Try this it may work put key in ignition and turn to number 2 ( lights on dash) press the fob button on the key. doors should lock, then turn back off to 0, then press the fob button again the doors should open then try to start engine. if all works again but the alarm keeps going off randomly, the power sounder battery may be flat, it can be charged when the system is working again. but sometimes it can get damaged. and it may need to be changed. as I dont know what the sound is coming from under you hood Im thinking it could be this.
SOURCE: Alarm haywire, can't override anti-theft system or turn on car
The Alarm on my Mercedes ML320 sounded every night, then it started doing it more often, Showed it to the dealer he says it's the 'Tow Sensor', that needs to be repaced. $700, down the drain. I have already started hating this car, it eats $500-600, every 6 months...
SOURCE: Locked 2001 Camry, remote wont work, doors locked, no other key
Normally you can open the back seat from inside the truck. Look for a rear seat release somewhere.
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