Start button on 2020 corolla malfunctuons…ticming noise behind dash…horn sounding off on its own, in traffic.slow starting like a battery problem…
your vehicle is still under warranty. bring it to the dealer.
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It amazes me how many people with new cars who don’t think to go to a dealer when they have a problem while the car is still under warranty. 
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I think its because they do not want to waste a day going their or they think they will be without a car for a few days and maybe they can fix it on their own. but they can always ask if they have a loaner car at the dealer.
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It also depends on how far one lives from the dealer.
Tester
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You could make sure the connections at the battery are clean and tight.
If you disconnect the battery you will probably need to reset the radio using a code that is somewhere in the printed material that came with the car - so you’ll want to know that code before you dive in. For my Honda I wrote that number on the file folder I keep for that car, and on a post-it that’s stuck inside the glove compartment. (I’m not worried someone will steal the radio from a 1999 Honda.)
I would not do a battery disconnect on a 2020 Toyota. Let the dealer handle it.
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Most times I’ve been to the dealer, they failed to recognize or properly repair the issue and it was a waste of time. Luckily all of my vehicles are out of warranty now anyway!
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+1
And, if they try to remedy their problem on their own, or by paying a mechanic to “fix” it, they could wind-up voiding their warranty.
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That has not been my experience for warranty work or just plain repair. Plus the vehicle is in a more secure spot rather than just setting out in the open .
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I’ve had this happen to me several times, and it’s really frustrating.
It would happen far less often if I could only speak with the mechanic beforehand. The liability-free description of the problem that the non-technical service writer enters on the repair order makes it difficult for many problems to be properly understood.
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I presume you mean “ticking” noise behind dash. That could be an hvac vent door problem. If it stops right away, could be normal, some sort of self-test. ABS self test can make a similar sound.
Horn sounding could be a problematic horn switch or horn relay, or an alarm system malfunction.
Explain more Wwhat do you mean by “in traffic slow starting”?
The standard battery/alternator test is to measure the battery voltage before first start of the day, should be about 12.6 volts. Then immediately after starting the engine, 13.5-15.5 volts.
This is not a post asking for help. It is one of those Carcomplaints things that end up here . The vehicle is under warranty - the battery has at least a 3 year warranty so no need to test it . The person just takes it to the dealer and hopes they can solve these problems.
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