I have what others have run into... Nav version MFD works fine for most buttons on the left but the buttons on the right relating to Nav just bring up either a blank (dark) screen, or a dark screen with vertical white lines. Initially, I had communication messages and diagnostic errors regarding communication with the nav unit. I reflowed the 60 pin connector between circuit boards and now I have no communication issues - at least detectable by the diagnostic mode. But I still have the same blank screen or vertical lines when trying to access nav. When bench testing the MFD, it powers up fine and when I select the nav functions, it just says the nav is disconnected but the screen looks fine. Others with similar symptoms have mentioned replacing the MFD solved it but I haven't heard of anyone actually finding the culprit. My NAV unit under the left seat has power and connectors are tight. NAV CD seems fine. I just recently replaced the capacitors in my dead CM which fixed that. I'm wondering if the caps in the MFD would cause these symptoms? Fairly new 12v battery. All fuses good. Reset nav system several times (12v disconnect) It's a new car to me so I don't know the history of this specific problem with this MFD. MFD model 86110-47220 (bluetooth) I will check grounds for the NAV unit in case there is an issue there. Any insight to a specific fix for these symptoms would be much appreciated.
When I wrote "most buttons on left" work, there are a couple screens that bring up a blank screen. They are secondary screens under the maintenance section and another one that I can't remember. Maybe those issues indicate more than just the Nav system? Could I have missed some pins on that 60 pin connector?
I usually just have a spare on hand to try so I don't know anything about all this as far as all of the disconnection and tracing
I opened it back up and after looking at the capacitors, some are looking a bit puffy. I’ll change them out and see if that takes care of it.
Max posted a pretty thorough report on MFD isim.. It's pretty complete What was discovered at the end of all that long text was that when all of the boards are sandwiched together and assembled there is one connector down at the bottom of the sandwich that is misaligned twisted whatever you want to call it Not on every MFD but on enough of them I guess how they know this I don't know they saw theirs but it's pretty interesting article anybody that's messing with an MFD should take a look at it they break the MFD all the way down into the four or five pieces that are sandwiched together that makes an MFD goes into pretty in-depth discussions there are some alternative part numbers and so on and so forth it is a Toyota reprinted article I do believe It was just in the last two days so it should be right up above me somewhere we'll just have to look for it I can't help you with that but it is extensive You need to have a look at it. If none of this interest you just pick another MFD from another car over any one of the junk yards If it doesn't work they'll let you get another one and keep doing that till you do Don't put the vents back in till you know you have a good MFD working the way you like it then put the vents back in and the button panel and the lower knee panel and whatever you had to take out that way there you don't destroy your vents and all of that sort of thing.
