I'm in the middle of changing all my dash lights over to red and brought a flashing red led as theres one on my dash already that I've never seen work. Thought it was an easy swap but when I pulled the blank out and followed the wires down they led to this little black box. It says 998 VAG 040.
I presumded the old led was something to do with an alarm but it didn't work and I've never heard or managed to set any alarm off. But I dont want to tempt fate, start fiddaling around n set something off that I really shouldn't! So I was just wondering if anyone could tell me what this is, if it is safe to just replace the led or how can I make the whole thing work?
Oh and while I was taking the dash out under the steering wheel I found an immobiliser switch...is this standard or has someone put it in? (wiring doesn't look too pro)

