This is basically why I am concerned: I found that if you go to lock/unlock your car with a Toyota/Scion smart key while someone within range of your car holds the lock/unlock button on their Toyota/Scion smart key, your car will not respond to your own key. Their signal basically just interferes with your signal causing the car to do nothing. If you walk away w/O noticing, your car will be completely defenseless. No lock. No alarm. In my test, I held my key button about 60 feet away from my dads car and it interfered with his key causing his car not to lock. This also worked vice-versa. This means thieves have the ability to stake out a parking lot, for example, and, just by holding a button on their key, will be able to gain access to the cars of unsuspecting civilians. This is a flaw that should be addressed.

- Aliso Viejo, CA, USA