I have an issue with my car not starting after sitting idle for about 3-4 days. There are times over weekends of not using the car, when I go to drive it, it won’t start. Seriously! This started happening last spring. I have watched videos about it. One guy tested every single fuse in the vehicle and found out the radio was drawing power even with the vehicle off. His fix was to put in a new radio. But really? Why have to put in a brand new radio in a Brand New vehicle? My issue is still unresolved as I don’t have the wherewithall to check every single fuse.
This is normal. Modern radios needs to be partially powered all the time in order to retain the station information the driver has stored in its memory. That would normally be less than 50 mA. You might ask your shop tech how much current your radio was using .
It’s possible the radio was faulty from the get-go, but Toyota’s pre-shipping test didn’t discover it. It’s also possible there’s nothing wrong w/the radio; the fault is in the wiring harness. Finally, it’s possible the radio was good, the wiring harness was good, and the tech misinterpreted the radio power test results. (Fyi, my older Corolla’s radio draws about 3-5 mA in the “off” state.)
Have you checked your battery, 3-4 years old, could be bad…
Sorry to say but a 2021 is not a brand new vehicle, it is 3-4 years old…
If you have NO test equipment, then after driving the vehicle for a while, once home and key off, turn your heads lights on for about 15-20 minutes, then try to start the vehicle, if it doesn’t start then your battery probably requires replacing, if it does start normally then you will either have to find someone that can do a proper current draw, or simple remove your infotainment system (radio) fuse when the vehicle will not be driven for a few days to see if it is on that circuit or not…
Here are some good videos to watch…
BTW, your infotainment system is light years away from Georges 30 year old radio…
I have replaced 2 aftermarket radios in one of my vehicles because they started drawing 0.2 amps, or 200 mA, or more after only 3 years.
All cars draw some current from the battery when off. All the electronics draw a tiny bit. When one of those devices has a minor internal failure that draw can get annoying large and drain the battery.
Question, is it still under the bumper to bumper warranty?
If so, have the dealership diagnose it.
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I second the motion.