General yellow light

[markab 27]

Hallo newbie i have a fiat ducato moterhome 2198 cc diesel now on dashboard i have a yellow light on seatbelts sign got somebody too check and it comes up with fault b101c seatbelt tensor . Now i chechk quikly but i not have much knowledge off this is my ecn broken or do i change seatbelt tensors not sure what too do new ecm or get a proper check thanks for advice

 

[theoneandonly]

The first thing to check are the seatbelt tensioner connections, and all yellow connectors under the seats