Information Audi A2 Fuse , relay diagram

IMG_3534.JPGfuse diagram .png IMG_3538.jpg

Fuse:

1 - Control unit with display in dash panel insert 10A
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2 - Voltage Stabiliser 20A
Radio
Amplifier
Aerial Selection Control Unit
Operating Electronics Control Unit, Navigation
Navigation Interface
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3 - Voltage Stabiliser 20A
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4 - Radiator Fan Thermo-switch 25A
Radiator Fan
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5 -
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6 - Windscreen Washer Pump Switch 25A
Automatic Intermittent Wash/Wipe Relay
Intermittent Wiper Switch
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7 - Hazard Warning Light Relay 15A
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8 - Dual Tone Horn Relay 25A
Sliding Sunroof Adjustment Control Unit
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9 -
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10 -
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11 -
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12 - Cigarette Lighter 15A
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13 - Heated Drivers Seat Regulator 15A
- Heated Front Passengers Seat Regulator
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14 - Additional Heating Heater Element 20A
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15 - Heated Rear Window Relay 30A
Control and Display Unit for Air Conditioner/Climat
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16 - Fresh Air Blower Switch 30A
Fresh Air Blower Control Unit
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17 -
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18 - Fuel Pump (Pre-supply Pump) 20A
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19 - Activated Charcoal Filter System Solenoid Valve 1 20A
Lambda Probe Heater
Lambda Probe 1 Heater, Downstream of Catalytic
Converter
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20 - 4LV (injection system) Control Unit 20A
Ignition Coil 2
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21 -
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22 - Twin Filament Bulb for Headlight, Left 10A
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23 - Bulb Monitoring Device 15A
Twin Filament bulb for Headlight ,Right
Headlight Range Control Unit Motor, Right
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24 - Bulb Monitoring Device 15A
Twin Filament Bulb for Headlight, Left
Headlight Range Control Motor, Left
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25 - Telephone/Telematics Control Unit 5A
18-Pin Connector, Black Mobile Phone Interface
in Front Passenger's Footwell
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26 - Bulb Monitoring Device 5A
Tail Light Bulb, Right
Side Light Bulb, Right
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27 - Bulb Monitoring Device 5A
Tail light Bulb, Left
Side Light Bulb, Left
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28 - Diagnostic Connector 10A
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29 - Reversing Light Switch 15A
Diagnostic Connector
Automatic Anti-Dazzle Interior Mirror
Navigation System with CD Drive Control Unit
Parking Aid Control Unit
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30 - Bulb Monitoring Device 10A
Brake Light Switch
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31 - Cruise Control System Switch 10A
Brake Light Switch
Clutch Pedal Switch
Heater Element (Crankcase breather)
Exhaust Gas Recirculation Valve
Low Heat Output Relay
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32 - Glove Box Light 10A
Number Plate Light
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33 - Heater Element, Left Washer Jet 5A
Heater Element, Right Washer Jet
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34 - Hazard Warning Light Relay 10A
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35 - Front & Rear Fog Light Switch 10A
Lighting Switch
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36 - Heated Rear Window Relay 10A
Convenience System Control Unit
Control & Display unit for Air Conditioner/Climat
Tank Filler Flap Release Switch
Additional Heating Button (ECON)
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37 - Navigation System with CD Drive Control Unit 10A
Parking Aid Control Unit
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38 - High Pressure Sender 10A
Control & Display unit for Air Conditioner/Climat
Compressor Regulating Valve, Air Conditioning system
Navigation System with CD Drive Control Unit
Operating Electronics Control Unit, Navigation
Radio
Amplifier
Hazard Warning Light Switch
Speedometer Sender (Hall Sender, on Gearbox)
Oil Level/Oil Temperature Sender
Power Steering Control Unit
Telephone/Telematics Control Unit
Heated Rear Window Relay
Ignition Key Withdrawal Lock Control Unit
Parking Aid Control Unit
Automatic Anti-Dazzle Interior Mirror
Heated Drivers Seat Regulator
Heated Front Passengers Seat Regulator
18-Pin Connector, Black, Mobile Phone Interface
Passenger Footwell
Electronic Manual Gearbox Control Unit
Ignition Key Withdrawal Lock Control Unit
Selector Lever Lock Solenoid
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39 - Door Control Unit, Front Passengers Side 10A
Door Control Unit, Rear Right
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41 - Door Control Unit, Drivers Side 10A
Door Control Unit, Rear Left
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42 - Convenience System Central Control Unit 10A
Anti-theft Alarm Ultra-sonic Sensor
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43 - Electronic Manual Gearbox Control Unit 10A
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44 - Ignition Key Withdrawal Lock Control Unit 10A
Ignition Key Withdrawal Lock Solenoid Valve
Electronic Manual Gearbox Control Unit
Handbrake Warning Lamp Control Unit
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45 - Injectors for Cylinders 1-4 15A
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Last edited:

nod

Member
Hi folks I'm trying to find out why my radiator fan isn't kicking in. It doesn't work when aircon set to auto or when temp shows 90 in gauge, i was wondering if its the fuse, the diagram above and in my car shows there should be a 20a fuse at position 4, but there is no fuse in positions 3 or 4 in my car FSI, and no electrical contacts in those positions either?? also where do i find the fan fuse s142, marked c in the second photo above? how do i access it? the fan starts up fine if i disconnect the temp sensor in the bottom hose. i'm pretty clueless when it comes to car electrics, so I'd appreciate basic answers if you've any ideas. many thanks
 

audifan

A2OC Donor
Make sure you are looking at position 4. All diagrams are for LHD vehicles and RHD are rotated. S142 is on the fuse box but not visible through the cover. You need to drop the " drivers storage compartment " the panel below the steering wheel, it is held on with a couple of Torx screws ( one hidden above the kick panel to the right of the accelerator pedal ) and spring clips along its upper edge. Be careful when you lower it as theOBDII socket and service flap release are attached to it. You can now see the whole of the fuse box. Could it be the fault is the temp sensor in the bottom hose. The fan should run at low speed with the air con on - not ECON - all the time then speed up as the engine reaches over temperature. Check fuses with a meter do not just look at them as frequently they have failed but still look intact.
 

nod

Member
oh! so, if it is marked number 4 on the diagram, that is only for LHD. in our cars, number 4 is on the left hand side of the panel, and its not numbered 4? i'll go take a look. cheers
 

audifan

A2OC Donor
Circled fuse on YOUR (audia2owners ) picture is fuse 4. Most diagrams you look at are for LHD i.e the middle picture above ,the chart in the lid of the box ( right picture ) is correct. Picture not upside down as you can see the fuse box lid catches at the bottom as you look at it.
 
Last edited:

nod

Member
hi ok thanks, i've been out to check and the fuses are as laid out in the photos above (they are not my photos, or of my car). there are a couple of exceptions which i don't understand though. my car doesn't have any fuse for the radiator fan at position 4. i'll load a photo now
 

nod

Member
48009
position 4, no contacts? I did check the other fuses using a meter and found one was dead, but looked fine to the eye, good tip. cheers
 

audifan

A2OC Donor
What model and year is your car as there may be wiring differences. Worth reading this thread may be of help may not.
Do you have air con or the three rotary dials for the heater?
 

nod

Member
is a 2003 fsi with push button aircon, i tried it set to auto. i read that the fan won't come on if the aircon isn't sufficiently charged and I don't know if its charged, so that isn't conclusive. i'll try a new coolant sensor, but its starnge that there is no other listing for rad fan of the fuse box panel. mine just shows no. 4 radiator fan. I'll update once I've changed the sensor. thanks for your help
 

audifan

A2OC Donor
All fans run slow where air con is fitted. did you check the other thread? Worth checking the connections are good on the rear of the climate panel. Remove and refit all of the a few times, this wipes the contacts and while it is out clean out the little fan compartment making sure the fan is free to rotate. A diagnostic scan would now prove useful as it could show faulty components.
 
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