I got my tC used a while back and I’m the third owner, anywho someone wired a relay hooked to a little black box with Toyota brand on it under the dash next to obc port and taped it with electrical tape but it’s dangling next to the pedals. I’m trying to see if anyone has an idea about where to find a service book or wiring diagram, or if some one has a 10 series and can take a photo of under there dash next to obc port looking towards center dash so I can hopefully see what the previous owners did and how to clean up the mess. Disconnecting the relay hasn’t created any problems as far as starting and driving the car, but I don’t know what that little black Toyota box is for. I’ll post some photos once I get home. I’m trucking at the moment.