Production of the Audi 100 C4 45 began at the end of 1990. This model was produced from 1991 to 1994. The model name was then changed to Audi A6, and production continued from 1995 to 1997. This material provides information on fuses and relays for the Audi 100 C4 and Audi A6 C4 from 1990 to 1997, including box diagrams and their locations.
The purpose of fuses and relays may differ from those presented and may vary depending on the level of equipment, model and market of the vehicle.
Contents
Locations
- Additional relay and fuse board No. 1;
- Fuse and relay box (Audi 100), fuse box (Audi A6);
- Connecting box No. 1;
- Central switchgear with relay box;
- Additional mounting box No. 2;
- Connecting box No. 2;
- Ignition system box;
- Additional mounting box No. 3;
- Connection box No. 3.
Changes in the schemes are possible depending on the equipment and the year of manufacture of your car. Be careful.
Additional box – No. 1
Located in the engine compartment. To access, remove the protective cover by sliding the latches.
For cars produced before 1994
Diagram
Designation
| No. | Function |
| 1 | Not used |
| 2 | Relay for seat belt control, parking light |
| 3 | Time delay relay for indoor lighting |
| 4 | Not used |
| 5 | Headlight relay |
| 6 | Not used |
| 7 | Relay for switching on the 3rd fan speed |
| 8 | ABS relay |
| 9 | Not used |
| 10 | Power window relay |
| 11 | Power window relay |
| 12 | Rear window washer and wiper relay |
| 13 | Not used |
| 14 | Power window overload relay |
| 15 | Driver’s seat heater relay |
| 16 | Passenger seat heater relay |
| 17 | Not used |
For cars produced from 1994
Diagram
Assignment
| No. | Function |
| 1 | Cooling fan control relay when the engine is not running |
| 2 | Engine cooling fan relay |
| 3 | Relay for switching on the 3rd fan speed |
| 4 | Fog lamp relay |
| 5 | Not used |
| 6 | Relay for intensive glass washer system |
| 7 | Daytime running light relay |
| 8 | Gear selector lamp relay |
| 9 | A / C clutch relay |
| 10 | Relay for turning on the air conditioner module |
| 11 | Rear window wiper and washer relay |
| 12 | Not used |
| 13 | Loudspeaker power relay |
| 14 | Lamp health control unit |
| 15 | Lamp health control unit |
| 16 | Servotronic power steering control unit |
| 17 | Air conditioner relay |
| Circuit breakers | |
| A1 | Automatic closing of windows |
| A2 | central locking |
| A3 | Window lifters |
| A4 | Radio |
| A5 | Seat heating |
| B1 | Seat adjustment memory |
| B2 | Electric seat |
| B3 | Heated door lock cylinders |
| B4 | Not used |
| B5 | SunRoof |
Main box – No. 2
For cars produced before 1994
Diagram
Decoding
| No. | Function | |
| 1 | 15 | Rear Fog Lamp Bulbs |
| 2 | 15 | Hazard warning system |
| 3 | 25 | Horn, brake light |
| 4 | 15 | Clock, cigarette lighter , climate control, interior and trunk lighting lamps, cruise control, radio tape recorder |
| 5 | – | Not used |
| 6 | 5 | Lamps for the right tail lamp, parking lamp and side marker lamp |
| 7 | 5 | Lamps of the left tail lamp, parking lamp and side marker lamp |
| 8 | 10 | Right headlight high beam lamp, headlight high beam indicator lamp |
| 9 | Left headlight high beam lamp | |
| 10 | 10 | Low beam lamp, right headlight |
| 11 | 10 | Low beam lamp, left headlight |
| 12 | 15 | Differential lock system, reversing lamp, cruise control, interior heating system |
| 13 | 15 | Fuel pump |
| 14 | 5 | Lamps for license plate, instrument cluster, ashtray, climate control panel, engine compartment and glove box |
| 15 | 25 | Wiper motor, turn signal lamps, air conditioning, heated windshield washer jets, engine cooling fan temperature sensor |
| 16 | 30 | Heated rear window, heated mirrors |
| 17 | 30 | Climate control system (fan) |
| 18 | 15 | Rear wiper |
| 19 | 10 | Central door locking system, anti-theft system, door lock heater |
| 20 | 30 | Seat heater |
| 21 | 10 | Diagnostic unit |
| 22 | – | Not used |
| 23 | 5 | License plate light |
| 24 | – | Not used |
| 25 | 30 | Driver’s seat adjustment motors, driver’s seat memory unit |
| 26 | 5 | Instrument cluster, power mirrors, automatic check system, cruise control unit (if installed) |
| 27 | 10 | Ignition control unit |
| 28 | 15 | Fuel injection control unit |
| 29 | 10 | Heated oxygen sensor |
| 30 | – | Not used |
| 31 | – | Back-up fuses |
| Relay | ||
| 1 | Not used | |
| 2 | Relay for switching on the 2nd fan speed | |
| 3 | Relay for switching on the 1st fan speed | |
| 4 | Not used | |
| 5 | Unloading relay | |
| 6 | Not used | |
| 7 | Horn relay | |
| 8 | Relay for control of automatic transmission and anti-theft system | |
| 9 | Not used | |
| 10 | Fuel pump relay | |
| 11 | Not used | |
For cars produced from 1994
The fuses are situated on the left side of the dashboard, beneath a cover that is distinguishable from the surrounding area.
Diagram
Protected components
- 10A – Right high beam headlamp and high beam warning lamp
- 10A – Left high beam headlamp
- 10A – Right dipped beam headlamp
- 10A – Left dipped beam headlamp
- 5A – Right side light
- 5A – Left side marker fire
- 15A – License plate, glove compartment, engine compartment, temperature control panel, ashtray and dashboard lamps
- 15A – Clock, map reading lamps, trunk lighting lamp, lighter, interior lighting lamps, visor lamps, on-board computer , rear-view mirrors adjusters, programmable seat adjusters
- 10A – Stop lights
- 15A – Warning lamp
- 30A – Heater fan, air conditioner
- 30A – Heated rear window and rear-view mirrors
- 25A – Windshield wipers, direction indicators, cooling fan, sprinkler heaters, gearbox oil temperature sensor
- 15A – Reversing lights, glass washers, cruise control, differential lock, multifunction sensor, speedometer sensor, water filter, automatic transmission
- 5A – Instrument panel, rear-view mirrors, on-board computer
- 15A – Fog lights
- 20A – Fuel pump, heating valve
- 15A – Rear window wiper
- 25A – Diagnostic system, sound signal, fan relay
- 5A – Cruise control system, automatic transmission
- 15A – ABS
Central switchgear – No. 4
Further only for cars Audi A6 C4 from 1994 to 1997 release
Designation
| No. | Function |
| 1 | Unloading relay |
| 2 | Horn relay |
| 3 | Relay for headlight washer system |
| 4 | Central locking relay Tail light relay (manual transmission) Automatic transmission relay (P / N) |
| 5 | Relay for interruption of the wiper and washer |
| 6 | Fuel pump relay |
Additional mounting box – No. 5
Diagram
Assignment
| No. | Function |
| 1 | Power window control unit |
| 2 | Power window control unit |
| 3 | Electric control unit for rear-view mirrors Automatic closing of windows |
| 4 | Electric control unit for rear-view mirror ABS combi |
| 5 | Shift Lock Control Module |
| 6 | Automatic transmission |
| 7 | Cooling fan fuse Electronic damping control module (fuse) |
| 8 | Cooling fan (fuse) |
Connecting box 3 – No. 9
Diagram
Description
| No. | Function |
| 1 | Not used |
| 2 | Airbag warning lamp relay |
| 3 | Not used |
| 4 | Not used |
| 5 | Auxiliary air pump relay |
| 6 | Not used |
| 7 | Not used |
| 8 | Exhaust manifold auxiliary air pump fuse |
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