by Frag » Tue May 15, 2018 11:26 pm
If the pats receiver was faulty,the immobiliser LED will flash rapidly when you turn ignition on,then if left will eventually flash a 2 digit fault code.
If,when you turn ignition on,the led comes on for a couple of seconds and goes out,the fault is not pats / immob. Related.
Could possibly be poor connections at battery lead ends,or poor main earth to engine,they break down internally but look ok.Substituting lead with a jump lead when is 'faulting' will tell you.