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2010 Toyota Highlander - Key trouble

My keyless button toyota HIghlander does not start and it showed key not available on the screen. Then i changed the key fob battery and then tried it again , this time what appeared on the screen again is DAC not available and still won’t start. Please i need an assistance to get this car runing again. Thanks in anticipation.

In case we don’t solve this quickly - phone your dealer. They may be able to help by phone.

What happens if you try the procedures on pages 545 and 542 of your owner’s manual?

Thanks for your candid advice. I will check pages of my manual as you said. Do have a nice day.