Fuses in engine compartment
Fuses in the engine compartment protect engine and brake functions, amongst other things.
On the inside of the cover there are tweezers that facilitate the procedure for the removal and fitting of fuses.
The fuse box also provides space for several spare fuses.
Positions
On the inside of the cover is a label that shows the location of the fuses.
- Fuses 18-30, 35-37, 46-54 and 55-70 are of the "Micro" type.
- Fuses 31-34, 38-45 and 71-78 are of the "MCase" type and should be replaced by a workshop2.
| Function | A3 | |
|---|---|---|
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | Heating of lambda probe*1; Control module for vehicle gas*1 | 15*1 |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | USB port in tunnel console, front* | 5 |
 | 12 V socket in tunnel console, front | 15 |
 | 12 V socket in tunnel console, by legroom for second seat row | 15 |
 | 12 V socket in cargo area* | 15 |
 | - | - |
 | Left-hand headlamp, certain variants of LED4 | 15 |
 | Right-hand headlamp, certain variants of LED4 | 15 |
 | - | - |
 | Heated windscreen* left-hand side | Shunt |
 | Heated windscreen* left-hand side | 40 |
 | Headlamp washers* | 25 |
 | Windscreen washers | 25 |
 | - | - |
 | Horn | 20 |
 | Siren* | 5 |
 | Control module for brake system (valves, parking brake) | 40 |
 | Windscreen wipers | 30 |
 | Rear window washer | 25 |
 | Heated windscreen* right-hand side | 40 |
 | Parking heater* | 20 |
 | Control unit for brake system (ABS pump) | 40 |
 | - | - |
 | Heated windscreen* right-hand side | Shunt |
 | Supplied when the ignition is switched on: Engine control module; Transmission components; Electric steering servo; Central electronic module; Control module for brake system | 5 |
 | - | - |
 | Right-hand headlamp | 7.5 |
| Right-hand headlamp, certain variants of LED4 | 15 | |
 | - | - |
 | - | - |
 | Module for controlling battery engagement | 5 |
 | Airbags | 5 |
 | Left-hand headlamp | 7.5 |
| Left-hand headlamp, certain variants of LED4 | 15 | |
 | Accelerator pedal sensor | 5 |
 | Transmission control module | 15 |
 | Engine Control Module (ECM) | 5 |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | Engine control module; Actuator; Throttle unit; EGR valve (diesel); Position sensor for turbo (diesel); Valve for turbocharger (petrol) | 20 |
 | Solenoids (petrol); Valve; Thermostat for engine cooling system (petrol); EGR cooling pump (diesel); Glow control module (diesel) | 10 |
 | Vacuum regulators; Valve; Valve for output pulse (diesel) | 7.5 |
 | Control module for spoiler roller cover; Control module for radiator roller cover; Relay coils for output pulse (diesel) | 5 |
 | - | - |
 | Lambda-sond, front; Lambda-sond, rear (petrol) | 15 |
 | Solenoid for engine oil pump; Solenoid clutch A/C; Lambda sond, centre (petrol); Lambda sond, rear (diesel) | 15 |
 | - | - |
 | Engine Control Module (ECM) | 20 |
 | Ignition coils (petrol); Spark plugs (petrol) | 15 |
 | Control module for vehicle gas*1 | 15*1 |
| Fuel filter heater (diesel) | 30 | |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | - | - |
 | Starter motor | Shunt |
 | Starter motor | 40 |