250t rx-four here
I've trawled through the old forums and everyone basically says no "fun switch" can safely exist in this car and if you wanna make it 2wd you have to remove front driveshaft or something serious like that.
It's been a couple years and I've got a bit of an idea, hear me out.
Ive had a search and a lot of people have reported intermittent faults with the 4wd light coming on and the car going into 2wd mode. I've had this fault too, only occasionally and it goes away if i restart the car. The error on the japanese infotainment screen roughly translates to "Your 4wd is no longer working but you can still drive the car in 2wd, please see nissan dealer to repair 4wd".
It seems for some people the issue is caused by a faulty relay in the front of the car under the air filter, and replacing it could fix the intermittent fault. I tested mine by removing that relay and the 4wd error light came on and the car was effectively 2wd. I think this relay controls ABS too so maybe the car loses its abs too.
My question is, why don't we just hook up a dash mounted switch in line with the wires going to this relay to disable or enable it for a "fun switch" to safely make our cars 2wd at our will?
I've read some of the people on this forum reckon something like this will harm the clutch for the 4wd but why would the infotainment screen say it's okay to keep driving with a similar fault?
A fun switch wouldn't be pressed every day anyway so surely it's not that bad?