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If your tail lights are not working on your 2019 Toyota Sienna, but your headlights and flashers are, and multiple warning lights have also come on, it could indicate a problem with the vehicle's electrical system. Here are a few things you can try to troubleshoot the issue:
Check the wiring and connections. Make sure that all the wiring and connections for the tail lights are clean, tight and free from damage.
Check the tail light relay. The relay switches the power to the tail lights, if it's faulty, it can cause the tail lights to not work.
Check the body control module (BCM). The BCM is responsible for controlling the lights, if it's faulty, it can cause the tail lights to not work and also trigger warning lights on the dashboard.
Check the vehicle's software. Sometimes, the problem can be caused by a software issue. It's recommended to take the vehicle to the dealership and have them check the software.
If the above steps don't solve the problem, it could indicate a more serious issue with the vehicle's electrical system. It's recommended to contact the Toyota dealership or a professional technician for further assistance.
It's important to follow the manufacturer's instructions and guidelines when performing any maintenance or repairs on the vehicle, to ensure the safety and proper functioning of the car.
It's also important to check the vehicle's warranty status and the manufacturer's instructions to ensure that the repair or replacement will not void the warranty.
Keep in mind that troubleshooting and repairing electrical systems can be dangerous if you are not familiar with the proper procedures.
The fuse marked 'tail' in the fuse panel inside also supplies power to the dash illumination, check the tail lights, if they are not working replace the tail fuse and the dash lights will come back as well.
Tail lights, parking lights and dash lights are all on the same circuit...I'd go to the fuse panel under the dash and check the fuse for those lights....usually referred to as accessory lighting in the owners manual and is usually a 10A fuse.
I experienced the same after a car detail (inside and outside) exercise. I checked this and another forum. In my case the issue was that the Dimmer dial (to the left of the dashboard panel) had been turned OFF and it was depending on the auto-lights. Whenever I moved from Parking to R or D gears, the dashboards would go off. After I set the Dimmer back to some setting (Full), the dashboard lights stayed ON as before. I did not have to play around with any fuses. Looks like the dial was turned to off position during the inside cleaning.
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