[Guest]

when a car isn't running (i.e. no keys in the ignition)?

 

[VR6Rich]

In theory I would have thought no, but most procedures involving airbags refer to disconnecting the battery first.

 

[birdiemachine]

Yes, most definitely.

 

[Guest]

Yes, most definitely.

You sound unsure.

 

[AaronMc]

It sure is still possible. Only takes something small like a static charge to set one off, which is why your supposed to touch the earth/body before removing one..