Trying my push button start with my foot firmly pressuing down the break, I was surprised to hear a very loud, rapid clicking and no engine turning over. Gave it a few tries, let it rest, then tried jumping it with a Micro-start XP3 jump starter fully charged. Getting a jump the engine started turning over and the clicking didn't begin as rapidly, but it was barely any improvement and back to clicking. Charged the jump starter for a bit more and tried again and it was a little better but still barely turning over, and the jump starter is fully charged.

I could try jump starting with another car. Any harm in just trying to jump it more? I'm wondering what else could be the issue? I've seen online it could be the starter or relay. For such a new vehicle I'm surprised this came up. What is that loud rapid clicking sound, is it likely the starter arcing as it tries to get its motor going or begin combustion?

Other electronics are working: basic electric startup, and full accessory mode, with fans and lights all operating as usual as far as I can tell. I'm pretty certain it wouldn't have drained overnight, as it ran fine yesterday and I'd made sure to turn off lights and lock it.

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    If still under warranty, call up Toyota and have them fix it. If you mess with stuff, you could be voiding your warranty. – Pᴀᴜʟsᴛᴇʀ2 Sep 1 '18 at 19:31

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