My door locks, auto steering wheel tilt, window controller for every door other than the current one, and auto headlights all went out out of nowhere all together. What could this be and how do I fix it.

 

Hello,

It appears that you are reaping the consequences of a rather strange decision made by Toyota back in the day - All the Body ECUs in that car are connected in Series with each other, meaning that disconnecting one ECU in the line disables all the other ones. Below is a Diagram for the Communication Bus on those cars, it appears that you will have to go over all the ECUs listed there to check for Internal Damage, or the Faulty Connection, as far as I am aware, there is no better way to do so, even if you have Techstream for help.



Hope this helps and best of luck!

 

First thing to do is test your battery, and for a good alternator. Clean any corrosion around the terminals/cables at the battery. Then follow the grounds and ensure they are connected, tight and not corroded. There may be a fuse blown that it affecting that entire circuit. This usually happens when someone backwards jumps/charges the battery (reversing the cables). It would be a larger "main" fuse in that case.