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1999 Mini Immobiliser Problems

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#1 johnobr


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Posted 17 May 2020 - 03:07 PM

1999 Mini immobiliser problem


I recently had trouble starting my Mini. The battery was replaced at Christmas, however, it is infrequently used and wouldn't start again the other week when I went to turn it over. While attempting to jumpstart it I have somehow managed to immobilise it so am now at the point where when I attempt to jump start it, all I get is a constant horn noise, and the engine refusing to start. I have replaced the batteries in both my fobs and tried to reset, but to no avail. No red light is coming on at all on the dashboard when the key is inserted. As said, the battery is new and the car's probably only done about 50 miles with it. Have tried disconnecting and reconnecting the battery, but to no avail.

Any advice would be greatly appreciated 


#2 Fast Ivan

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Posted 17 May 2020 - 04:07 PM

When you say you’ve tried to reset the fob, what did you do?
There’s a method for this hat is quite specific

#3 MacGyver


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Posted 17 May 2020 - 04:24 PM

Can you turn the lights on?
Maybe a short on the battery mainline running under the car? Shorting out when you try to start it, there for resetti g the alarm each time.

#4 MikeRotherham


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Posted 17 May 2020 - 04:43 PM

If the immobiliser on the MPI (the later 5AS i think) is anything like mine, a 95 Mayfair( which is a 3AS) there is a constant drain on the battery. Only small but over a period of time it will flatten the battery. Could be what has happened to yours.

Edited by MikeRotherham, 17 May 2020 - 04:46 PM.

#5 viz139


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Posted 18 May 2020 - 10:12 AM

Every time you have a flat or replace the  battery you must re-sync the mobilizer and fob.  I think the sequence is press unlock 5 times than lock.

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