ciaron69

Hi guys,
 
PROBLEM SOLVED! And to my embarrassment it was a fuse all along!
 
So I downloaded all of the technical information, documentation and data sheets for the Fabia II from erWin. This was actually very useful and provided me with the circuit diagrams and crucially the relay holder layout. It turns out I do have the correct headlights fitted. The single H7 halogen bulb functions as the dipped and main beam by means of a shutter on the headlight assembly. When the main beam is activated, a solenoid in the headlight moves the shutter and changes the light output of the headlight. This solenoid is actuated by a relay cct which is protected by a fuse. Fuse no. 36 (5A) is this fuse and it turns out it was blown! What is super annoying is that the car had previously (albeit briefly) been to a local garage for this problem who had informed me that all the fuses were good. Needless to say I won't be going there again for anything!
 
It is worth noting that in the documentation from Skoda, fuse 36 has two different functions depending on which type of headlight is fitted and I don't think it is particularly clear. It says "SB36 - Main Beam Headlight (H4)" then beneath this it says "Solenoid for dazzle adjustment of headlight (Bi - halogen H7)". If, like me, you are unfamiliar with projector headlights this translates as 'Main beam for an H7 bulb'. Anyway, lesson learnt!
 
If anyone is interested, the relay for this solenoid is in the left hand side of position 10 in the relay carrier. The cct diagram shows these two relays as 10.1 and 10.2. 10.2 is the "headlight dip relay". I guess it is entirely possible that a fault with this relay could have caused the blown fuse in the first place but I suspect that it's more likely that the incorrect H4 headlight that was fitted previously is to blame. Fuse 36 should be a 15A fuse when used with H4 bulbs so when there was one H4 and one H7 it was probably just drawing enough current to pop the fuse.
 
Anyway, thanks for everyone's help and input on this. Total spend was £6.10p and 98% of that was on documentation.
 
Ciaron