first check the alarm is working, break into your 2

lol dont smash a window or anything put a window down, set the alarm and wait 30 seconds then open the door from the inside.

If it goes off your alarm is fine so maybe just the led?
TBH the toyota alarm system is crap and its worth investing in a decent alarm for peace of mind and also a insurance discount

(although I was offered a

£1 discount when I fitted a clifford 650 costing me

£450, maybe it will pay off if the car lasts another 451 years

)