Hi guys! First time poster... So I was working on installing a custom stereo system in my new Prius C. I had the main 12V battery removed for awhile. I put everything back together and now I get an error screen when I go to start the vehicle: CHECK HYBRID SYSTEM STOP THE VEHICLE IN A SAFE PLACE IMMEDIATELY Vehicle will not go into ready mode and is undriveable but all electronics turn on and work. Some research on the limited amount of Prius C information so far has shown that disconnecting the 12V battery may cause this screen to show up. Also that some installers have bumped into the orange connector on the hybrid battery and this will also cause the error screen to show up. Here is what I have tried so far: +Cycled ignition on and off multiple times (I believe they said it was 3 times for original Prius would clear this screen, no luck) +Checked voltage on 12V battery: measures 12.3VDC under load (vehicle in start mode) and also not under load (vehicle off) +Checked that orange plug on hybrid battery is properly inserted +Checked for Check Engine Light (CEL) codes, none +Checked in the factory owners manual (said call Toyota dealer immediately, no further details) +Called Toyota dealer, said they don't know and to tow it in (no help) I should also mention the entire interior has been removed. I made sure all essential plugs are back in, only thing not connected is the passenger seat and light for the trunk (shouldn't impact driveability as I drove it like this before no problem). Problem showed up after I disconnected the 12V battery. I suspect there is a reset procedure to get it out of this lockdown mode but I can not find it listed anywhere nor does anyone I've talked to knows what it is. Either this or 2. I blew something up or 3. Something is still disconnected somewhere despite my searching. Any help (besides telling me to take it to the dealer) would be greatly appreciated. Thanks!