Please help!! Sigma M30 alarm keeps going off when arming

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Hey everyone,

After changing the spark plugs on my 2001 WRX (UK GDA), I went to lock the car and noticed the soft alarm started going off — similar to the chirping sound you get when a door is left open. However, this time it doesn’t stop — it just keeps chirping continuously.

 

I initially thought it might be the bonnet switch, but before, if a door or the bonnet was open, it would only chirp a couple of times as a warning — not endlessly like this.

 

Anyone experienced this before? Wondering if I’ve accidentally disturbed something while working under the bonnet, or if it’s just a coincidence.

 

Any help would be appreciated!