Audi Workshop Service and Repair Manuals

Adjusting gas discharge headlights - USA vehicles Requirements for checking and adjusting l  Tyre pressure OK. l  Headlight lenses must be clean and dry. l  Headlight lenses must not be damaged. l  Reflectors and bulbs OK. Vehicle loading: driver's seat occupied, otherwise vehicle unloaded (unladen weight). l  One person or 75 kg. The unladen weight is the weight of the vehicle ready for operation with full fuel tank including the weight of all equipment normally carried. l  Fuel tank: at least 90% full. l  Equipment: e.g. spare wheel, tools, jack, fire extinguisher etc. If the fuel tank is not at least 90 % full, put in additional weight as follows: –  Read off fuel tank level at fuel gauge in instrument cluster, compare with the following table and if necessary, place additional weight in luggage compartment.

Fuel gauge	Additional weight in kg
1/4	45
1/2	30
3/4	15
Full	0
Example: If fuel tank is half full, place an additional weight of 30 kg into luggage compartment.

Note Use canisters filled with water as additional weight (a 5 litre canister filled with water weighs approx. 5 kg). l  Roll vehicle several metres or depress front and rear springs fully several times so that springs settle correctly. l  Release electromechanical parking brake to relieve any load on suspension. l  Vehicle and headlight adjustment unit must be on a level surface.

l  Headlight adjustment unit must be aligned to vehicle → Operating instructions for headlight adjustment unit. l  Position headlight adjustment unit in front of headlight at distance -a- 30 ... 70 cm. Dimension -b- = 3 cm must not be exceeded (measured from headlight centre). l  Dip setting on headlight adjustment unit has been adjusted → Operating instructions for headlight adjustment unit.

l  Dip setting -arrow- is marked on top edge of headlight -1- in „%“.   Note t  Adjust headlights according to dip setting marked on headlight. t  The percentage value is for a range of 10 m. Example: Converting a dip setting of 1,0% = 10 cm. Preparations –  Vehicle must be on a level surface. –  Turn light switch to „dipped beam“ position – not to „Auto“ position. –  Close all doors and the rear lid and keep them closed during the complete checking and adjusting procedure. –  For preparing headlight adjustment, select „Basic setting“ function in „Guided Functions“ mode → vehicle diagnostic tester.   Note With this programme the headlights return to the basic setting. –  Select function or path:

Vehicle brand
	Vehicle type
		Engine code
			55 Dynamic headlight range control J431
				55 Basic setting (Repair Group 94)

–  You will be requested to perform headlight adjustment while running through the programme.

Headlight adjustment l  The horizontal light-dark border should coincide with the setting line -1- of the test surface on the headlight adjustment unit. l  The break-away point -2- between the horizontal section of the light-dark border on the left and the vertical section on the right should coincide with the vertical line running through the central point -3-. The bright spot in the centre of the beam should be to the right of the vertical line.   Note t  To make it easier to find the break-away point -2-, cover and uncover the left half of the headlight (as seen in direction of travel) a few times. Then check the dipped beam again. t  If dipped beams have been adjusted correctly the centre point of the main beam should lie on central point -3-.

–  Before adjusting height of headlight, use adjuster screw -1- to position light-dark border below setting line. –  Then adjust light-dark border to setting line from below. –  Turn adjuster screw -2- for lateral adjustment.   Note The arrangement on the right headlight is symmetrically opposite. –  After completing headlight adjustment, end „Basic setting“, switch off ignition and unplug diagnostic connector.