My IS350 thinks it's RHD
 

Had to replace the navi screen and the PCB that sits behind it. Sourced parts from China but they looked identical to what I pulled out. Everything works great now, except that all my buttons are backward.

Climate thinks it's Map, passenger temp thinks it's driver temp, audio thinks it's destination, etc. It's hard to mess up the wiring as most of the connectors are ribbon cables. There was one 4 wire connector (red, green, and 2 blacks) between the PCB behind the screen and rest of the unit that I managed to pull the wires out of the back of the connector. Found some pictures and think I got it hooked back up correctly.

Any chance this is the cause or do you think this PCB is coded for RHD? Any other suggestions?

What exactly do you mean by the "PCB"? What was the issue you were having that called for needing the replacement parts? I'm in the middle of a "dead" NAV issue myself and have replaced the screen with a China unit too; but still no luck in my case.

Printed Circuit Board i think.

^Well, if that's the case, I'd like to know what part on that board was failing so I'd know what to look for. It might be similar to my current NAV issue.

My issue started off as touchscreen. I attempted the repair and managed to cut through the ribbon connector - YEAH ME! Found a new display for $130 shipped. Started putting things back together but ended up destroying that PCB (printed control board) and had to order that ($50 shipped).

If you're having trouble getting your screen to come on, there could be an issue with the video/power connector running into that PCB. See attachment.

I think it's very likely the part is for RHD. Other than getting a new part, the only thing I can think of is test each connection wire in the ribbon that signals a button press and swap the wires -- but that might be very difficult to do.

How exactly did you destroy the PCB? Just curious.

Trying to force close the connector of the ribbon cable. Snapped it right off the PCB and it pulled out the pads. Not repairable.

Just wish I knew for sure if it is the PCB. if not, it's either the wires I posted above or the wire connector behind the buttons. I've found lots of wiring schematics for connectors, but none that go into the depths of the display unit.

Nothing was wrong on the board. I just broke a connector with my gorilla hands.

Anybody know what ribbon or connector controls button presses? I got into the service menu and tested the buttons - definitely flipped.

There are 3 connectors that I can see. One is about 8 wires and connects to from the back of the hard buttons into the core of the unit. Two is a 4 wire connector that runs from the core unit into the PCB on the back of the display (see pic above). The third is a wide-ish ribbon cable from the core into the PCB.

Did you guys fix it?

I wish i had a IS350

Be gentle with the PCB and cables

No. I think it's one of the connectors from the back of the buttons but have been too lazy to pull that thing out again.

I ended up pulling it out again a couple months ago and couldn't find where this was a wiring issue. Has to be the board. I've gotten used to it but pity the next owner of my IS.