Buy OEM Lexus Part # 6912053030 (69120-53030). Door Lock Actuator Motor (Left, Front). Door Lock Actuator - Repair or Replace Your Lexus may need a new door lock

ACTUATOR ASSY, FRONT DOOR LOCK, LH

Fits IS 300

Door Lock Actuator - Repair or Replace
Your Lexus may need a new door lock actuator if your keyless entry doesn't work or your lock button doesn't lock the doors.