Possible Causes
WARNING: This page is about a different car, the 2002 Toyota Celica. 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 D+ (Yellow/Black wire) and D- (Yellow wire) 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.