![]() I'd love for any and all help, for if I can't solve it on my own, it'd be great to have as much information as possible to relay to the mechanic. Does this mean the parasitic draw test that I ran was meaningless? Well, in my case, the battery of my Prius was dead and the back hatch was open (since that's where the battery is located so how else are you supposed to access it?). ![]() Could that be affecting the "smart key system" and causing the parasitic drain? I was also just reading a different article that claims that in order to do a parasitic draw test with a multimeter, the car's battery should be fully charged, and all windows and doors should be shut. I responded by switching to the spare key fob, rather than replace the battery itself. For the months prior to this particular issue, I was getting messages from my Prius that the key fob battery was low. The fuse is that of ECU B, with a corresponding ampere of 7.5, and which is responsible for the "smart key system, personal lights, gauges and meters, emergency flashers"-as per the vehicle's manual.Ī couple more *possible* considerations. I then pull each fuse (in the fuse box under the hood) and find that there is one that, when pulled, drops the reading to -0.2A (seems like there still may be an additional drawing source but we'll have to worry about that another time). From there, I test for a parasitic draw using a multimeter which gives me a reading of approximately -2.0A. They suggested that if the problem persists then it is most likely a parasitic drain. I even returned to Pep Boys claiming the new battery they gave me might be no good, but they then ran the necessary tests on it showing me that it is in fact a perfectly good battery. Problem solved! Until the same exact problem persisted with the new battery. ![]() Voila! The battery was totally dead and needed to be replaced. So of course first thing I did was take it in to Pep Boys to have the battery evaluated. Once the keychain has been opened, you will be able to access the battery that is housed inside. Open the key fob by pressing the button labeled release. This button is typically situated in the lower right-hand corner of the fob. I responded by switching to the spare key fob, rather than replace the battery itself. To begin, look on the reverse side of the key fob for a button that says release. The result is the same: I try to turn the car on, to no avail, the battery is dead and needs to be jumped. For the months prior to this particular issue, I was getting messages from my Prius that the key fob battery was low. Though sometimes it is just one, single night. It could be a few days of non-use, or a week. The primary issue: the battery is draining over night. I'm going to try including all of the relevant context. Hello! My Prius battery has been having some trouble over the past couple months.
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