Tomorrow I'm going to attempt to fix/ diagnose the rear demister fault. Basically it doesn't work (i can hear a relay clicking when i press the button) and i'm also getting a 'check safguard' message. I'm going to check all the wiring for voltage and continuity at the rear end of the car, sort of around the fuse box area and up to the element. I've been reading about various loose connections, broken connections, corroded connections etc. When taking off interior trims how aware of air bags do i have to be? Obviously stabbing them with a screwdriver is bad but is there any chance of one going off in my face?