control

Service TrainingK-VK-36 3

20

19

15

16

Terminal 15Terminal 31Terminal 65b

V signalK wire

Failure warning lightin estate ( Audi only )

G 78

G 76 V 49 right

M

V 48 leftFunctional diagramHeadlight range control

3524

17 10 9

13 14 11 12

1

786

M

Headlight range control CUon left in

luggage compartment

J 431

CAN ( to be used later )

6

2

4

3

3

4

2

6

Dynamic headlight range controlDynamic headlight range control

Service TrainingK-VK-36 4

Vehicle attitude senderG 76 / G 78

Design NN

S

S

Angle of rotation 70°

4.5

2.5

0.50 V

Contactless attitude sender operating on Hall principleThe senders are identical to those of the static headlight range control( see also Trainer Information Audi A6 )

Ring magnet

Stator

Hall sender

High magnetic field density

Low magnetic field density

Dynamic headlight range controlDynamic headlight range control

Service TrainingK-VK-36 5

Headlight range control self-diagnosis

Address word 55

Coding 00007 for front wheel drive00008 for four-wheel drive

Final control diagnosis Lower/raise headlights

Measured value block Channel 001 1 = Voltage supply terminal 15 ( in Volt )2 = Light switch terminal 56b (light on/off )3 = Speed in km per hour4 = Vehicle acceleration in m/s²

Channel 002 1 = Front attitude sender in Volt ( 1.57 to 3.45 Volt )2 = Rear attitude sender in Volt ( 1.57 to 4.5 Volt )3 = Step motor actuation in % ( indicates what percent of the spindle is advanced from the zero position )4 = Time constant in seconds ( time required for 63 % of the adjustment to occur )

Basic setting Channel 01 Regulating mode is switched off Channel 02 Control unit learns the adjusted position

as regulation position

Dynamic headlight range controlDynamic headlight range control

Service TrainingK-VK-36 6

55 Headlight range control4B0 907 357CDynamic HRC D03

7

Voltage supply terminal 15

Light switch off/on

Vehicle speed

Vehicle acceleration in m/s2

12.1 V

0 / 1

0 km/h

0.00- 7.00 m/s2

Coding = 7 7 Front wheel drive

8 8 Four-wheel drive

1

Vehicle self-diagnosis

08 - Read measured value block

Read measured value block

Basic setting

Displaygroup

Coding 7Dealership number 1317

Service TrainingK-VK-36 7

55 Headlight range control4B0 907 357CDynamic HRC D03

7

Front vehicle attitude sender (1.57 to 3.45 V )

Step motor actuation in % ( 0 to 100% ) *

Time constant in seconds ( 0 to 2 seconds ) **

3.1 V

2.3 V

74 %

0.03 s

* indicates what percent of the spindle is advanced from zero postion of step motor

** indicates time required for headlights to attain 63% of their adjustment

2

Rear vehicle attitude sender (1.57 to 4.50 V )

Vehicle self-diagnosis

08 - Read measured value block

Read measured value block

Basic setting

Displaygroup

Coding 7Dealership number 1317

Service TrainingK-VK-36 8

55 Headlight range control4B0 907 357CDynamic HRC D03

7

12.1 V

0 / 1

0 km/h

0.00- 7.00 m/s2

Adjusting headlightsAdjusting headlights

1

For basic settingbasic setting, leave lights on and engine

running

For basic settingbasic setting, leave lights on and engine

running

Vehicle self-diagnosis

03 - Final control diagnosis

Read measured value block

Basic setting

Displaygroup

Coding 7Dealership number 1317

Service TrainingK-VK-36 9

55 Headlight range control4B0 907 357CDynamic HRC D03

7

3.1 V

2.3 V

74 %

0.03 s

2

For basic settingbasic setting, leave lights on and engine

running

For basic settingbasic setting, leave lights on and engine

running

Regulation position being learnt

Regulation position being learnt

Vehicle self-diagnosis

03 - Final control diagnosis

Read measured value block

Basic setting

Displaygroup

Coding 7Dealership number 1317

Service TrainingK-VK-36 10

55 Headlight range control4B0 907 357CDynamic HRC D03

7

3

Headlights will be lowered

Headlights will be raised

Signal wire to combi-instrument

Vehicle self-diagnosis

03 - Final control diagnosis

Read measured value block

Basic setting

Displaygroup

Coding 7Dealership number 1317