I think the alarm and immobiliser are standard on my truck (300tdi 1997) and when I bought the truck I soon found that due to the f***ed buttons on the fob, it would lock the disco up, arm the alarm but would not unlock on the button therefore, alarm goes off when you unlock on the key. So a quick fiddle with the buttons and I reversed it, so I lock on the key and unlock on the button. Sometimes when I go to turn the key the little car flashes up on the dash, but a quick push on the unlock button it goes out.

But, down to the reason I am writing this thread in the first place, a very simple question, if I hide an isolation/battery cut of switch, and cut the power, is it going to have an effect on the alarm and immobiliser????

P.s. it the buttons on the circuit boards which are no good, so just buying a fob case didn't work. And new ones are silly money.

Cheers

Cutting the battery supply will effect alarm and immobiliser, central locking, clock and radio unit if coded. Remote key do a fob refurb.

I don't mind cutting the supply, I got the radio code, I can lock the doors with the key, I just don't want to have the alarm going off as soon as I cut/reconnect the supply. Or have an immobilised disco that I can't do anything with. When I get in, and put the red key in, I want to be able to turn the ignition and go, that's what I'm saying.

If your battery backed up alarm sounder still functions then that will sound as soon as the supply is removed, but that's doubtful as mine which is a 97 packed up years ago, i can't be bothered to thake the sounder apart and replace the battery.

Reconnecting you vehicle battery supply will be-should be ok try it and and see, you normally have to re-sync the fob to the ecu after reconnecting the battery also.

So I will disconnect the battery and reconnect and see what happens, how do you re-sync the fobs??

Thanks for the help

Easy just press the lock button 4 times.