I just bought my third excursion which is a 2000 limited with 7.3 and 4x4. It has 153k miles so I am working through a few minor issues. The airbag light comes on when started. It blinks three times, then pauses, then blinks two more times. Does anyone know what this code means? The previous owner thought it may need a new clock spring that he had read was a recall. Any thoughts? Thanks in advance!