Possible Causes
WARNING: This page is about a different car, the 2002 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
DTC 13/B0100 could be caused by a short between Yellow/Black wire (circuit D+) and Yellow wire (circuit D-) in squib circuit, squib malfunction, spiral cable malfunction or air bag sensor assembly malfunction.
NOTE:
During testing, if DTCs other than DTC 13/B0100 are displayed, disregard them.