My wife's 2015 Murano Platinum heated seats used to work fine, but now when she turns the drivers side on, the light illuminates for about a second and then goes out - and no seat heat. Fuse checks out OK, so assume there is another module or something in-line turning the element off. Could be thermostat, but why would that turn the light off?
I would try two things...
- Remove the switch and inspect to ensure the wire connectors are still connected securely and aren'ttouching against each other or something else, which might "trip" the system and make it turn off.
- Try switching heater switches (assuming they're the same) to at least rule out of the switch as the problem, or to confirm it is the cause.
I also wondered if with the heated elements type there's some priority rotation in the "systems'" processing, so if there's high demand for other things that are of greater importance (such as auto-random safety diagnostics, keeping the CVT running correctly, and performing other routine systems checks to ensure everything's okay) maybe the heated seats wouldn't get priority or consistent/full power while other things would, which might explain the randomness of the heating. I know all the modules process things hyper-fast, but perhaps given the complexity and glut of power-consuming devices and "behind the scenes" electronics that are constantly doing things, maybe it's simply not possible to give everything all the juice it needs all the time. Maybe the system has to be selective about how/where and to what it distributes the power first.