Peugeot 405 1994 Alarm Deactivation-Please Help

I have a 1994 Peugeot 405, I thought my alarm was deactivated but this
morning it just started making noise.. My key does not work and I have tried
to find the key deactivation under the bonnet. I also dis connected the two
wires underneath the drivers seat but I have electronic seat adjustments so
all that did was disconnect the seat and not the alarm. I found two wires in
the engine that I removed but now the car will not start. Could someone
please let me know how I can solve this problem.. Please Please Please...Help.
..

 

This is what you do on a 106 and this does work. Hopefully the
software on the 405 is of the same generation:

Sorted.


For future reference for others:


Close all doors.


Place key in ignition so radio comes on.
turn off ignition.


repeat 3 times.


then start up engine.


The hazards will flash really fast for a few seconds.


Alarm is now reset.


Hope this works