The new generation of Audi 90/80 B3 cars was introduced in mid-1986. Produced in 1987, 1988, 1989, 1990 and 1991. Sold around the world under the brands Audi 80 or Audi 90 (denoted vehicles of a higher configuration). In our material you can find a detailed designation of relays and fuses on the Audi 80 90 b3 with box diagrams and their location.
The above tables are universal. Certain components or individual systems may be missing on certain Audi 80 and Audi 90 models. It is also possible that the specified fuses and ratings do not match the fuses installed on your machine. Check with your description on the back of the protective cover.
Contents
Location
Layout
Assignment
- On-board computer / block of automatic diagnostics of car systems;
- Electronic control unit for fuel injection or Electronic control unit of the Motronic system;
- Air conditioner electronic control unit;
- Vehicle position (height) sensor above sea level;
- Electronic ignition control unit;
- Buzzer for turning off the automatic transmission mode;
- Air conditioner control panel;
- Power supply relay for electric seat.
- Electronic control unit for electric seat;
- Additional mounting block;
- Airbag activation unit;
- Safety bag;
- Electronic control unit for automatic transmission;
- Interrupter for hazard warning lights (direction indicators);
- Contact connectors of the diagnostic system;
- Fog lamp connector.
The Audi 80 B3 has two main relay and fuse boxes. One is under the hood, near the wipers. The second is under the dashboard in the cabin.
Passenger compartment relay box
Diagram
Decoding for cars manufactured before 1989
| 1 | ABS relay |
| 2 | Seat belt not fastened warning relay |
| 3 | Interior lighting relay |
| 4 | A / C clutch relay |
| 5 | |
| 6 | Headlight relay |
| 7 | – |
| 8 | – |
| 9 | – |
| 10 | – |
| 11 | – |
| 12 | Reverse current relay (electric seat and rear-view mirrors) |
| 13 | Front passenger seat heater relay |
| 14 | Driver’s seat heater relay |
| 15 16 | Relay for electric sunroof and power windows |
| 17 | – |
| 18 | – |
Decoding for cars manufactured after 1989
| 1 | ABS relay |
| 2 | Seat belt not fastened warning relay |
| 3 | Interior lighting relay |
| 4 | A / C clutch relay |
| 5 | Windshield wiper / washer relay * |
| 6 | Headlight relay |
| 7 | |
| 8 | – |
| 9 | Automatic shift lock relay |
| 10 | – |
| 11 | – |
| 12 | – |
| 13 | Front passenger seat heater relay |
| 14 | Driver’s seat heater relay |
| 15 16 | Relay for electric sunroof and glass lifters |
| 17 | Anti-theft warning light relay |
| 18 | Reverse current relay (electric seat and rear-view mirrors) |
Engine compartment fuse box
This box is located at the rear of the engine compartment.
On the removed cover (7) of the central switch, a short form (6) shows the possible location of the relays and fuses. There are also small plastic pliers for disconnecting the fuses. Inside the central switch are various relays (1), connectors for diagnostic tools (2), fuses 1–21 (3), and additional fuses 23–32 (4). There are four spare fuses (5) below.
Diagram
Designation
For models up to 1989
| No. | Protected circuit elements |
| 1 | 15A Fog lamps for headlights and taillights |
| 2 | 15A Hazard flasher |
| 3 | 25A Horn, brake lamp |
| 4 | 15A Interior lamps, luggage compartment lamp, cigarette lighter fuse audi 80 90, mirror lamp in sun visor, on-board computer, radio tape recorder |
| 5 | 30A Engine cooling fan |
| 6 | 5A Lamp of the side and parking light of the right rear lamp |
| 7 | 5A Lamps of side light and parking light of the left rear lamp |
| 8 | 10A Lamp of a high beam of the right headlight of head lighting, a control lamp of turning on a high beam of headlights |
| 9 | 10A Lamp of a high beam of the left headlight of head lighting |
| 10 | 10A Low beam lamp, right headlight |
| 11 | 10A Low beam lamp, left headlight |
| 12 | 15A Instrument cluster, reversing light lamps, on-board computer, self-diagnosis system unit, Electronic anti-lock braking system control unit, Electronic differential lock control unit |
| 13 | 15A Fuel pump. |
| 14 | 5A Lamps for illumination of the license plate, engine compartment and glove box, illumination lamps of the instrument cluster |
| 15 | 25A Windshield wiper motor, engine cooling fan, ECU, turn signal lamps |
| 16 | 30A Heated rear window, heated rear-view mirrors |
| 17 | 30A The electric motor of the fan (blower) of the passenger compartment ventilation system |
| 18 | 5A Power mirrors |
| 19 | 10A Central locking |
| 20 | 30A Engine cooling fan (first stage) switch, Electronic fan control unit when the engine is running |
| 21 | 25A Rear cigarette lighter |
| 22 | – |
| 23 | 30A Electric motors for adjusting the position of the driver’s seat, memory unit for the position of the driver’s seat |
| 24 | 10A Electronic control unit of the KE-Jetronic or Motronic system |
| 25 | 30A Seat heaters |
| 26 | – |
| 27 | – |
| 28 | 15A Electronic control unit of the Motronic system |
| 29 | 5A Reserve |
Relay table
| I | Fog lamp relay |
| II | Engine cooling fan relay |
| (high speed) | |
| III | Cooling fan ON relay |
| engine when the engine is not running | |
| IV | – |
| V | Unloading relay |
| VI | Air conditioner relay |
| VII | Horn relay |
| VIII | Automatic transmission relay |
| IX | Relay for intermittent operation of the wiper and washer of the windshield |
For models from 1989
- Fog lights, rear fog lights 15
- Hazard warning lights 15
- Horn, heated seats 30
- Clock, luggage compartment lighting, vanity mirror, reading light, socket / cigarette lighter, trip computer, full automatic air conditioning, radio, Auto-Check-System 15
- Second stage of cooling fan speed 30
- Right rear side light, front side light 5
- Left rear side light, front side light 5
- High beam of the right headlight, high beam indicator headlights 10
- High beam left headlight 10
- Dipped beam right, motor for headlight range control on the right 10
- Dipped beam on the left, motor for headlight range control on the left 10
- Instrument cluster, reverse light, Auto-Check-System, automatic transmission, differential lock, on-board computer, control system, driving speed, interior light bulb with delayed shutdown, electronic thermal switch, cooling fan operation after engine shutdown 15
- Fuel pump 15
- License plate light, instrument lighting, engine compartment lighting, glove box lighting, automatic air conditioning 5
- Direction indicators, windshield wipers, windscreen washer pump, heated glass washer nozzles, cooling fan (control unit for turning on the cooling fan after engine shutdown), air conditioning 25
- Rear window heating, heated external rear-view mirrors 30
- Fan, automatic air conditioning 30
- Electric adjustment of external rear-view mirrors, rear window washer (station wagon) 5 15
- Central locking system, heating of the door mechanism cylinders, alarm system 10
- First stage of the cooling system fan, turning on the fan after stopping engine operation 30
- Self-diagnosis / connection of a diagnostic device 10
- Free
- Free
- Free
- Heating of lambda probe 5
- Trailer socket 30
- Ignition / injection system 10
- Ignition / injection system 10
- Stop light 10
- Speed control system in combination with automatic transmission, ABS, differential lock 5 15
- The same
- Ignition / injection system 10
The electric beet lifters, electric sunroof and electric seat adjustment are equipped with automatic fuses, which are automatically switched on again after the fault has been rectified.
Relay
- Fog light relay;
- Spare;
- Relay for turning on the cooling fan;
- Headlight washer relay;
- Unloading relay;
- Engine cooling fan relay;
- Horn relay;
- Automatic transmission relay;
- Relay for intermittent operation of the windshield wiper and washer;
- Fuel pump relay;
- Engine cooling fan relay.
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