A set of electronic circuits for the popular production car Audi 100 will help the car mechanic to repair the car. The general information of all schemes is given in detail, as well as the injection device KE III - Jetronic.
The Audi brand car, model 100, became a very common car in its years. It was produced from 1982 to 1991 inclusive, and during this period of time approximately 1,078,443 cars (sedan and station wagon) were produced from the assembly line. These front-wheel drive cars had petrol engines with different displacements, ranging from 1.6 liters to 2.3 liters, as well as 2.0 liters, 2.4 liters and 2.5 liters turbodiesel. The gearbox also went to choose: automatic or mechanics. The advantages of such German transport were the well-thought-out aerodynamics of the body (drag coefficient 0.30). Such indicators of the Audi 100 helped to significantly save fuel, and a very spacious interior did not leave indifferent more than one buyer, to this day it is very roomy and comfortable even among new released cars.
KE III injection scheme - Jetronic
(motor 100 kW)
- A - battery;
- D - ignition lock;
- E17 - start blocking switch and reversing light switch;
- G39 - lambda probe (2341) (2342);
- J21 - fuel injection control unit;
- J60 - automatic transmission relay;
- N17 - starting nozzle (4443);
- N71 - idle speed stabilization valve (4431);
- N73 - pressure regulator for Audi 100 (4341);
- N80 - solenoid valve 1 for the device for catching fuel vapors (4343);
- S19 - fuse in the fuse box;
- S28 - fuse for the control unit KE III - Jetronic;
- T1a - 1-pin connector on the left in the engine compartment;
- T1e - 1-pin connector (black) behind the instrument panel;
- T2f - 2-pin connector on the left in the engine compartment;
- T2x - 2-pin connector (black) behind the instrument panel (diagnostic);
- T2u - 2-pin connector (brown) behind the instrument panel;
- T3d - 3-pin connector (black) behind the instrument panel;
- T4a - 4-pin connector behind the instrument panel;
- T6a - 6-pin connector behind the instrument panel;
- T6s - 6-pin connector behind the instrument panel;
- T8a - 8-pin connector (black) behind the instrument panel (coding);
- T10d - 10-pin connector (yellow) behind the instrument panel;
- Z19 - heating of the lambda probe.
General information about wiring diagrams Audi 100
(on the example of the injection scheme KE III - Jetronic)Most electrical consumers are connected to ground with brown wires. For the correct connection of electrical equipment, their contacts are numbered.
For ease of use, all electrical circuits on the electrical diagrams are arranged vertically and numbered.
At the top of the diagrams, a fuse and relay box is shown, bounded from below by a horizontal line. The thin lines above it are the inner connections in the block.
The horizontal lines in the block numbered 30, 15, X and 31 are the internal connections of the block with power supplies and ground. Circuit 30 is constantly under battery voltage, circuit 15 - only when the ignition is on and receives power through the ignition switch. Circuit X is energized also when the ignition is on, but when the starter is turned on, it is de-energized. Circuit 31 is connected to ground.
From the bottom of the diagrams there is a horizontal line that shows the connection to the ground.
The circled numbers near the intersection of the vertical chains with the horizontal ground line indicate the location of the ground points on the body.
The number in the white square at the end of the vertical chain indicates in which chain you need to look for the continuation of this wire. The colors of the wires in the diagrams correspond to the colors of the wires on the car. The number on each wire means the cross-sectional area of \u200b\u200bthe conductive core of the wire in square millimeters.
The number in the black square indicates the number of the relay in the fuse and relay box, the letter in the circle next to the wire indicates the permanent connection of the wires.
Internal connections (thin lines) - these connections are not wires, but they carry an electric current. They make it possible to trace the path of current flow inside electrical equipment.
Terminal 15 - when the ignition is on, it has battery voltage.
Position number of the relay – designates the relay, designates the number of the relay on the additional relay panel.
The wire cross section is given in mm2.
Element designation - allows you to find the name of the element represented by a graphic symbol in the list.
Wire color - matches the color of the wire in the car.
Contact designations are on the relay, control device and on the board or additional relay panel.
Alphanumeric designation at the joints - determines the position of the wires in the connectors (M30az).
The numbers in the boxes - indicate the interruption of the circuit and set the number of the current track of the continuation of the circuit.
Alphanumeric designation - marks a detachable connection (T8a / 7).
In any modern vehicle, all electrical consumers are designed for a certain voltage, for which the wiring and electrical equipment are designed.
However, sometimes it can happen that the insulation of the wiring is damaged or the electrical appliance itself fails and, as a result, a short circuit and a power surge. As a result, a current can flow through the wiring, which significantly exceeds the allowable rate. If you're lucky, the wiring will melt, and if not, the car may catch fire.
To prevent this from happening, all vehicles, including the Audi 100 C4, are provided with wiring protection using special fuses. They are designed for the maximum permissible voltage of consumers, if it is exceeded, the protective element will simply burn out, while the problem area in the electrical circuit will be de-energized.
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Where is?
In an Audi 100 C4 car in a 45 body, fuse blocks for ease of control and replacement are located in two fairly accessible places. The first on the left side of the dashboard and the second in the engine compartment under the cover.
Some modifications of the 100 C4 have additional equipment protected by thermal fuses, which are placed under the hood on the left. These elements are self-healing. In the event of an overload, this element breaks the circuit. After a certain time, after it cools down, the circuit will be restored.
Layout plan
The layout of the electrical fuses in the passenger compartment of the Audi 100
The layout of the electrical fuses in the engine compartment of the Audi 100
The request returned an empty result.
Preparation
This is how the fuse indicator works.
If your electrical appliance has stopped working, in most cases the fuse is the culprit. It is very inconvenient to go through all the protective elements, so you need to use the scheme. It is quite simple and even a novice motorist can figure it out. The fuse number is written on the left, then what current it is designed for, and the last column indicates the equipment for which it is responsible. The color of the fuse depends on its rating:
- red - 10 amperes;
- blue - 15 amperes;
- yellow - 20 amperes;
- white - 25 amperes;
- green - 30 amps.
Removal and replacement process
Replacement in any of the Audi 100 C4 blocks is almost the same. Therefore, we will describe the replacement process on the block located on the left side of the dashboard.
- Electrical fuses must be installed, strictly observing their rating. If, after installing the fuse, it blows again, then the cause is faulty equipment, or wiring.
- Do not use metal objects of any kind in place of fuses, as this may damage both circuits and equipment, and in the worst case, may cause a fire.
- Always carry spare fuses of different ratings with you for possible replacement. Perhaps a breakdown will occur on the road and then this reserve can help out well.
Video "How to make a replacement"
This video, using the example of a Skoda car, shows how work should be done to determine a blown fuse and how to replace it. On an Audi car, work is carried out in a similar way.
Audi 100 C3- the general name of a whole family of cars. In the US, they were sold under the name Audi 5000. And the Audi 200 is a more expensive version of the Audi 100, with a higher level of equipment. But in fact it is all the same model. Audi 100 C3 (44 body) was produced in 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989 and 1990. This material provides information on the location of fuses and relay boxes for this series with their detailed description.
Locations of fuses and relays
Main unitlocated in the engine compartment, near the wipers.
The rest are in the car. More details on the diagram.
1 - ignition switch (possible position); 2 – additional relay block; 3 - control unit of the cruise control system; 4 – the relay of indexes of turn; 5 - diagnostic unit; 6 - air conditioner control unit; 7 – altitude sensor; 8 - control unit for the KE-Jetronic fuel injection system; 9 - control unit for front seats with electric adjustment; 10 - control unit for anti-blocking brake system; 11 - battery (for cars with air conditioning); 12 – the relay of the fuel pump of the engine; 13 - lamp control unit in the rear lights.
Main unit fuse description
To access, remove the protective cover by unfastening the clips. Your fuse locations are shown on the back of the fuse box and may differ from this material.
Schema decoding
| Number | Circuits protected by fuses |
| 1 | Fog lights |
| 2 | Direction indicators (in alarm mode) |
| 3 | Sound signal. Cigarette lighter. Card illumination lamp. Interior lighting fixture. Passenger's mirror lamp. Lamp for lighting the lower part of the cabin |
| 4 | Stop lamp. Luggage compartment lamp |
| 5 | Spare |
| 6 | Right headlight (side light). Right rear light (side light) |
| 7 | Left headlight (side light). Left rear light (side light) |
| 8 | Right headlight (high beam). Control lamp of inclusion of a high beam of headlights |
| 9 | Left headlight (high beam) |
| 10 | Right headlight (low beam) |
| 11 | Left headlight (low beam) |
| 12 | Instrument cluster illumination lamps. Reversing lamps. Onboard control system unit |
| 13 | Fuel electric pump |
| 14 | Instrument lighting lamps. License plate lamps. Glove box light. Engine compartment lamp |
| 15 | Windshield wiper motor. Direction indicators (in turn signal mode) |
| 16 | Rear window heating element |
| 17 | Heater fan motor. AC fan motor |
| 18 | Sunroof motor |
| 19 | Centralized door lock system. Electric motor for drive of external rear-view mirrors |
| 20 | Front seat heating elements |
| 21 | Rear cigarette lighter |
| 22 | Diesel engine heater |
| A | Spare |
| IN* | Power seat adjustment memory, front |
| E* | Power window motors |
| F | Tow hitch |
| I | Spare fuses |
Additional relay box in the cabin of the Audi 100 C3
Relay diagram description
| Decoding of the additional relay block | ||
| N relay | Name | Catalog number |
| I | Brake pad wear indicator relay | 431 951 253 A |
| II | Seat heating relay | 431 951 253 A |
| III | impulse relay | 813 906 064 |
| Additional starting relay for the automatic vehicle activation system | 431 951 253 A | |
| IV | delay relay | 433 919 577 |
| Relay for turning on and off the heating of the rear window of the system for automatically bringing the car to working condition | 431 951 253 A | |
| V | Emergency oil pressure warning lamp relay on a car: | |
| – with 4-cylinder petrol engines | 433 919 082 | |
| – with 5-cylinder petrol engines | 433 919 082 | |
| - with 5-cylinder diesel engines | 433 919 082 A | |
| Relay of a control lamp of not fastened seat belts | 443 919 469 | |
| VI | The relay of inclusion of a sound signaling device of not fastened seat belts | 857 919 439 |
| Fog lamp relay | 431 951 253 F | |
| Relay for turning on outdoor lighting when driving in the daytime | 431 951 253 D | |
| Anti-theft relay | 437 927 827 | |
| signaling | ||
| VII | Overvoltage relay | 437 927 825 |
| VIII | Time relay | 431 951 253 B |
| IX | Safety relay | 431 951 253 B |
| air conditioner | ||
| X | 431 951 253 B | |
| XI | The relay of inclusion of the electric motor of the fan of the cooling system | 431 951 254 B |
| XI-XII | Electronic cooling fan motor control unit | 443 907 393 |
| XIII | Reserve | |
| XIV | Relay for switching on the rear window cleaner | 171 955 529 |
| XV | Injector cooling relay | 431 951 253 A |
| XVI | Relay for switching on the dipped headlights | 431 951 253 C |
| Turn signal relay | 431 951 253 A | |
| Electronic control unit | 55 906 086 | |
| XVII | High Beam Relay | 431 951 253 A |
| High power horn activation relay | 431 951 253 A | |
| Relay for enrichment of the combustible mixture | 431 951 253 C | |
| XVIII | Ignition relay | 431 951 253 A |
| Oxygen A/C Sensor Relay | 431 951 253 A | |
Additional Information
A small video review of the car.
Download repair book
DetailsIn a car, each electrical device consumes a certain current; the cross section of the wire supplying this consumer is calculated for this current. But nothing lasts forever in this life, over time, the insulation of the wires may deteriorate somewhere or the electrical consumer itself may fail, as a result, we may experience an excess load or a short circuit. As a result, a current exceeding the allowable will run through the wires. In the best case, a part of the wiring will melt, in the worst case, we will lose the car. To prevent this, fuses are installed in the car, which are designed for the maximum allowable current of devices, when exceeded, the fuse blows, de-energizing the faulty section of the circuit. In the car, all areas are protected fuses, except for the following circuits: between battery, alternator, starter and ignition switch.
The fuse box in the audi c4 is located on the left side of the instrument panel, under the cover.
Fig 1 - Audi c4 fuse box cover.
Fig 2 - Audi c4 fuse box.
If any electrical consumer has failed you, most likely, the fuse has blown, so as not to go through all the fuses, you can use the following list. On the left is the fuse number, its power in amperes and its consumer. The fuse rating can be distinguished by its color:
- red - 10A
- blue - 15A
- yellow - 20A
- white - 25A
- green - 30A
Fig 3 - Fuse numbers in Audi c4.
Audi c4 fuse list
| Fuse | Ampere | Protected circuit |
| F1 | 10A | Right high beam headlight and high beam warning light |
| F2 | 10A | Left high beam headlight |
| F3 | 10A | Right low beam headlight |
| F4 | 10A | Left low beam headlight |
| F5 | 5A | Right marker light |
| F6 | 5A | Left marker light |
| F7 | 5A | Lamps for license plate, glove compartment, engine compartment, temperature control panel, ashtray and instrument panel |
| F8 | 15A | Clock, map lights, trunk light, lighter, interior lights, visor lights, trip computer, door mirror adjusters, programmable seat controls |
| F9 | 10A | Stop lights |
| F10 | 15A | Alarm signal lamp |
| F11 | 30A | Furnace fan, air conditioner |
| F12 | 30A | Heated rear window and rear-view mirrors |
| F13 | 25A | Wipers, turn signals, cooling fan, sprinkler heaters, transmission oil temperature sensor |
| F14 | 15A | Reversing lights, wipers, cruise control, differential lock, multi-function gauge, speedometer gauge, water filter, automatic transmission |
| F15 | 5A | Dashboard, rear-view mirrors, trip computer |
| F16 | 15A | Fog lights |
| F17 | 20A | Fuel pump, warm-up valve |
| F18 | 15A | Rear window wiper |
| F19 | 25A | Diagnostic system, horn, fan relay |
| F20 | 5A | Cruise control system, automatic transmission |
| F21 | 15A | ABS |
Fuses must be installed exactly at their nominal value. If you changed the fuse, and it blown again, then in this case you need to look for the cause, either in a faulty consumer or in the wiring.
On some Audi C4 cars, with additional equipment, a number of thermal fuses are installed in the engine compartment on the left side.
Figure 4 - Relay box under the hood.
As a rule, these fuses are self-healing, that is, if some kind of overload occurs, then this fuse breaks the circuit, after a while, when the element in the fuses cools down, it restores the circuit.
Fig 5 - Additional thermal fuses.
If you have any questions or suggestions regarding this article. Welcome to
| Fuse number | Rated current, A | Circuits protected by fuses |
| 1 | 15 | Fog lights |
| 2 | 15 | Direction indicators (in alarm mode) |
| 3 | 25 | Sound signal. Cigarette lighter. Card illumination lamp. Interior lighting fixture. Passenger's mirror lamp. Lamp for lighting the lower part of the cabin |
| 4 | 15 | Stop lamp. Luggage compartment lamp |
| 5 | - | Spare |
| 6 | 5 | Right headlight (side light). Right rear light (side light) |
| 7 | 5 | Left headlight (side light). Left rear light (side light) |
| 8 | 10 | Right headlight (high beam). Control lamp of inclusion of a high beam of headlights |
| 9 | 10 | Left headlight (high beam) |
| 10 | 10 | Right headlight (low beam) |
| 11 | 10 | Left headlight (low beam) |
| 12 | 15 | Instrument cluster illumination lamps. Reversing lamps. Onboard control system unit |
| 13 | 15 | Fuel electric pump |
| 14 | 15 | Instrument lighting lamps. License plate lamps. Glove box light. Engine compartment lamp |
| 15 | 15 | Windshield wiper motor. Direction indicators (in turn signal mode) |
| 16 | 30 | Rear window heating element |
| 17 | 30 | Heater fan motor. AC fan motor |
| 18 | 25 | Sunroof motor |
| 19 | 10 | Centralized door lock system. Electric motor for drive of external rear-view mirrors |
| 20 | 30 | Front seat heating elements |
| 21 | 25 | Rear cigarette lighter |
| 22 | 80 | Diesel engine heater |
| A | 10 | Spare |
| IN* | 15 | Power seat adjustment memory, front |
| E* | 30 | Power window motors |
| F | 30 | Tow hitch |
| I | - | Spare fuses |
* Automatic circuit breakers that open the circuit when overloaded and close it after a short period of time.
Additional relay box under the instrument panel
The location of the relay and control units on the car: a - the location of the relay and control units on the instrument panel; b - location of control units in the passenger compartment; c - location of the control unit in the luggage compartment
 |
1 - ignition switch (possible position); 2 – additional relay block; 3 - control unit of the cruise control system; 4 – the relay of indexes of turn; 5 - diagnostic unit; 6 - air conditioning control unit; 7 – altitude sensor; 8 - control unit for the KE-Jetronic fuel injection system; 9 - control unit for front seats with electric adjustment; 10 - control unit for anti-lock braking system; 11 - battery (for cars with air conditioning); 12 – the relay of the fuel pump of the engine; 13 - lamp control unit in the rear lights |
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The fuse and relay box is located at the rear of the engine compartment on the right or left side of the plenum box (depending on model). To replace the fuses, it is necessary to remove the block cover by unfastening the clips. The location of the fuses, the circuits they protect, as well as the rated current of the fuse are indicated on the inside of the unit cover.
The plastic housings of the fuses have a different color according to the rated current.
Part of the relay is located in the fuse box, and the other is in a separate additional relay box in the passenger compartment on the left side under the instrument panel. To check the health of the relay, turn on and turn off the corresponding system several times. If characteristic clicks are not heard at the same time, then the relay is faulty and must be replaced. The relay to be replaced is simply pulled out of the socket.
| The location of the relay in the mounting block | ||
| N relay | Name | Catalog number |
| I | 431 951 253 A | |
| II | Relay for turning on the fan of the cooling system | 431 951 253 D |
| III | Forced idle relay on a car: | 443 919 096 C (443 919 096 E)* |
| – with 5-cylinder engines with fuel injection | ||
| - with 5-cylinder carburetor engines with manual gearbox | 443 919 096 A | |
| - with 5-cylinder carburetor engines with automatic gearbox | 443 919 096 | |
| – with 4-cylinder carburetor engines with gear indicator and econometer | 811 919 096 A | |
| Relay for the indicator of the included gear and the econometer on the car: | ||
| – diesel | 171 919 092 A | |
| with turbocharged diesel | 171 919 092 C | |
| with 4-cylinder diesel or turbocharged diesel | 171 919 091* | |
| Headlight cleaner relay | 413 955 535 | |
| V | Relay for unloading contact "X" of the outdoor lighting switch | |
| VI | Relay for control and activation of the vacuum valve of the air conditioner | 431 951 253 D |
| VII | Horn relay | 431 951 253 A |
| VIII | Automatic transmission relay (on vehicles with a manual gearbox, a jumper is installed between terminals "36" and "38") | 431 951 253 A |
| IX | Windscreen wiper relay | |
| X | Relay for switching on the fuel electric pump: | |
| – relay for switching on the electric fuel pump on vehicles with 5-cylinder engines with a speed limiter | ||
| – Relay for switching on the fuel pump on vehicles with 4- or 5-cylinder engines without a speed limiter | ||
| The relay of inclusion of heating of the inlet pipeline ** | ||
| Heater enable relay*** | 171 911 261 C | |
| XI | Relay for switching on the electromagnetic clutch of the air conditioner **** | 431 951 253 A |
| * On US version | ||
| ** On vehicles with fuel injection engine | ||
| *** On vehicles with carbureted engines | ||
| **** On diesel vehicles |
| Relay box | ||
| N relay | Name | Catalog number |
| I | Brake pad wear indicator relay | 431 951 253 A |
| II | Seat heating relay | 431 951 253 A |
| III | impulse relay | 813 906 064 |
| Additional starting relay for the automatic vehicle activation system | 431 951 253 A | |
| IV | delay relay | 433 919 577 |
| Relay for turning on and off the heating of the rear window of the system for automatically bringing the car to working condition | 431 951 253 A | |
| V | Emergency oil pressure warning lamp relay on a car: | |
| – with 4-cylinder petrol engines | 433 919 082 | |
| – with 5-cylinder petrol engines | 433 919 082 | |
| - with 5-cylinder diesel engines | ||
| Relay of a control lamp of not fastened seat belts | 443 919 469 | |
| VI | The relay of inclusion of a sound signaling device of not fastened seat belts | 857 919 439 |
| Fog lamp relay | 431 951 253 F* | |
| Relay for turning on outdoor lighting when driving in the daytime | 431 951 253 D* | |
| Anti-theft relay signaling | 437 927 827 | |
| VII | Overvoltage relay | 437 927 825** |
| VIII | Time relay | 431 951 253 B |
| IX | Safety relay air conditioner | 431 951 253 B |
| X | 431 951 253 B | |
| XI | The relay of inclusion of the electric motor of the fan of the cooling system | 431 951 254 B*** |
| XI-XII | Electronic cooling fan motor control unit | 443 907 393 |
| XIII | Reserve | |
| XIV | Relay for switching on the rear window cleaner | 171 955 529 |
| XV | Injector cooling relay | 431 951 253 A |
| XVI | Relay for switching on the dipped headlights | 431 951 253 C* |
| Turn signal relay | 431 951 253 A**** | |
| Electronic control unit | 055 906 086 | |
| XVII | High Beam Relay | 431 951 253 A* |
| High power horn activation relay | 431 951 253 A | |
| Relay for enrichment of the combustible mixture | 431 951 253 C | |
| XVIII | Ignition relay | 431 951 253 A* |
| Oxygen A/C Sensor Relay | 431 951 253 A | |
| * Variant for Sweden | ||
| ** On vehicles with ABS | ||
| *** On vehicles with turbocharged diesel | ||
| **** By taxi |
