Hello Paul,
You could be right, it may need coding. Obviously, it is well beyond the bounds of probability that 7 wiper motors are at fault.
I would now want to confirm that the motor is getting a supply voltage ( apologies if you have already confirmed this).
If this were mine, having spent time and money in chasing around for 7 motors without success, I would now be at the point of investing an hour’s labour with a trusted local auto electrician.
Kind regards,
Gareth.