12 volt battery dead after 3 1/2 weeks

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bpratt

bpratt

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I left on vacation with the traction battery at 2/3 but when I returned, the 12 volt battery was dead so the car would not start. I put a 2 amp charger on the battery overnight and it was back up to 12 volts the next morning.
When I pushed the start button, I got several error messages and the screen ended with a message saying "Anti Theft System This system has lost power. Push and hold the power button for more than two seconds to enable the system." I tried pushing and holding the start button several times but the message would not go away and I can not display anything else on the screen.
Anyone have an idea how to reset this problem before I schedule a service appointment with my Honda dealer? One other note: the traction battery was still at 2/3 after charging the 12 volt battery.
 
Last edited:
I would have the dealer check out the 12 volt battery. It should not have last charge. Most of the error messages will reset after you drive the car a few days.
 
Called the dealer service department and was told the start button the message was referring to is the button on the screen that is marked audio. Once I held that button down for two seconds, the screen came back on and the error message disappeared.
 
Thanks for sharing your experiences with this problem. I will go out and pushing the audio button for 2 seconds. I tried the “Power” button just everyone else. I hope HONDA updates the written message to indicate they are referring to the audio power button. I guess I will have to investigate why this happened, maybe there is something wrong with my 12 V battery. Thanks again to everyone. Crossing my fingers the fix will work for me too.


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I went on vacation for 12 days and no issues. 70% charged, not charging, not plugged in, keys not in the car.

If the keys are in the car the car can be in a ready state which will eventually drain the 12 volt battery.
 
I took delivery on the car the day it arrived at the dealer in December 2017. Battery tests good and nothing was left on. The next time I go on a 3 or 4 week vacation, I will leave a 2 amp charger on the 12 volt battery.
 
My 12 volt battery totally discharged this weekend, but for completely different reasons. I had a 240 volt outlet installed and was charging on my dual-voltage EVSE for the first time on 240, and it was not happy for some reason (I assume it's due to the issue in service bulletin 18-097) - it would charge for about a minute, stop charging for a minute or two, then start charging again, and kept cycling on and off like this. While it eventually fully charged the high-voltage battery, apparently the 12 volt battery didn't like all that cycling for some reason. Once I hooked up my jump-start battery it started up fine, although a bunch of errors popped up that went away after I reset the anti-theft feature on the entertainment system.

I have an appointment Friday to try to get the 18-097 fix installed, along with any other service bulletins that might be outstanding.
 
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