2002 Oldsmobile Intrigue

Electrical problem
2002 Oldsmobile Intrigue 6 cyl Two Wheel Drive Automatic 82000 miles

Warning lights come on while driving and stay on. PCS, TRAC, Anti Lock and Air Bag. Service center replaced left speed sensor and repaired PCS, TRAC, Anti Lock. However Air Bag remains a problem. Comes on at " key on" blinks 7 times and goes off. Comes on at start blinks seven times and goes off. As soon as car is put in drive light comes on solid and stays. Any way to clear? Related to other warning light problem?
Service center wants to get into air bag, can't estimate price. Any advice would be appreciated.
May 25, 2009.

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