can a faulty bcu stop my td5 starting

I have a 1999 td5 that wont start after welding no indicators no electric windows no rear wiper m and s on dash and crossed B I disconnected the battery b4 welding the doors open and lock with key fob I dont have the eka code but if I use the key in the door lock it only opens and locks the drivers door... any help please I am thinking of sending my bcu off for a repair whats the going rate many thanks

If the bcu is locked out the car won't start as the car is immobilised.

Did you mean the fob doesn't unlock the car? As if the fob unlocks, it should diasarm the immobiliser too

Aye the fob works fine but still wont start

That's weird. Does the immobiliser LED flash even after it's unlocked?

The crossed B indicates a communication problem with the bcu. It's worth having a look at the IDM (fuse box) as its common for corrosion on the tracks to cause problems. It's cheaper and easier than the bcu so thats where I'd start to look.

Do you have access to Hawkeye or nanocom?

No I dont I have had a snap on fault code reader all clear I stripped the fuse box all clean and tidy (

http://www.landyzone.co.uk/lz/f8/wont-crank-s-m-d-flashing-beeping-261017.html
Have you read this from earlier this week seems you got the same prob so does sound like the bcu is your prob

Yer cheers fella new bcu it is I think

Think I will be unplugging all the brains as well as the battery if I ever need do any welding

Me 2 next time

How much do they charge for new BCU's now?

All sorted 2nd hand bcu 60 plus 80 to have it programmed started first go and everything works