One problem related to front seat belt has been reported for the 2005 Infiniti G35. The most recently reported issues are listed below.
I have just purchased a 2005 Infiniti G35 coupe. My wife is the primary driver and is 5ft 2" tall. The problem we have is that when she drives the car and buckles her seat bealt the edge of the strap of the shoulder belt goes right across the side of her neck. I have contacted the dealer and they have told me that there is nothing that they now of that can be done. The ironic thing is that on the sedan version the belt is adjustable up and down. My fear is that if there is an accident that this proble could cause serious if not fatal injury to her if the belt locks during an accident.