Hi need help and support after electrical short

Was it reverse polarity? If so check/replace fuseable link.... But first step is having strong healthy 12v power as most of your symptoms could potentially be resolved by that alone.

 

The square boxes in place of the gear shift position is usually an indicator of system being below 12volts in power. Check all your battery connections and health of 12v.

 

They could also indicate that the combination meter isn't able to communicate with the HV control ECU (U0293 ⇒ Lost Communication With Hybrid Powertrain Control Module) so it can't find out what gear shift position to show you.

Communication U codes are a little special in that you want to know which ECUs can't talk to each other. The code is one ECU (say X) saying it can't talk to some other ECU (say Y), and the code itself tells you which ECU is Y, but not which ECU is X.

That's where it helps to have a scan tool that doesn't just show you codes, but groups them according to which ECU reported them. Then you have both X and Y and you know you've got to solve a communication problem between those two ECUs.

(It can also be more than two: several ECUs in the car want to communicate with the HV control ECU, so if more than one of them can't, you could have more than one U0293 code. On the nice kind of scan tool, you would see each U0293 code listed under the ECU that reported it.)

 

Also as @ChapmanF has pointed out in the past Car Scanner (Elm) app is good for seeing which ECU isn't available. Also an An Autel AP200 will do most everything Toyota Techstream does.

 

Was the positive lead that shorted wired back to the fuse box under the hood? Presumably yes, even if not directly so. Check the fuse that supplied it. If that is good check the voltage on the outlet side of all the other fuses. (There is a little metal speck on each side of the top of most car fuses. Test the voltage there on each side and both should be 12V. That way you don't have to pull each fuse to test it for continuity.)