Passenger Airbag harness
 

Hi, I have recurring Airbag light problem that can be re-set using a Diagnostic tool but unfortunately the light comes back on with shorter intervals each time. I have read that this is most likely caused by a poor connection in the wiring harness beneath the passenger seat. I can see the couplings but they are difficult to access and I don't want to remove the seat if I can help it. Does anyone have any advise on uncoupling the connectors (I've tried but I'm worried about breaking them - there must be a way to release the catch but it's not obvious !).
I have a Diagnostic tool, so I can reset and switch the light off but I want to solve the problem properly ahead of the MOT due next month, thanks

Airbag wiring harness
 

...by the way, the car is 2004 R52, Cooper S