Possible Causes
WARNING: This page is about a different car, the 2004 Toyota Matrix and 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Trouble Code (DTC) 58/B1186 could be caused by an open in Yellow/Gray (circuit P2+) and Yellow/Pink (circuit P2-) 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 58/B1186 are displayed, disregard them.