corrado_968 0 Posted January 27, 2005 having problems with a VW fitted 900/901 series alarm/immobiliser (1992), small square black keyfob with blue volkswagen script on top this may be a bit complicated but worth a shot before i call out an electrician the car has been sitting for a while (battery 6 months old and fully charged) and when i reconnect the battery the alarm is activated immediately (LED on, wasnt the case before), using the setup sequence given in the manual (ignition on, reconnect battery (i get a loud relay type click from the dizzy cap area on doing this), ignition off, press keyfob for 10 seconds) this doesnt work and the LED is still on (it used to before) however using this sequence the alarm/LED is off when you first reconnect, when trying to start you hear the starter motor turn but nothing catches, the moment the ignition is back in the off postion the alarm light is back on and cant be switched off, it actually started once after MANY tries using this setup procedure but i have been unable to replicate it, on that occasion i heard the fuel pump (or ABS?) spin up for 1/2 seconds as it usually does, and the engine started right away basically theres a relay or switch (the click i usually hear when i reconnect the battery and the ignition is on) thats cutting the fuelling or some such, but its odd how it worked once and not again im going to try a new battery for the keyfob (currently using the spare that ive never used before but is 10 yrs old) but is there also a way of resetting the alarm/immobilizer manually? thanks for listening :) Quote Share this post Link to post Share on other sites
Henny 0 Posted January 28, 2005 After reading that, My first thought was to wonder if you've got a dead ignition switch... :| There's a "How To" guide on how to fit it on this site in the knowledge base, and for the £20 and 3/4 of an hour it'll cost you, at least it'll eliminate a known weak point from your possible list of causes... Quote Share this post Link to post Share on other sites
h100vw 0 Posted January 28, 2005 Most alarms arm themselves when you first re-apply power. If you have ever heard it run since I'd say the immobiliser is ok. Also you say the starter turns but the engine doesn't fire, another indication the immobiliser is ok, IMO. You can just slave in the swiyth to eliminate it quickly. Use a screwdriver to turn it. Your click near the dissy could be the ISV?? Maybe your fuel pump relay is duff? I have seen that a couple of times. They get dry joints in them and fail intermittently. I think you should only need to do the setup once. I would even try just disconnecting the battery and re-connecting it with the ign off. Gavin Quote Share this post Link to post Share on other sites
corrado_968 0 Posted January 28, 2005 tried connecting with the ignition off several times, alarm is just on straight away not sure what you mean by "just slave in the swiyth? to eliminate it" theres a box mounted in front of the coolant reservoir that has numbers and "12v" on it, it has 2 plugs going into the bottom and a clear flip up lid on the top side with 2 screws underneath, what does this do? :) Quote Share this post Link to post Share on other sites
Supercharged 2 Posted January 28, 2005 theres a box mounted in front of the coolant reservoir that has numbers and "12v" on it, it has 2 plugs going into the bottom and a clear flip up lid on the top side with 2 screws underneath, what does this do? Thats the fan run-on relays Quote Share this post Link to post Share on other sites
