I didn't know what the immobiliser was so I've had a look on the Net. I found this:
http://passionford.com/forum/cars-an...mobiliser.html
The problem is that it does not like like anything I have on my loom.
What is its purpose?
What is it connected to?
Where was it placed in the Sierra?
Perhaps the previous owner of the Siarra already bypassed it? Would it be possible?
Thank you.