I also have this fault on a 2006 trafic 1.9 dci 100.
I know that it does not relate to any of the pretensioners as I swapped all 3 from a mates vivaro (he has no problems with his) with mine and still i had airbag and serv light. He had no lights, even though he had all of my pretensioners fitted in his.
All cable from each pretensioner were also subjected to a continuity test and resistance chech....right through to the airbag module/ECU. Both the trafic and the vivaro had the same results.
So def not seatbelt pretensioners or wiring to them.
Using scan tool 'Bosch KTS200' under the profile of 'Renault Trafic' you get fault code 'B1003' - Drivers side front airbag igniter open circuit.
If using the profile 'Vauxhall Vivaro' (still plugged in to the trafic) you get fault code 'B0011' - Driver side front airbag igniter circuitresistance too high.
Both mean same thing really, but I find generaly you get better results if you scan a trafic under the vivaro settings.
I also found that if whilst driving you bang the steering wheel about abit, sometimes the lights will go out.
I'm gonna get another steering wheel airbag contact ring and swap over.
I'll report on my results.
