Fuses — replacement and purpose (Audi 80 B4)

Each electrical device in a car is designed for a certain voltage. The diameter of the supply cable is calculated taking this voltage into account. If the current consumption in a certain circuit, for example, due to the connection of additional consumers, increases, then the supply cable experiences additional load. It can overheat or even burn out if the current flow is not interrupted in time. This function is performed by fuses. To avoid a complete power outage in the on-board network, each circuit has its own fuse. However, connections to the battery, generator, starter and ignition switch do not have fuses.

To remove and replace fuses, use the plastic clip that is attached to the cover of the central distribution panel (see illustration 3.0).



If a new fuse blows immediately after installation, make sure that the fuse was installed with the correct rating, and not a smaller one. If the rating matches, then check all consumers of this circuit separately. Use the appropriate electrical diagram for this. If necessary, disconnect all consumers of the circuit, and then connect one by one. If the fuse blows when connecting the next consumer, this consumer is faulty.

Purpose of fuses

Main fuses (No., Consumer, Ampere)

1. Fog lights, rear fog lights - 15

2. Emergency alarm - 15

3. Sound signal, seat heating - 30

4. Electronic clock, trunk light, interior light, vanity mirror, reading light, cigarette lighter, trip computer, automatic air conditioning, radio, self-diagnostic system - 15

5. 2nd speed of rotation of the radiator fan - 30

6. Rear right side lights and parking lights - 5

7. Rear left side lights and parking lights - 5

8. Right high beam headlight, high beam indicator light - 10

9. Left high beam headlight - 10

10. Right low beam headlight, right headlight position adjustment motor - 10

11. Left low beam headlight, left headlight position adjustment motor - 10

12. Instrument cluster, reversing lights, control system, automatic transmission, differential lock, trip computer, speed control, interior lighting retarder relay, electronic thermal switch, radiator fan relay — 15

13. Fuel pump - 15

14. License plate light, instrument panel light, underhood light, glove compartment light, automatic air conditioning - 5

15. Direction indicators, windshield wiper, windshield washer pump, windshield washer nozzle heater, radiator fan relay, air conditioner — 25

16. Rear window heating, mirror heating - 30

17. Cabin fan, automatic air conditioner - 30

18. Electric mirrors - 5
Rear Window Wiper (Avant) - 15

19. Central locking, heated lock cylinder, anti-theft system - 10

20. Radiator fan, 1st speed, cabin fan - 30

21. Diagnostic connector - 10

22. Not used (cars with gasoline engines)


Glow plugs (cars with diesel engines) — 80

The electric windows, sunroof and seat adjustment are equipped with automatic fuses that turn on automatically after the cause that caused them to turn off has been eliminated. They are mounted on the additional relay block on the left under the instrument panel. The main fuse for the radiator fan is also located on the additional relay block.

Additional fuses

23. Not used

24. Not used

25. Lambda probe heating. Not used in cars with diesel engines — 5

26. Trailer connector - 30

27. Ignition/fuel injection system - 10

28. Ignition/fuel injection system. Not used in diesel vehicles — 10

29. Brake light - 10

30. Speed control (cars with automatic transmission). Not used in vehicles with diesel engines. - 5

31. ABS, differential lock - 15

32. Ignition/fuel injection system For vehicles with diesel engines TD - fuel cut-off valve - 10