Q: The doors lock automatically, even when car is off and key is out of ignition. on 1999 Suzuki Grand Vitara

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I don't know what aftermarket security is. I thought that maby my remote button was stuck, but that does not seem to be the problem. I am wondering if a reset of the on board computer is the fix... ??? A short in the ciruitry somewhere... ??? Just wondering if someone out there already addressed a similar problem.
Is the remote 'suzuki' or unmarked or other brand? Are you the original owner? No owners manual , right?
Remote is "Autostart". I bought the car used in 2011. There is a owner's manual in the car, but no manual for the remote.
Maybe 'google' that brand , or check with local shop that does (specializes) those type of installs. Sounds like a programming problem.(or my other thought- wiring over time has become corroded and it's causing false signals to system).Good luck.