guys i'm in a panic! i have a bravo 1999 100 hlx and its up for MOT in 3 hours. the horn has stopped working and i have investaigared all routes. The problem i believe is the ring and contacts in the steering wheel hub. how do i kill the power to the airbag safely and remove it to get at the horn contact? i'm in the middle of pulling another cable through to the cabin from the horn to get it to sound but theres very little room in the bulkhead!