Possible Causes
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
DTC 54/B0106 could be caused by an open in Yellow/Red (circuit P+) and Yellow/Green (circuit P-) wires in passenger-side air bag squib circuit, passenger-side air bag squib malfunction or air bag sensor assembly malfunction.
NOTE:
During testing, if DTCs other than DTC 54/B0106 are displayed, disregard them.