I now realise this was a bit of a silly question. I got out my 155 Manual. Never looked at it in the past 4 years. Its a real wealth of information.
Its got all the realays labled in there. Realise now that some of the relays and the fuses are under the bonnet too.
I thought I knew quite a lot about the 155, but Id always been woried about the imobilizer system. If I ever got a flat battery and needed to reprogram the keys or if I ever had an electrical problem. Still got that plastic card with the magic codes on. Never realised what it was for. Theres a lot of good info in there.
Fuses and relays differ between models but the main board is the same on them all except 2.0 16v. There man be a second fuse box hidden beside the first and 2 others under the bonnet.
The RED relay is for wipers.
On left side the relays are as follows:
Heated rear window timer.
POwer excluder on engine start.
Its too much to right any more. 2.0 16v is similar but some extra relays.
Anyway its all in the book.