2005 Pontiac Sunfire Air Bag light Driving Me Nuts!

The car in question was salvage it was in a frontal collision and both driver and passanger bags deployed.

I've replaced both bags, inspected the wiring and clock spring. The light stayed on.

I took it to a dealer they said "no communication with sensing diagnostic module, ok with all other modules"

They want yo replace the SDM and front end sensor at a cost of $804.30.

I got the parts from a wreckers replaced them and the light is still on.
I need to get an inspection to get this car on the road
but am sure they won't let it pass with the light on.

ANY IDEAS WOULD BE APPRECIATRED!