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
   Minus is connected to weight
   The help for orientation in the electrotechnical equipment of the car
   Wires
   Connections of wires
   Central switching knot
   Support of additional relays
   Box for electronics
   Relay and control units
   Switching relay
   H-contact of the relay of unloading
   Table of the relay and control units
   Safety locks
   Table of safety locks
   + Electric circuits
   + Accumulator
   + Generator
   + Starter
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics

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Box for electronics

The cover of a box with electronics is fixed by five bolts with six-sided heads (arrow). One of bolts has to unscrew through an opening in a cover under a windshield.


In a box with electronics there is a control unit (2) systems of ignition/injection. In the relay switch (1) the heating relay a lambda probe (the engine with a working volume of 2,6 l) or height sensor is placed (the turbo engine with a working volume of 1,8 l).

To protect sensitive control units of system of ignition/injection from high temperatures which reign in the summer in the car, they were placed in the closed box between a motive compartment and a windshield. To open a box with electronics, it is necessary to unscrew five bolts with six-sided heads. In a box with electronics, except the control unit of the engine, in the car with the engine of 2,6 l there is a control unit of heating a lambda probe.

 Council: The cover of a box with electronics in a moisture protective box has to be closed, otherwise during the movement will blow to the driver in legs.