Airbag light 2005 Chevrolet Trailblazer 4.2L. Replaced the clockspring and left front impact sensor. We put our scanner on the vehicle, and it showed codes B1022, B0042 and B0104.
Answer: Well, first, the Airbag code B0104 code is for the front end impact sensor #2- right side, not left.
The other codes are usually because of a broken or missing connector position assurance tab on the driver airbag connector, or a bad airbag. There is a small connector assurance tab on the connector that most people either break or throw away after replacing the airbag. This little tab aligns the terminals, and is more than just to prevent the terminals from backing out, as with most all other electrical connectors. If it is missing, the terminals do not contact and cause an open circuit. There is actually a service bulletin with new part numbers for the tabs.