In this article we focus on the first generation Audi TT (8N), produced from 1998 to 2006. Here you will find the Audi TT 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 and 2006 fuse box outline, information on the location of the fuse boxes in the car and the allocation of each fuse (fuse layout) and relay.
Instrument Panel Fuse Box
Fuse Box Location
The fuses are behind a cover on the driver’s side.
Two relay panels are located in the instrument panel.
Fuse Box Diagram
Assignment of the fuses in the instrument panel
| № | Amps | Function/component |
|---|---|---|
| 1 | 10A | Heated exterior mirror, driver’s side Heated exterior mirror, front passenger’s side Heater element, left washer jet Heater element, right washer jet |
| 2 | 10A | Hazard warning light switch |
| 3 | 5A | Glove box light Fog light relay Ar conditioning system/Climatronic operating and display unit |
| 4 | 5A | Number plate light, left Number plate light, right |
| 5 | 7.5 A | Fresh air/air recirculating flap switch Continued coolant circulation relay Bulb monitoring device, front Brake pedal switch |
| 6 | 5A | Central locking control unit |
| 7 | 10A | Diagnosis connection Reversing light switch Hazard warning light switch Speedometer sender |
| 8 | 5A | Mobile telephone operating electronics control unit |
| 9 | 5A | ABS control unit |
| 10 | 10A/15A | 1998-2001: Motronic control unit Motronic current supply relay; 2002-2006: S contact Central locking control unit Control unit in dash panel insert |
| 11 | 5A | Control unit in dash panel insert Oil level and oil temperature sender |
| 12 | 7.5A | Diagnosis connection Mobile telephone operating electronics control unit Aerial amplifier for mobile telephone |
| 13 | 10A | Brake light switch |
| 14 | 10A | Central locking control unit Door warning lamp, left Door warning lamp, right Interior monitor deactivation switch Interior locking switch, driver’s side Rear lid remote release switch |
| 15 | 5A | Control unit in dash panel insert Automatic gearbox control unit |
| 16 | 10A | Radiator fan control unit |
| 17 | – | Not used |
| 18 | 10A | Main beam bulb, right Fog light relay Control unit in dash panel insert |
| 19 | 10A | Main beam bulb, left |
| 20 | 15A | Headlight range control motor, right Headlight range control regulator Headlight range control motor, left Bulb monitoring device, front |
| 21 | 15A | Bulb monitoring device, front |
| 22 | 5A | Bulb monitoring device, front Side light bulb, right Control unit in dash panel insert |
| 23 | 5A | Bulb monitoring device, front Side light bulb, left Control unit in dash panel insert |
| 24 | 20A | Automatic intermittent wash and wipe relay Intermittent wiper switch |
| 25 | 25A | Ar conditioning system/Climatronic operating and display unit Heated rear window relay Fresh air blower Fresh air blower control unit |
| 26 | 25A | Heated rear window switch |
| 27 | 30A | Cabrio windbreak control unit Cabrio windbreak switch |
| 28 | 20A | Fuel system pressurisation pump |
| 29 | 15A | Motronic control unit |
| 30 | – | Not used |
| 31 | 5A/20A | Four-wheel drive control unit Automatic gearbox control unit |
| 32 | 10A | Injectors |
| 33 | 20A/30A | Automatic intermittent wash and wipe relay |
| 34 | 10A | Charge pressure control solenoid valve Inlet camshaft control valve 1 Turbocharger air recirculation valve |
| 35 | – | Not used |
| 36 | 15A | Front and rear fog light switch |
| 37 | 10A/20A | 1998-2001 (10A): S contact Central locking control unit Control unit in dash panel insert; 2002-2006 (20A): Motronic control unit Motronic current supply relay |
| 38 | 15A | Central locking control unit Anti-theft alarm system horn |
| 39 | 15A | Hazard warning light switch |
| 40 | 20A | Dual tone horn relay |
| 41 | 15A | Cigarette lighter |
| 42 | 20A | Radio Amplifier |
| 43 | 10A/15A | Activated charcoal filter system solenoid valve 1 Secondary air inlet valve Secondary air pump relay Air mass meter Exhaust gas temperature sender 1 |
| 44 | 15A | Heated driver’s seat regulator Heated front passenger’s seat regulator |
Relays
| № | Equipment |
|---|---|
| 1 | Not used |
| 2 | Bulb monitoring device, front |
| 3 | Bulb monitoring device, front |
| 4 | Fog light relay |
| 5 | Starter inhibitor relay |
| 6 | Not used |
| 7 | Brake light suppression relay / Not used (from model year 2003) |
| 8 | Not used |
| 9 | Not used |
| 10 | Heated rear window relay |
| 11 | Starter inhibitor relay |
| 12 | Cabrio windbreak control unit |
| 13 | Continued coolant circulation relay / Reversing light relay |
| 14 | Not used |
| 15 | Not used |
| 16 | Not used |
| 17 | Not used |
| 18 | Differential lock fuse (Haldex coupling) (up to model year 1999) / Not used (from model year 2000) |
| № | Equipment |
|---|---|
| 1 | Dual tone horn relay |
| 2 | X contact relief relay |
| 3 | Not used |
| 4 | Fuel pump relay |
| 5 | Automatic intermittent wash and wipe relay |
| 6 | Automatic intermittent wash and wipe relay |
| A | Convertible roof actuation fuse |
| B | Hydraulic pump relay fuse |
| C | Electric window thermo-fuse |
Engine Compartment Fuse Boxes
Fuse Box №1
It is located on the left, on bulkhead.
| № | Equipment |
|---|---|
| 1 | Secondary air pump relay |
| 2 | Motronic current supply relay |
| 3 | Hydraulic pump relay fuse |
| 4 | Secondary air pump fuse |
| 5 | Not used |
| 6 | Not used |
| 7 | Automatic gearbox control unit fuse |
| 8 | Not used |
| 9 | Not used |
Fuse Box №2
The main fuse box is located on the battery.
| № | Equipment |
|---|---|
| S131 | Secondary air injection pump |
| S132 | Engine management |
| S133 | Cooling fan 2 |
| S134 | Interior |
| S138 | Alternator |
| S162 | ABS pump |
| S163 | ABS valves |
| S164 | Cooling fan |
