VSC,TRAC and engine light turn on when rear window defrost is turned on.

Hello, This issue being around for 6 years without further complication shoots down my confidence in an electrical control unit failure. This really will take a good technician to handle the issue, and there is a possibility that your vehicle never even went to an automotive electrician, as they tend to be specialists. The shop that performed the work should have, at the very least, sent the vehicle to some reputable automotive electrician or technician, or paid for your shop of choice. Let me know if you have other questions, otherwise, here is a list of certified shops for your convenience. http://repairpal.com/toyota-within-10-miles-of-floral-park-new-york-11001