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Comments
It's been back to the dealership at least 6 times for a week or more sometimes. Honda technical are as good as useless. So far it was definitely the battery (replaced twice) alternator (replaced) then the smart charging (replaced) then the ECU (replaced). Still the problem intermittently persists. Despite this issue being present within the warranty Honda are now refusing to pick up the cost.
Suffice to say this is my first and last Honda
Until you can figure out your cause, this car jumper is a life saver. It allows you to jump your car from a batter pack alone, no need for another car to be around. I used it 3 times successfully before finally figuring out and resolving my issue. It’s $39 at Walmart.
Believe it or not, the seat heater switch was the cause of all this trouble for me. Apparently I flipped it on while vacuuming out my car, which makes sense because my battery drain issue started 30 minutes after washing my car. I turned the seat heater switch off, unplugged and plugged back in the relay (under hood fuse box) that I *think* controls the heater switch (it had a picture on it that resembled the picture on my seat heater switch), and I haven’t had a problem since. It seems that in these electronics heavy cars, even when the car is turned completely off, accessories left in the ‘ON’ position still drain power from the battery. Either that or they start drawing from the battery immediately upon turning the car on, not leaving enough power for the battery to actually start the car. So I think the moral of the story here is, turn everything OFF before turning your car off, every time!
If you don’t have any switches left on, the problem for some people seems to be the AC relay (see 1st video above). This is only a $15 part that can be replaced easily yourself... just pull the old relay out and plug the new one in like you do with a blown fuse. From my research it sounds like the old relay manufactured by Omron is the one that fails often, but the newer relay manufactured by Mitsuba works fine. My 2016 CRV already has the updated Mitsuba relay so hopefully I won't ever have an issue with this. I did unplug/plug it back in on my car just to cover all my bases though. Hope this helps!
https://www.amazon.com/gp/product/B00BFDH05Y/ref=ppx_yo_dt_b_asin_title_o02__o00_s00?ie=UTF8&psc=1