Possible Causes
WARNING: This page is about a different car, the 2002 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
DTC 73/B0135 could be caused by a short in circuit PL+ (Yellow/Black wire) and circuit PL- (Yellow wire) in left seat belt pretensioner squib circuit, left seat belt pretensioner squib malfunction or air bag sensor assembly malfunction.
NOTE:
During testing, if DTCs other than DTC 73/B0135 are displayed, disregard them.