I don't buy for a second there's not a lot of info for an Infiniti service tech to do a repair -- Infiniti dealer service techs have reach back access to Infiniti engineering if necessary. That's BS, who told you that? If they swapped parts and it was still broke, I'd demand my money back and would talk to the service manager. Someone didn't do their job -- and it was probably the service writer.
I did a quick search on the internet, the steering wheel heater fuse is #14 located in the passenger compartment fuse box (located by the driver's left knee), it's on the same circuit as the Air Conditioner Control, Drive Mode System, Rain Sensor, and the Pre-crash seat belt tensioner --those working in your car? If yes, it's not the fuse.
The steering wheel heater has a timer, that cuts it off after a certain time, or if it is a certain temp. This requires a control module relay that could be bad (my guess). You could also have a bad switch. Otherwise, you may need a new steering wheel if the resistance heater in it failed -- possible but not likely.
I did a quick search on the internet, the steering wheel heater fuse is #14 located in the passenger compartment fuse box (located by the driver's left knee), it's on the same circuit as the Air Conditioner Control, Drive Mode System, Rain Sensor, and the Pre-crash seat belt tensioner --those working in your car? If yes, it's not the fuse.
The steering wheel heater has a timer, that cuts it off after a certain time, or if it is a certain temp. This requires a control module relay that could be bad (my guess). You could also have a bad switch. Otherwise, you may need a new steering wheel if the resistance heater in it failed -- possible but not likely.