Starting problems :(

[Turboman-a3]

My audi a3 has been playing up it was fine then all of a sudden it won't start and the instruments won't work it started running for a second then just stopped and now it doesn't start at all.
Do u guys think it's imobiliser related? No imobiliser light comes on? The ignition switch broke a few weeks ago but hs ran ok but i changed it when it wouldnt start but to no avail Any help would be great cheers guys

 

[beachbuggy]

check fuses 11 and 15 these are the instrument and Immob fuses.

 

[s3dave]

Sounds immob related

 

[Turboman-a3]

It comes up with these. Codes apon my own diag unit
18010

P1602

Power Supply (B+) Terminal 30 Low Voltage

And 17978 immob blocking engine ?
And

 

[s3dave]

The first one could be old, you get this when a battery is disconnected or failed have you tried clearing the fault?