Here is the alram system off my Celica. It decided to stop working properly after I changed my cambelt.

Parts:

2-part ECU (one is imobiliser relays)
2 fully working keyfobs
2 working ultrasonic sensor
siren

Fault:

Not entirely sure what was wrong with it but it stopped locking the doors, the indicators didn't flash, the siren would not go off no matter what I did to the car.

What did work:

Everything else appeared to work correctly. Both fobs armed and disarmed the system including the imobiliser. The siren chirped as it should either 2 or 3 times depending where the fob switch was. LED on ultrasonic worked as it should. Alarm status LED worked as it should.

If all or some of the system may be useful to you or you have any questions then please contact me. I don't expect alot for any of it. I understand that the fobs may be quite important as working ones are rare. I think they can be reprogrammed too.

Cheers,

Ben