The "Theft Deterrent System" ("TDS") alarm on my 2001 rav4 will go off for no reason.. And it's usually about 5 AM. It went off 3 mornings in a row. I'm sure no one is setting it off because one of those mornings I was at a relatives house and it alarmed there too. My neighbors are starting to get pissed. Is it something I can fix? Does it need to be replaced? If so, what is the best option of replacement and what will the costs be?