Possible Causes
WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
DTC 77/B1195 could be caused by a short between Yellow/Gray (circuit PLR+) and Yellow/Pink (circuit PLR-) wires in driver-side rear seat belt pretensioner squib circuit, driver-side rear seat belt pretensioner squib malfunction or air bag sensor assembly malfunction.
NOTE:
During testing, if DTCs other than DTC 77/B1195 are retrieved, disregard them.