Audi 80 b3 relay diagram. Mounting block in the engine compartment

Fuse box in engine compartment.

The unit is located in the rear left side of the engine compartment.

Decryption:

1. diagnostic connector
2. fuses 1-21. For vehicles with diesel engines, fuse 22.
3. additional fuses 23-32
4. four spare fuses
5. relay designation on the cover of the distribution panel
6. clip for removing and installing fuses

The layout of the fuses and relays in the block.

Decryption:

№	Purpose	Ampere
1	Fog lights, rear fog lights	15
2	Alarm	15
3	Sound signal, seat heating	30
4	Electronic clock, trunk light, interior light, vanity mirror, reading light, cigarette lighter, on-board computer, automatic air conditioner, radio, self-diagnosis system	15
5	2nd radiator fan speed	30
6	Rear right marker and parking lights	5
7	Rear left marker and parking lights	5
8	Right high beam headlight, high beam warning light	10
9	Left high beam headlight	10
10	Right dipped beam headlight, position adjustment motor right headlight	10
11	Left low beam headlight, left headlight adjustment motor	10
12	Instrument panel, lights reversing, control system, automatic transmission, differential lock, board computer, adjustment speed limit, retarder relay for interior lighting with, electronic thermal switch, relay for turning on the fan radiator airflow	15
13	Fuel pump	15
14	License plate light, instrument panel light, engine compartment light, glove box light, automatic air conditioning	5
15	Direction indicators, windshield wiper, washer pump, heated windshield washer jets, radiator fan relay, air conditioning	25
16	Heating rear window, heated mirrors	30
17	Cabin blower, automatic air conditioning	30
18	electric mirrors	5
18	Rear window cleaner (Avant)	15
19	Central locking, lock switch cylinder heating, anti-theft system	10
20	Radiator fan, 1st speed, interior fan	30
21	Diagnostic connector	10
22	Not used (vehicles with petrol engines)
22	Glow Plugs (Diesel Vehicles)	80

Additional fuses, bottom row:

23	Not used	-
24	Not used	-
25	Heating lambda probe. Not available for diesel vehicles	5
26	trailer connector	30
27	Ignition/fuel injection system	10
28	Ignition/fuel injection system. Not available for diesel vehicles	10
29	Stop signal	10
30	Speed ​​control (vehicles with automatic transmission) It is not used in vehicles with diesel engines.	5
31	ABS, differential lock	15
32	Ignition/fuel injection system Vehicles with TD diesel engines - fuel cut-off valve	10

Relay decoding:

1 - relay for fog lights and tail lights. For vehicles without fog lamps, there is a jumper in this place.

2 - radiator blower fan relay (for vehicles without air conditioning), radiator blower fan relay to turn on the 2nd stage of rotation

3 - fan relay

4 - headlight washer relay

5 - X-contact unloading relay

6 - interior blower fan relay (manually controlled air conditioner), air conditioner fan relay for speed at the 2nd stage (automatic air conditioner)

7 - horn relay

8 - horn relay anti-theft system(vehicles with mechanical box gears). Cars without such a system have a jumper. For vehicles with automatic transmission, this place is free.

9 - intermittent wiper relay

10 - fuel pump relay

11 - radiator fan relay for turning on the 1st stage of rotation

*Attention! For vehicles with diesel engines, pos. 2 and 3 are unoccupied and relay 10 is the glow plug relay

Additional relay box in Audi showroom 80 b4.

To access the unit, unscrew 4 screws and remove the cover.

The layout of the relay in the block.

On different modifications cars, not all relays are installed.

Decryption:

1. ABS system
2. Seat Belt Warning Light
3. Interior lighting control unit
4. A/C Clutch Relay Box
5. Rear window wiper and washer
6. Oil pressure monitor, front lighting control unit
7. Not used
8. Not used
9. Automatic shift lock (only for vehicles with automatic transmission)
10. Not used
11. Not used
12. Heated passenger seats
13. Heated driver's seat
14. Car sunroof relay
15. Electric sunroof and door glass control unit
16. Relay signal lamps anti-theft alarm
17. Power door windows, power sunroof, power seat circuit breaker

Relay assignment for diesel engines.

Decryption:

5 - electric current relay

12 - acoustic signal relay (door not closed, seat belt not fastened)

13.14 - EGR control relay

15 - lighting lamp control relay

18 - relay of the 3rd speed of rotation of the radiator fans (usually it is the 2nd speed)

K - radiator fan fuse

S - current fuse

To your " iron Horse» has always worked properly, you need to periodically take time to diagnose it. Including we are talking about the electrical wiring of the vehicle. This material will help you find out where the Audi 80 fuses are located, what they are responsible for and how to change them if necessary.

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Location

Vehicles foreign production for the most part, they are equipped with many electrical appliances that require protection. This is what fuse blocks are used for - in order to protect equipment from overvoltage. Audi 80 b3 or b4 cars, like other foreign cars, are equipped with a fuse and relay box.

The block can be found in engine compartment. After opening the hood, you will see the fuse box (hereinafter referred to as the PSU), which is located under the windshield. It is hidden by a plastic cover designed to keep out moisture and debris.

This fuse box contains 31 parts that protect the wiring circuits. There are also four spare components here. In addition, in this fuse box you can see a special connector that is needed to connect a tester to diagnose the on-board computer. The fuse diagram and table of their purposes is shown below.

PSU scheme

This scheme is relevant for Audi 80 b3 and b4 cars.

As noted above, in Audi 80 b3 and b4 cars, not only fuses, but also relays are responsible for the safety of devices. These components are responsible for the operation electric windows, an electric sunroof, if any (depending on the configuration) and a device for adjusting the positions of the front seats. There is also a device responsible for the functioning of the radiator fan of the cooling system.

Purpose

Now let's move on to the purpose of the components of the PSU. The tables are shown below.

As for the relay, then, apparently, this information will also be useful to you.

Serial number	What protects
1	Ensures safe operation of lamps fog lights and rear dimensions, as well as the bridge, if vehicle not equipped with foglights.
2	This part protects the fan from failure. cooling system(relevant for vehicles not equipped with a climate control system).
3	Provides the functionality of the control unit for activating the ventilated unit after the engine is turned off.
4	This device allows the headlight washer system to function safely.
5	Unloading component of the X-contact.
6	For vehicles with manual air conditioning, this component performs the function of protecting the fan circuit, and on cars with an automatic climate control system and some other engine variations, the sixth number indicates the relay responsible for the functioning of the second cooling system fan.
7	Responsible for the operation of the steering horn.
8	This number allows you to ensure the operability of the alarm system in Audi 80 vehicles equipped with a manual transmission. If your vehicle is equipped automatic transmission, then this place will remain open.
9	Intermittent Wash Rate Component windshield.
10	Audi 80 petrol pump.
11	The first fan of the cooling system.

Quite in operation a large number of cars from the AUDI family. They have proven to be reliable, comfortable cars. In their equipment there is a large number of equipment that uses power from onboard network car. A fuse block is used to protect against its failure. This module is designed to install 28 protective devices, several of them are spare.

To facilitate detection and replacement faulty device manufacturers adopted a single condition for designating the allowable current for all color code in all Audi units.

This block is placed in the engine compartment of the Audi 80. In addition to fuses, it has electromagnetic relays. The main purpose of their installation is to protect against wear and tear. high current switch contacts, steering column switch, other devices. There are 11 such relays in the module. Separate vehicle modifications may have wire jumpers instead of electromagnetic relays. That's why check the diagram of the fusible links on the cover of your car with the description of the module.

Advice! It is impossible to install a device with a large rated value of the transmitted current to replace a burned-out fuse-link.

If this condition is not observed, expensive electronic equipment may fail. There have been many cases of electrical wiring fires due to this.

The block diagram of the Audi 80 b3 fuses, the diagram of which is shown below, differs from other, later models of this family.

The relays in the mounting module are responsible for connecting the following consumers of the vehicle's on-board voltage:

1. Fog lights, tail lights. In that case when fog lights missing, a jumper wire will be installed;
2. Second fan for cooling power unit;
3. Turns on the fan in the engine cooling system after it stops;
4. Headlight cleaning system connection module;
5. Relay X contact;
6. The second fan (relay) for cars with an automatic air conditioning system;
7. klaxon;
8. alarm system;
9. Intermittent wiper mode;
10. Electric fuel pump;
11. The first fan in the cooling system.

The Audi 80 b3 fuse box has another module located inside the car. In it, depending on the modification and configuration, 18 relays can be installed. Some of them may not be required. They will provide power to the following consumers:

1. ABS system;
2. Alarm about not fastened seat belt;
3. Relay for switching on internal lighting;
4. Air conditioner clutch;
5. Temporarily unused;
6. head lighting;
7. Temporarily unused;
8. Temporarily unused;
9. Temporarily unused;
10. Temporarily unused;
11. Temporarily unused;
12. Relay supplying reverse current for electric seats and rear-view mirrors;
13. Heating of the passenger seat;
14. Heat driver's seat;
15. Electric drive for sunroof, power windows;
16. The same consumers;
17. Not used;
18. Not used.

A little about the electrical equipment of the Audi 80 b4

This car is a later release, so it is more perfect. It also has protective fusible links in the electrical system of the machine. This model in its electrical equipment has diagnostic connector. They connect to it service equipment to service the machine. The Audi 80 b4 block has 21 fuses, in models with diesel engine one more, plus two additional appliances.

There was also a place in the block for installing spare fuses in the amount of 4 pieces. For the convenience of detecting and replacing a faulty fuse-link with a new one, the cover has symbols with applied consumers and the nominal value of the permissible current. There is also a pair of tweezers for easy removal and installation of elements. In these models, the fuse box is also mounted in the engine compartment. If you look closely in the engine compartment, you can see a mounting block under the windshield.

Advice! The detection and replacement of a failed fuse in the Audi 80 unit is carried out with the engine turned off.

Before installing a new protective fuse in the unit, it is necessary to find and then eliminate the cause of the failure of the Audi 80 fuse. Why is this necessary? Burnout of the fuse-link is possible only when the current consumption is exceeded. It can occur after a short circuit in consumer circuits, when these consumers fail. If this problem is not corrected, the fuse links will burn out.

In conclusion, I would like to remind you once again that modules with fuses different models are different. So, the Audi 80 b2 fuse box is different from the b3, b4 models.

In an Audi 80 car in the back of B3 and B4, regardless of the configuration and specific model, there are 2 complementary fuse boxes. Designations are given after the introductory part of the article. They perform various functions, and on-board equipment is connected to them. So, in the block located in the engine compartment, there are power fuses and relays that ensure the operation of large current consumers: a gasoline pump, headlights, wipers, air conditioning, a cooling fan, an ignition system, a horn, etc. The unit located in the cabin (it is often called additional) is responsible for the operation of devices without which the operation of the car is not comfortable .

If the electrical equipment of the car is in good condition, then the fuses burn extremely rarely - usually the cause of such a malfunction is a human factor.

Why fuses burn

A frequent contender for replacement is the cigarette lighter fuse. It is located in a block located in the engine compartment, and is additionally responsible for the operation of the audio system, on-board computer, interior and trunk lighting, and illumination of the mirror in the visor. Connecting a powerful compressor to the cigarette lighter for inflating tires, an inverter or other equipment with high consumption current often leads to the failure of the fuse. It is not recommended to replace it with elements with a different rating, as this may lead to a malfunction of the wiring. And its repair is much more expensive than the cost of the fuse.

Lamp installation high power may also cause the fuse to blow. Also, powerful lamps get very hot, which negatively affects the reflector and glass (especially if they are made of plastic). As a result of heating, the plastic glass of the block headlight begins to transmit light worse, which negatively affects the operation of the headlights. Constantly failing fuses can cause the complete loss of the head light, which makes the operation of the machine impossible. The maximum permitted power of the bulbs is indicated in the instruction manual and on the headlights of the car.

Independent, unskilled, intervention in the on-board electrical system of the car is also quite common cause failure of electrical equipment.

Exceeding the rated load on the fuses, poor-quality insulation - all this can easily cause them to burn out. It is not recommended to replace burned-out elements with wires, coins, or set a higher denomination - this can lead to a fire in the wiring.

Mounting block in the engine compartment

If the fuel pump stops working, the first thing to do is check its fuse. To do this, you need to open the hood of the Audi 80 b3 and look into the niche near windshield With driver's side. In this place there is an Audi 80 fuse box, a relay and a diagnostic connector for connecting the car to a computer.

Useful article: We adjust the handbrake of the Audi 80 B3 car on disks or drums

For Audi 80 to 91, the fuel pump fuse is number 13 in the top row, its rating is 15 amps. In total, there are 21 elements in the block (for models with a diesel engine out of 22), also in wiring diagram there are additional fuses used depending on the modification and configuration of the car.

Additionally, the following relays are located in the mounting block:

• fuel pump relay;
• relay for fog lights rear dimensions(if not included in the package, then a jumper is installed in this place);
• starter relay;
• horn relay;
• turns relay;
• climate control relay;
• wiper relay;
• headlight washer relay, fan, security system etc.

On the cover of the mounting block there is a diagram of elements, there is also a decoding in the manual for the Audi 80 b3 car.

For the Audi 80 b4 brand, the location of the mounting block is completely similar, with the exception of the total number of elements and their purpose. So, the fuel pump at b4 is connected to element No. 12, and the location of the relay also differs from model b3.

In the event of a malfunction with electrical equipment, you should first check the integrity of the fuses located in the engine compartment of the car. Even if the speedometer has stopped working, then with a good degree of probability the reason may be hiding in the fuses, it is much easier to notice their integrity than to disassemble the instrument panel and directly check its elements for a malfunction.

Experienced drivers use the fuse responsible for the operation of the fuel pump as follows: often in winter, unsuccessful attempts to start the engine lead to the fact that the candles are “filled” with gasoline, as a result of which the car cannot be started. To dry the spark plugs, just pull the pump fuse out of the block and turn the engine with the starter for a few seconds - the fuel supply will stop, and due to ventilation, they will dry out pretty quickly.

Additional fuse box

To gain access to the additional unit located in the passenger compartment, it is necessary to unscrew the four screws securing the cover located under the steering wheel.

The complete set of the additional block depends on the modification of the car, and often not all elements of the circuit may be involved.

IN additional block installed automatic fuses that cut off when short circuit in the network - after the malfunction is eliminated, they will turn on by themselves.

IN saloon block contains the following components electrical circuit car:

• common fuse;
• climate control or air conditioning control unit;
• automatic transmission control unit and ABS system;
• control unit for electric motors of windows and sunroof;
• electronic engine control unit;
• heating control for driver and passenger seats (separate blocks for each);
• power seat control;
• head light control system;
• interior lighting;
• belt and airbag control;
• oil pressure warning system, closed doors etc.

Useful article: What is the best spark plug for Audi 80?

Also in the wiring diagram there are unused elements (reserve), to which you can connect optional equipment: amplifier for speaker system, burglar alarm, electric trunk lock and others additional devices and electrical equipment.

Trust the installation of new devices or the repair of electrical wiring in an Audi 80 car should only be trusted by professionals - otherwise there is a high risk of ignition of the wiring.

If the fuses in the car suddenly blown, the cause of the malfunction must first be eliminated, otherwise they will continue to burn.

Some videos will help you

New generation of cars Audi 80 b3 was introduced in mid-1986. Produced in 1987, 1988, 1989, 1990 and 1991. Sold worldwide under brands Audi 80 or Audi 90 (denoted cars of a higher configuration). The most common nickname in the CIS is "Barrel". In our material you can find detailed description relays and fuses for Audi 80 90 b3 and their locations.

The given tables are universal. Some components or individual systems may be missing on certain Audi 80 and Audi 90 models. It is also possible that the indicated fuses and ratings may not coincide with installed fuses on your car. Please refer to your description on the back of the protective cover.

1. Board computer / unit automatic diagnostics vehicle systems;
2. The electronic unit fuel injection control or Electronic control unit of the Motronic system;
3. Electronic control unit for air conditioning;
4. Vehicle position (height) sensor above sea level;
5. Electronic ignition control unit;
6. Shutdown buzzer automatic mode gearbox operation;
7. Air conditioning control panel;
8. Seat power relay.
9. Electronic power seat control unit;
10. Additional mounting block;
11. Airbag activation unit;
12. Airbag;
13. Electronic control unit automatic box gear;
14. Breaker for emergency light signaling (direction indicators);
15. Contact connectors of the diagnostic system;
16. Fog lamp connector.

Audi 80 b3 has two main relay and fuse boxes. One is under the hood, near the wipers. Second under dashboard in the cabin.

Relay mounting block in salon

Decryption for cars manufactured before 1989

Relay No. in the figure above	Name
1	ABS relay
2	Alarm relay not fastened belt security
3
4	A/C Clutch Relay
5
6	Relay for headlights
7	-
8	-
9	-
10	-
11	-
12
13
14
15	The relay of the electric drive of the sunroof and power windows
17	—
18	-

Decryption for cars produced after 1989

Relay No. in the figure above	Name
1	ABS relay
2	Seat Belt Warning Relay
3	Interior lighting relay
4	A/C Clutch Relay
5	Windshield wiper/washer relay*
6	Relay for headlights
7
8	-
9	Shift Lock Relay
10	-
11	-
12	-
13	Passenger Seat Heater Relay
14	Driver Seat Heater Relay
15	The relay of the electric drive of the sunroof and glass lifts
17	Anti-theft warning light relay
18	Relay reverse current(power seats and rear-view mirrors)

Central Fuse Distribution Panel

This unit is located at the rear of the engine compartment.

On removed cover(7) the central switch in 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, various relays (1), diagnostic plugs (2), fuses 1-21 (3), and additional fuses 23-32 (4) are visible. Next are four spare fuses (5).

Scheme

Table for Audi 80, 90 up to 1989

№	Elements of the protected circuit
1	15A Lamps fog light headlights and taillights
2	15A Hazard light interrupter
3	25A Horn, brake lamps
4	15A Interior lamps, lighting lamp luggage compartment, audi 80 90 cigarette lighter fuse, sun visor mirror lamp, trip computer, radio
5	30A Engine cooling fan
6	5A Lamps for position and parking light of the right rear lamp
7	5A Lamps side light and parking light of the left tail lamp
8	10A High beam lamp of the right headlight, control lamp turning on high beam headlights
9	10A High beam lamp of the left headlight
10	10A Dipped beam lamp of the right headlight
11	10A Dipped beam lamp of the left headlight
12	15A Instrument cluster, reversing lamps, on-board computer, self-diagnosis system unit, electronic control unit for anti-lock brakes, electronic control unit for differential lock
13	15A Fuel pump.
14	5A Lamps for lighting the license plate, engine compartment and glove box, lamps for lighting the instrument cluster
15	25A Windshield wiper motor, engine cooling fan, A/C ECM, turn signal lamps
16	30A Rear window heater, rear-view mirror heater
17	30A Fan motor (supercharger) of the interior ventilation system
18	5A Electric drive of rear-view mirrors
19	10A Central lock
20	30A Engine Cooling Fan (First Stage) Switch, Engine Running Fan Electronic Control Unit
21	25A Rear cigarette lighter
22	—
23	30A Driver's seat adjustment motors, driver's seat position memory unit
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

Number	Name
I	Fog light relay
II	Engine cooling fan relay
	(high speed)
III	Cooling fan relay
	engine with engine off
IV	-
V	Unloading relay
VI	A/C relay
VII	Horn relay
VIII	Automatic transmission relay
IX	Relay intermittent mode windshield wiper and washer operation

List for Audi 80, 90 models from 1989

1. Fog lights, rear fog lights 15
2. Emergency light signaling 15
3. Horn, heated seats 30
4. Clock, lighting luggage compartment, vanity mirror, reading light, socket/cigarette lighter, trip computer, fully automatic air conditioning, radio, Auto-Check-System 15
5. Second stage cooling fan speed 30
6. Right rear side light, front position light 5
7. Left side tail light, front side light 5
8. high beam right headlight, high beam indicator 10
9. High beam left headlight 10
10. Right dipped beam, right headlight range control motor 10
11. Dipped beam left, headlight range control motor left 10
12. Instrument cluster, reversing lamp, auto-check system (Auto-Check-System), automatic transmission, differential lock, on-board computer, control system, speeds, interior light bulb with turn-off delay, electronic thermal switch, operation of the cooling fan after operation has stopped engine 15
13. Fuel pump 15
14. License plate light, instrument light, engine compartment light, glove box light, automatic air conditioning 5
15. Direction indicators, windshield wipers, windshield washer pump, heated windshield washer nozzles, cooling system fan (control unit for switching on the cooling system fan after the engine stops), air conditioning 25
16. Heated rear window, heated exterior mirrors 30
17. Fan, automatic air conditioning 30
18. Electric adjustment of external rear-view mirrors, rear window washer (station wagon) 5 15
19. Locking system with central administration, cylinder heating mechanism for painting doors, alarm 10
20. The first stage of the fan of the cooling system, turning on the fan after the engine stops 30
21. Self diagnosis/diagnostic tool connection 10
22. Free -

The electric beet lifters, the electric sunroof and the electric seat adjustment are equipped with automatic fuses, which are automatically switched on again after the malfunction has been eliminated.

23. Free -
24. Free -
25. Heating lambda probe 5
26. Trailer socket 30
27. Ignition/injection system 10
28. Ignition/injection system 10
29. Stoplight 10
30. 31. Speed ​​control system combined with automatic transmission, ABS, differential lock 5 15
32. Ignition/injection system 10

relay list

1. Fog light relay;
2. Spare;
3. Relay for turning on the cooling fan;
4. Headlight washer relay;
5. Unloading relay;
6. Engine cooling fan relay;
7. Horn relay;
8. Automatic transmission relay;
9. Relay for intermittent operation of the wiper and washer of the windshield;
10. Fuel pump relay;
11. Engine cooling fan relay.

Additional Information

Check out this video. Here you can clearly see how to access the fuse panel in the B3 model.

Repair and maintenance book

If you want to know more, download the free book on the repair and operation of the Audi 80 b3: ""