The Audi 80 and Audi 90 (B3) is produced between 1986-1991 and is the third generation of Audi’s popular mid-size car. It is available in both sedan and wagon versions and featured numerous improvements over its predecessor, including better handling, more comfortable interior, and improved fuel efficiency.

One of the most important aspects of the Audi 80 and Audi 90 (B3) is its electrical system. The car features a fuse box and relay, which are vital components for ensuring the proper function of various electrical systems within the vehicle. In this article, we will explore the Audi 80 and Audi 90 (B3) in more detail and look at how the fuse box and relay contribute to its performance.

Body

Design and Features

The Audi 80 and Audi 90 (B3) is designed with a sleek, aerodynamic profile that gave it a more modern look compared to its predecessors. The car featured a front-wheel-drive layout and is available with a range of engines, including both diesel and gasoline options. The interior of the car is also improved, with more comfortable seating and a modern dashboard design that incorporated numerous electronic features.

Electrical Components

The Audi 80 and Audi 90 (B3) featured a complex electrical system that is important for the proper function of various components, such as the headlights, radio, and air conditioning. The car’s fuse box and relay played a crucial role in this system. The fuse box is responsible for protecting various electrical circuits from damage due to overloading, while the relay helps to control the flow of electricity to various components.

One common issue with the fuse box and relay in the Audi 80 and Audi 90 (B3) is corrosion. This can cause electrical problems, such as dimming headlights or a malfunctioning radio. It is important to regularly check and clean the fuse box and relay to prevent such issues.

Maintenance and Repairs

Regular maintenance is key to keeping the Audi 80 and Audi 90 (B3) in good working order. This includes checking the fuse box and relay, as well as other electrical components, such as the alternator and battery. If any issues are detected, it is important to have them addressed promptly to avoid more serious problems down the line.

When it comes to repairs, it is important to use quality parts and work with a reputable mechanic who is familiar with the Audi 80 and Audi 90 (B3). This will help ensure that any repairs are done correctly and that the car remains safe and reliable.

(1986-1991) Audi 80 and Audi 90 (B3) fuse box and relay with Diagram

Engine compartment fuse box

1986 1991 audi 80:90 b3 fuse box
1986 1991 audi 80:90 b3 fuse box
No.Assignment/DesignationAmps
1Fog lights, rear fog light15A
2Emergency flashers15A
3Horn, brake lights25A
4Reading lights, luggage compartment, cigar lighter, interior lights, make-up mirror, Board Computer, radio, clock, auto climate control, alarm system15A
5Radiator cooling fan30A
6Side marker, park lights, right5A
7Side marker, park lights, left5A
8Hi-beam headlight, right, hi-beam indicator light10A
9Hi-beam headlight, left10A
10Low beam headlight, right10A
11Low beam headlight, left10A
12Instrument cluster, back-up lights, Auto-Check, cruise control, ABS, Board Computer, differential locks, electronic thermoswitch, throttle valve time control unit, radiator cooling fan after-run control unit15A
13Fuel pump, warm-up regulator15A
14Glove compartment, engine compartment, license plate lights5A
15Windshield wipers, thermoswitch, radiator cooling fan, turn signals, A/C pressure switch25A
16Rear window heat element, outside mirror heat element30A
17Fresh air blower, A/C30A
18Power mirrors, rear window wiper (Coupe)5A
19Central locking system, heated lock system10A
20Radiator cooling fan (step 1), radiator cool fan after-run30A
21Diagnostic10A
21Rear cigar lighter25A
22
23Power seats with memory, power seat control unit30A
24Engine control I10A
25Heated seats30A
26Daytime driving lights (Canada)5A
27Engine Control I (from September 1987)10A
28Engine control II15A
29Spare fuses15A
Relay
IFog lights, J5
IIup to 1990: Radiator cooling tan (stage 2), J101
from 1990: –
IIIRadiator cooling fan after-run control unit, J138
IVup to 1990: –
from 1990: Headlight washer system, J39
VLoad reduction relay, J18
VIup to 1990: A/C fresh air blower, J11
from 1990: Radiator cooling fan high speed relay, J101
VIIHorn, J4
VIIIBridge between contact 36 and 38 for manual transmissions
Auto transmission, J60
IXIntermittent washer/wiper, J31
XFuel pump, J17
XIRadiator cooling fan (stage 1), J26

Auxiliary relay panel

1986 1991 audi 80:90 b3 auxiliary relay panel
1986 1991 audi 80:90 b3 auxiliary relay panel
No.Assignment/Designation
1ABS system, J156
2Seat belt, radio, parking light warning, J152
3Interior light control unit, J140
4A/C clutch control unit, J153
5
6Dynamic oil pressure warning (without Auto-Check), J114
Lamp control unit, front (with Auto-Check), J123
7
8
9
10
11
12Circuit breaker (power seats with memory, power windows, power sunroof), S43
13Seat heater control unit, passenger. J132
14Seat heater control unit, driver, J131
15Sunroof relay, J139
Sunroof and power window control unit, J139
16Sunroof and power window control unit, J139
17Wire distributor adaptor, (optional equipment connector)
18

Overall, the Audi 80 and Audi 90 (B3) is an important milestone in the evolution of Audi’s mid-size car. Its improved handling, modern design, and advanced electrical system set the stage for future generations of Audi vehicles. By understanding the importance of the fuse box and relay in this car, owners can better maintain and repair their vehicles, ensuring that they remain safe and reliable for years to come.

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