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Your Toyota Guy
Your Toyota Guy, Certified Toyota Master Diagnostic Technician
Category: Toyota
Satisfied Customers: 589
Experience:  I have been/am a Toyota technician for 15yrs+.
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This issue is like the one I'm experiencing. Same model,

Customer Question

This issue is like the one I'm experiencing. Same model, same year. Avalon 2006. Multimeter on the battery shows 12+ volts. Pushing the start button causes everything electrical to flash like disco lights seemingly randomly. When I press the brake pedal during the disco show, it sometimes stops the show...seems like a short somewhere.
Submitted: 1 year ago.
Category: Toyota
Expert:  Your Toyota Guy replied 1 year ago.

Your battery is dead and the car will have to be jumpstarted to make the engine run and the battery replaced to fix the problem for good. The meter is simply showing the value of what is called a "surface charge" as soon as any real demand is put on the battery the voltage is dropping too low to start the car.