Park Button not working unless....

I have a similar problem and a generation two at a towing lot right now and from what I've looked at I've seen some Russian guys who fix this problem in a generation too and it turned out the wiring that runs under the crankshaft pulley that goes to whatever that position sensor is this down there somehow that wiring got damaged and they were having that wiring loom apart and we're standing there soldering some connections together to make it work again they did this via an American English printed manual that's laying next to their computer while they're figuring out what they're doing quite an interesting video you really don't need to understand the language pretty smart guys till they put the car up on the lift and they look under the crankshaft pulley and then split that tape or loom apart they see the damage whether the crankshaft pulley did that at some point and someone taped it up or what happened I don't know but I know in the generation too you check a fuse and you check a blue wire under this black piece in the fuse box and if you don't have the 12 volts at the blue wire you can run a jumper from the 7.5 fuse to get that 12 volts on the blue wire and that connector I have the blue 12 volt wire with 12 volts without the jumper in this car but it still will not go into ready and will not park the car rolls no matter what. And I do have the code I can't remember what it is 3102 something like that and I'm I can't remember the sub code but it prints out and I meet all the requirements that's what's got me stumped about this particular vehicle.

 

I would focus on getting the trouble code when the warning triangle comes on. That will reveal what the ECU thinks it's seeing.

Now, the fact that it sees that when you turn the dimmer down makes for an interesting puzzle. But it's hard to start putting a puzzle together until you've got the pieces in front of you.

Now, several of the car's ECUs can also make one or more voltage readings and report them in live data. I would start with the power management control ECU, as that's the one that's giving you the warning triangle, but I wouldn't rule out going and looking at others. I'd be looking for some voltage readings that change as you turn the dimmer. The culprit is probably some inter-circuit short or poor ground allowing the one voltage to affect another, and any chance to see a particular reading being affected would be a great clue.