WARNING - if you decide to have a look yourself, observe the safety precaultions around airbag systems - mainly the need to disconnect the battery and leave for 15-20 mins for any charge to discharge - don't want any accidental inflations!
Just to explain a little from the code reader results:
System type: 2F-2L-2T-I. I think this indicates what parts are connected, something like:
2 x front airbags
2 x side airbags
2 x curtain airbags
1 x inertia switch?
Curtain airbag - you know where these are now.
Explosive charge - the device that causes the airbag to inflate.
Drivers's side - that's norrowed it down!
S.C. to ground - Short Circuit to ground.
Intermittent - oh dear -fault comes and goes!
So, the airbag control unit (mounted on the floor in front of your centre console) monitors the various sensors and airbags for faults including short circuits to 12V or to Ground and for Open Circuits.
Probable causes:
Connections faulty - more likely to cause open circuit than SC to ground.
Wiring continuity - again, lack of or poor continuity is more like OC than SC.
Wiring insulation - this is nearer - if for instance a wire has chaffed, it could be touching earth intermittently.
Clock Spring faulty - Hmm - the clock spring is used to connect the airbag in the steering wheel back to the control unit. Not likely to affect the curtain airbag.
Squib faulty - the squib is the explosive charge. Indeed this could have an intermittent earth fault.
Control unit faulty - possible but I would say unlikely.
Faulting strategy? Sort yourself a code reader for a tenner and adapt it to read/reset the airbag unit. I did this for a Mk2b airbag problem and wrote a guide:
https://www.fiatforum.com/punto-gui...eset-ecu-airbag-errors-mk2-tenner-laptop.html
Now you can check for yourself to see the fault logged and also reset it while you dig deeper. Maybe try disconnecting that airbag, though that may just force a different error (sensor missing or faulty). If left and right airbag units are the same, try swapping them to see whether the fault moves.
If we can trust Haynes, here's the wiring for the curtain airbags:
Driver's side curtain airbag:
Pin 1 goes to Control Unit connector B18 (green)
Pin 2 goes to Control Unit connector B17 (yellow/red)
Pin 3 goes to Earth (black)
Passenger side curtain airbag:
Pin 1 goes to Control Unit connector B19 (blue)
Pin 2 goes to Control Unit connector B20 (orange)
Pin 3 goes to Earth (black)
red