Possible Causes
WARNING: This page is about a different car, the 2002 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
DTC 64/B0131 could be caused by an open in circuit PR+ (Yellow/Black wire) and circuit PR- (Yellow wire) in right seat belt pretensioner squib circuit, right seat belt pretensioner squib malfunction or air bag sensor assembly malfunction.
NOTE:
During testing, if DTCs other than DTC 64/B0131 are displayed, disregard them.