Air Bag Light On problems of the 2007 Lexus IS

We had the passenger airbag replaced as part of a recall. This work was performed by a certified Lexus dealership. When we got the car back after the repair, the passenger airbag light showed �off� even with a passenger in the seat. This airbag light and sensor had always worked correctly prior to the airbag replacement by Lexus. There are multiple complaints of the airbag wiring harness being too short and the replacement airbag causing this same Issue for many other Lexus owners. When we brought the car back to Lexus, they said we would need to purchase a new ecu sensor for thousands of dollars and that this Issue was not part of the recall and not caused by the repair. Again, this Issue arose due to the replacement of the airbag which was performed by Lexus and a required recall.

Started the car this morning 3/29/15 and air bag light came on. Drove to store and came back light still on. Got home light still on. Went to auto shop gave me a code of b1861 srs driver side knee air bag. Sounds very dangerous and im afraid that the air bag wont deploy durning accident.