I am installing DRL and was going to also check the cabin filter you are talking about? Do you need to disconnect the air bag for this?
I'm not sure that you have to disconnect it, but the Haynes manual says to disconnect it to keep it from going off while you are right there (in case you trip a sensor or whatever), as a saftey precaution. And since your head will be relatively close to the airbag, I would follow this safety precaution. It's easy to disconnect, there's a place on the line near the cabin filter that you just unplug (after unplugging the battery).
If you don't have a Haynes manul, pick one up, it's been invaluable to me.
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