Hey folks,
Drove my 2020 RX 450h today and came back to it a few hours later and it wouldn't start. When I pushed the power button all the lights in the dash start flashing and it shows a parade of error messages across the message area. It also wouldn't turn off when pushing the power button - had to push it about 5 times. Rear tailgate wouldn't open. And when I put one window down I could barely get it to go back up. Is this a battery issue? It sort of seems like it but I don't know why it would be flashing every single dash error light and flowing all the error messages. Thoughts? Thanks!

Sounds like the battery is going out.

Internal battery short circuit or bad connections to battery power somewhere.

If you have a charger to start, then try that. If it does start, then just replace the battery, and don't bother testing the battery, I have 12 volt AGMs in my walk along golf carts, and when they just start acting up I just replace them unless they are still under warranty, because even though they may test OK, they are still bad, Some AGMs can go forever and others seem to have a half life, My wife's RAV H is a 2016 and has the original battery, while other people have to replace theirs in half the time Go figure.

turns out it was the battery - we jumped it and it started and ran fine. why lexus would design a car such that instead of a battery error message the car literally goes bananas is beyond me. poor engineering.

Hey eggers, that is a great point. I don't think it would be that difficult for the engineers to come up with a warning or error message that points directly to a failed battery.

Just like I said, AGMs can test OK, but they are not. Still go figure

glad it was an easy fix.
say did you get the hatch open, or is there a jump post under the hood ??

The jump post is under the hood, and a pain to get to

Remember when they had "Keyboard not detected, press any key to proceed"

Salim