Ouch, I got the same scare, the black thing (top cover blew off, and the white roller undid itself!!!!!
On that, my wife came in and told me, but again you take this car apart...it's still going to break down...thank you for your trust !
;)
in my case the cable is dissociated, the big yellow one makes the air bag, and for the horn 2 wires, black and black and purple, yes I'll try to change the position of the wires to see if it works.
Thanks to you all, thanks to you I'm going to make an appointment with the technical control at last!!!!!