Hello, my name is Mark and I will try help you with this.
You cannot use the paper clip method to clear codes on this system.
This will require a suitable scan tool.
Also, the fault will not clear until the fault is repaired. Are you certain the fault was caused by the connections under the seat. Although these are a common problem.
This was first thing to try, as you say it's a common fault
Are there any other pointers you give me to achieve a result
Without a scan tool to find out what the actual fault is is difficult. With this system, even though the fault can be fixed the light will stay on until the code is cleared. The next usual cause is the clockwire unit behind the steering wheel,but you really need to have it scanned first to stop wasting time on parts that may not be faulty.