Morning Seamus , simply unplugging & refitting the cable or fitting resistor does not work to remove codes . The codes need to be cleared after the unplug / refit several times process and the same before you install the resistor . SRS codes are known as hard codes that will not simply reset after so many correct functions at power up . It is also possible the tensioner has " fired " & then you will not be able to clear the codes without replacing the seatbelt unit
Ignore the final code & deal with the top 3 , They all indicate an issue that possibly is nothing more than corroded contacts on that circuit . break & remake the multiplug connection spraying wd40 or similar as you do so , with a few final sprays of brake cleaner to remove any traces of wd40 , or whatever you used . Spray lubes tend to attract dirt & dust making the problem reoccur , I tend to apply silicone grease around lead end of plug before fitting .
Hoping this helps
