General information
1. Xenon headlights are installed on all A4 models as an option. The headlights are equipped with gas discharge lamps that work on the principle of an electric arc, instead of heating up the filament in conventional halogen lamps. The arc is generated by a starter circuit operating at high voltages. The intensity of the radiation of such a lamp implies dynamic control of the direction of light so as not to blind other road users. The control unit monitors the car's pitch and its overall height above the road, receiving signals from sensors installed in the front and rear suspensions. adjusting accordingly the direction of the headlamp's luminous flux by means of the servomotors installed in them.
Attention! Xenon headlights operate at high voltages. Before starting work, to avoid electric shock, disconnect the wire "masses" from the battery.
Lamp replacement
High beam and position lights
2. Bulb replacement is the same as for regular halogen headlights, as described in paragraph 7.
Dipped beam
3. Disconnect a wire of 'weight' from the accumulator.
4. Open the cover at the back of the headlight.
5. Disconnect the wiring connector at the rear of the headlight. To disconnect, turn the locking ring counterclockwise.
6. Remove the bulb from the headlight.
7. Being careful not to touch the bulb bulb, install the new bulb by aligning the notch on the bulb base with the protrusion at the back of the headlamp.
8. Install the locking ring by aligning the notches with the corresponding tabs on the back of the pump flange and turn the ring clockwise to lock it in place.
9. Connect the connector and install the cover. Connect the battery.
Starter block
Withdrawal
10. Disconnect the wire "masses" from the battery.
11. Open the cover at the back of the headlight.
12. Disconnect the electrical connector at the rear of the headlamp.
13. Press the tabs to release the bushing and pull the wiring out through the back cover of the starter block.
14. Disconnect the wiring connector from the starter block.
15. Turn away the screw and disconnect an arm of fastening in a back part of a headlight.
16. Remove the starter block from the headlight.
Installation
17. Installation - reverse procedure.
Front ride height sensor
Withdrawal
18. The sensor is installed between the subframe and the left front wishbone.
19. Disconnect from the gauge an electric socket.
20. Press the latches with pliers and release the rod lock from the suspension arm.
21. Turn away bolts and release the gauge from an arm of fastening.
Installation
22. Installation - reverse procedure.
Rear ride height sensor
Withdrawal
23. The sensor is installed in the middle of the rear beam.
24. Disconnect the wiring connector from the sensor.
25. Turn away a bolt and disconnect a collar of draft from a beam.
26. Turn away bolts and remove the gauge from an arm.
Installation
27. Installation - reverse procedure.
Electronic control unit
Withdrawal
28. The unit is installed on the right under the rear seat cushion.
29. Remove the rear seat cushion as described in chapter 11.
30. Open the sponge container and remove the block. Disconnect the wiring connector from the block and remove the block from the vehicle.
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