I have disconnected the battery on mine for charging and no code required on reconnection.
Cheers thanks for your help, in the end there were only two connections, one plug and one connection to break into wiring reversing lights, took a chance and did not disconnect the battery and all was well, except when the garage sorted a leak in the rear diff, they forgot to fill it will fluid, therefore noisy diff, returned the car and got my money back, now have a 2015 5 seat Santa Fe tow bar wiring harness I don't need!I have disconnected the battery on mine for charging and no code required on reconnection.