Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   Indicator of amount of fuel
   Indicator of temperature of cooling liquid
   Auxiliary devices
   Control bulbs above in the combined device
   Control bulb of cooling liquid
   Control bulb of level of brake fluid
   Control bulb of pressure of oil
   Control bulb of indexes of turns
   Control bulbs in devices of a round form (and nearby)
   Control bulb of indexes of turn on the trailer
   Control bulb of ASR
   Control bulb of the lock of ignition
   Control bulb of high beam headlamps
   Control bulb of a safety cushion
   Control bulb of ABS
   Control bulb of the parking brake
   Control bulb of accumulator charging
   System of autocontrol of the car
   Ignition lock
   Check of switches
   Alarm buzzer of lighting
   The warmed back glass
   Check of screen wipers and windscreen washers
   Engine of screen wipers
   The help at malfunctions
   The gulf of liquid for washing of glasses
   System of washing of headlights
   Adjustment of a mirror with the electric drive
   Central lock
   Window regulators with the electric drive
   Sliding/removable roof with the electric drive
   Radio receiver
   The antenna on back glass
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


Check of switches


  1. Needle contact of a control lamp you can pierce isolation of a wire and define in what wire there is tension.
  2. Find the electric circuit for each switch.
  3. In the beginning it is checked whether tension arrives in general on the switch; at the same time it is necessary to include ignition or lighting several times.
  4. Then it is checked whether conductivity in the switch is in the corresponding family way.
  5. On the example of ignition lock switch knot it looks as follows:
  6. Dismantle above and below facing of a steering column as it is described in the section on dismantle of lever switches in this chapter above.
  7. Connect a connecting wire of a control lamp to weight.
  8. Pierce a control tip isolation of the checked wire.
  9. Both plugs 30 of a thick red wire always have to be energized from the accumulator.
  10. The gray/yellow wire of the plug P is in position "Ruhestellung" (rest) of the lock of ignition energized and is cut off power at its turn.
  11. The black/yellow wire of the plug X (and also plugs 75) is energized only in the provision of a key "Zundung ein" (ignition is included).
  12. The thin red wire to the plug 86s is energized until the key is not taken out. Here the radio receiver, and also (for information) the relay of a delay of switching off of illumination of salon and an alarm buzzer in the combined device is connected.
  13. The black wire of the plug 15 receives tension in the provision of a key "Zundung ein" (ignition is included) and "Anlassen" (start of the engine).
  14. The red/black wire from the start signal plug 50 on a starter is energized only in situation "Anlassen" (start of the engine)
  15. At the plug 50b the same function, as at the plug 50, serves for preliminary excitement of the generator already in the course of start of the engine.