MKIV UPGRADE ISSUES (Long Post)
 

I recently upgraded to a MKIV Nav unit in my 2000 740i, and have three problems that I'm aware of. First is the voice guidance, instead of a voice, I only get a loud buzz. On two rare occasions the voice did work,but 99% of the time it buzzes. Next is the readout under the speedo on the instrument cluster. It was in English before the upgrade, now it's in another language..I think it's telling me "key in ignition", or "door ajar", or "fasten seatbelt", etc., however the radio info is in English. Third issue is the date won't set that displays on the wide screen, lower right. All info on the nav screen is in english. I've done a lot of reading and have learned the different OS versions that the nav units use. Mine reads
SW4-1/02, which in all my readings, I haven't seen the 1/02 listed. (I've seen referance to 4-1/91,
4-1/00, but not 4-1/02). Should I learn how to and install V30, or V31? I've also read about Nav Tweak and NavCoder software. Will this correct my issues? I'm very new at this and before these issues, didn't realize recoding could be done, and it's taking a lot of time to read and get a somewhat working knowledge of all this. I am willing to buy the necc. software and connection cables to try and figure this out, but I should could use some guidance and help ubderstanding this. Thanks in advance

You have multiple issues. Fortunately, most of them are easy. The two biggest things are that 1) You have a modified nav OS that you probably should get rid of (unless you know what it is and want it) and 2) You need to get the MKIV coded for your car...

This is a known issue. I am not sure why it doesn't happen to everyone. Anyway, give the solution in this post a try. Buzzing with new (used) MK3

This is most likely due to the combination of a modified navigation OS and coding for the language preferences. The language on the instrument cluster is driven by the language selected on the navigation display. My hunch is that someone modified the language files so the setting is not the same as the displayed language.

This requires a two-part solution. First, you need to get an official BMW OS update CD and get your OS to a an official 4-1/00. Second you need to get the nav computer coded so that it has your language preferences loaded.

This is a coding thing. See above-- you need to get the nav computer coded for your car.

You have a modified nav OS. Unless you know what is modified and want this, I would get rid of it. Yes, you should learn how to install an OS update, but you will also want to do the nav coding in combination.

NavCoder will fix the coding issues above. That will let you set the proper language preferences and load those into the nav computer. Also, it will let you fix the date thing. (And, I bet your INFO and SELECT buttons don't work either. See the following post. NavCoder will also help you fix that.)
Restoring INFO & SELECT is easy; white line may be a screen defect

NavTweak is one tool that people use to generate modified OS images. You can use that in the future to tailor it to your liking, but it will not help you fix anything.

Thanks for all the good information. I'm hoping to meet someone or find an Indy shop in Lexington, KY that can assist me. If I do buy the software and connecting cables, I'll still be fumbling around trying to figure out what I'm looking at!

A good indi or a dealer should only charge you about one hour of labor for the coding and OS load. That will fix everything except the buzzing voice. That might be money well spent.

You might also want to contact David Cecil who is in KY and runs the Bimmerboard web site. He also runs e38.org site and he may be able to connect you to someone who could code your system.