My vehicle ran fine last night. I got up this morning and it was completely dead, with the seat belt light on. Nothing else, No clock, horn, lights, not a click on the ignition. Just that seat belt light. Owner manual said take to Toyota dealer.
Most likely something was left on and ran the battery down. Once a battery if run completely flat, in most cases, the BATTERY will need to be replaced. A glove box light, door ajar, trunk light or even a phone charger can cause this to happen.