Hello everyone,
I've been reading the forums for a while now regarding all kinds of topics concerning the IS 250, but I seem to have an issue that I have yet to find a solution to.
I have an '06 IS250 with the navigation unit. I'm not from the UK, but I bought the car from there last summer.
The issue I'm facing is that some of the climate control buttons are not working most of the time, I am referring to the ones seen here:
https://prnt.sc/10iy5hr
This is a pic I found on the net because I'm not near the car at the moment, however, the navigation unit is exactly the same as this one.
The highlighted buttons are the ones that I'm having issues with. To elaborate further, the green indicator light and the buttons themselves do not light up when I turn on the lights at night. The Auto button and Rear heaters button will sometimes work, as long as the car is in working temperature.
The Off and Front defog button will work very rarely, and the Circulation and Cabin vent buttons have never worked.
I once had all the buttons light up at night, though this wasn't under any specific circumstance, they just simply lit up, though the Circulation and Cabin vent buttons did not work at all.
Even when working, the green indicator or backlight do not light up.
As far as I am aware, the previous owner had someone change the navigation touch screen because of issues and I guess that something may have been damaged during the assembly/disassembly.
I'm ruling out a fuse as the issue, because if that was the case, the buttons would not be working at all (and I assume the entire navigation panel).
I've researched a lot regarding this issue, though I have yet to find any information on this specifically, the issues I've read about were mostly all buttons not working, or the entire unit. Now, the AC works without any issues when controlled with the touch screen, but I obviously can't use all functions without the physical buttons and can turn the ventilation off only using the Voice command.
Up until now I've just tested some basics such as removing the battery for half an hour, pressing the buttons under different angles, restarting the nav unit.
I previously posted on a different forum and one member suggested that this can possibly be repaired, but would require taking out the navigation unit and taking pictures so that he can confirm.
At this point, I'm rather reserved on taking out the entire unit for fear of damaging it and the dashboard. (The previous touchscreen repair has damaged the dashboard a bit, unfortunately). I've also checked on purchasing a new or second-hand unit, but the cost is quite high and would like to avoid it if possible.
I'll be heading to a Toyota/Lexus dealership next week for a firmware update and some basic diagnostics and will make sure to ask them about this, though I would assume that they will suggest replacing the entire unit.
I will greatly appreciate any provided information and suggestions on how to troubleshoot the issue without taking out the unit if possible.
Cheers