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post #11 of 13 (permalink) Old 05-15-2016, 02:56 PM
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Default Smart Key not working

Make sure you don't have any devices (esspecially a battery back) with an internal battery left plugged into Cig-Lighter port with or without USB adaptor when your Prius is off. Some devices will cause Smart Key failure, esspecially a Battery Bank (as in my case) because it supplies power.
Evidently when Smart Key system detects backfeed voltage from a battery powered device (in my situation a cheap solar/USB charged Battery Bank gizmo), the sensitive system goes bonkers and fails to lock doors when the outside lock buttons are pushed, and, as I recall, just emits a long-beep.
I definitively troubleshooted and proved this condition. I removed the suspect battery bank device and system went back to normal, reconnected it and failure reocurred. Took me several weeks to finally stumble on this simple but puzzling condition, my wife now thinks I'm a Prius genius NOT...LOL.

Hope this helps someone.
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post #12 of 13 (permalink) Old 05-15-2016, 03:14 PM
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A rechargeable Battery-Bank mobile accessory (possibly other internal battery devices) left plugged into Prius Cig-lighter port when car is off can cause Smart-Key failure due to possible voltage backfeed into Prius 12v system.
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post #13 of 13 (permalink) Old 10-16-2016, 09:07 PM
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Thank you for your posts about this problem. I have 2 smart keys for my 2013 Prius V and one stopped working. I replaced the battery and it still didn't work until I tried leaving the other key a distance away from the car, then it worked fine.
I wouldn't have thought to do that until I read the post about a key being lost inside of the car.

Thanks again.
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