My 2001 WRX Wagon has standard alarm and in last few days it has started going off for no reason.
When it does I can start car and indicators do not flash so i think it maybe some sort of battery back up problem in siren. Where is siren located (can't see it engine bay like my old classic) Can i over ride it? How can I fix it? Need help before neighbours torch it.
thanks

 

does exactly the same as mine but has not done it for a while ive found that if you turn your ignition off slowly it dosnt do it if you just turn the car off quickly jump out then the problem starts its worked for me anyway give it a go

 

mine had the same problem, even if i got going without it going off it would start blazing away 5min later while i was driving. I took in to the auto elecs they changed the sigma control box and the back up siren seems to have done the trick.

sigma control unit part no: sacc3465
backup siren part no: sigsn300

the alarm will need re-coding

 

Thanks guys - found siren and it looks in good nick - dry as a bone where its mounted but I didn't split it apart so it could be full of rusty bad connections as I'm sure it will have picked up some moisture over the years.
When I was holding siren, you could just make out a really quite little electrical groaning or buzz coming from it so there must be still power going to it.
Alarm is now totally dead -can't make it go off. However, imobaliser and central locking seems fine.
Will try Auto Electrician over the weekend.

 

I recently swapped my siren as it had died, cost around £60 IIRC.

HTH

dunx