Car won't start

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. I'm sorry to hear you're having trouble with your Highlander. The "Check AWD System" message may be an indicator of your issue, but it is most likely due to low system voltage. I would recommend testing the battery first, as a discharged battery is the most likely cause of these symptoms. If the battery is not the cause, an in-depth electrical diagnosis may be necessary. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!