On Mrs F's Colt the 'passenger airbag disabled' dash warning light is lit. The switch in the glovebox that you can use to enable/disable the airbag is currently set to enabled - I tried turning it to disabled then back to enabled, but the warning light is still on.
Any options other than a trip to the local garage, and if not, would it have to be Mitsubishi (there's one a mile or 2 down the road)?
The first thing to check before spending any money is that the connector under the seat is ok. They tend to be a weak spot. It may be worth unplugging it and reconnecting it a few times to eliminate that first.
(Check to make sure that the system is disarmed before doing it. Usually switch off ignition for 10 minutes or so.)