745i navigation, radio, and sound system problem

Good morning PAPER, I am glad to hear all is well with your daughter....

All you guys that lost Radio and GPS etc after window tinting. A problem that has happened to many owners here in OZ is this.

As you are aware all the antennas reside in the rear window. If you get your rear window tinted with metal particle film, which is nice and dark and will last a long time, it is guaranteed to interfere even cancel completely your cars ability to receive signals.

After my car was tinted, I lost everything. I went back to another tinter and he pointed out that you cannot use metal particle tint on the rear window for that very reason. He removed the metal particle tint, and replaced it with a special tint designed for windows that have antennas in them, and I got full radio and GPS etc all back.

So I am just wondering for those of you who have lost signal after getting the window tinted, check to see if you have had your windows tinted with the metal particle tint. It is cheaper than the correct tint that you should use on your rear window, but I know this worked for me and fixed my signal loss.

Here is a link to the MOST bus circuit diagram. It is important to note that each device produces it's own light to send to the next device. If you have lost light arriving at one device, I would be looking to the device before it to see why it is not producing the light to send to the next device. Each device has it's own receiver and a light transmitter/producer. From what I have read and learned, the light doesn't start anywhere, each device produces it's own light to transmit..... that's what I have learned and understand so far.

http://wds.spaghetticoder.org/en/svg...8308.svg?m=e65

No I have not.

disconnect 1 module at a time and plug in most bus loop then switch on car. in other words, disconnect the gps, plug in most bus loop and test and so on. Have you plugged the car in to GT1 or DIS or launch system to test modules? Have you tried disconnecting the most bus loop and reconnecting? Have you checked battery voltage? Have you tried to do reset of all systems? go here for repair manuals: http://tis.spaghetticoder.org/e65/745i_(N62)

The only module I have not been able to test independently is the radio unit... I know where it is but I haven't been able to find instructions on accessing it, I don't want to tear apart the interior getting to it. Battery voltage is good (tested), I have reset the systems and disconnected/reconnected the most bus loop. I don't have access to a GT1 or DIS.

try link above... get the car diagnosed before digging any further. Have you had the L7 tested and did you recode the ASK unit?

Originally Posted by jssmi765

The only module I have not been able to test independently is the radio unit... I know where it is but I haven't been able to find instructions on accessing it, I don't want to tear apart the interior getting to it. Battery voltage is good (tested), I have reset the systems and disconnected/reconnected the most bus loop. I don't have access to a GT1 or DIS.

so you tested the amp , voice module , cd changer , navi unit & the rest of
the stuff in the loop ??? if you tested all that & the problem is still there ,
then it must be your radio ( Ask unit )

what exactly is your problem ???what is your radio doing ???

my navi radio cd,etc went out so i read the fourm and i took the (foc)most coupler out of glovebox and tried on navi it dident work and when i pluged my foc most coupler back in the glove box i get all kinds of error messeges like (abs out, systronic out cruise contol out ac doesent and power steering dont work pleaseeeeeee help what should i do thanks alot jack jae.good@mail.com p.s. i went out n bought another coupler and it dident work either

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Originally Posted by TechFreak

Yep...correct !

thanks for all the posts and links, was able to trace my problem the the ASK unit, replaced unit and all is right with the world. this is a great forum for the novice or DIYS car geek.

Got a similar problem trying to diagnose MOST bus.


http://www.bimmerfest.com/forums/sho...d.php?t=671068

Here's my problem:

"BMW" is only displayed (PIC#1)on the navigation screen (unless I break the MOST fiber loop-more info later). Wont do anything! No radio, chime, voice control, ect.

I tried that trick to bypass modules (ASK CD player, Voice Controller, CD changer, L7 Amp, Tuner) to exclude them from the MOST bus but not seem to be gaining any ground. I took that factory fiber loop from the glove box to bypass these modules.....

FYI: I did not have to purchase a spare, I just took the loop connector apart and connected the two end together (the fiber ends in the glove PIC #3)-this seemed to do the trick. It seems if ring bus is broke the red LED does flash, when connected red LED stays light. I took the actual fiber optic line out of the connector housing and used it for bypassing.

......1) when I used the 'fiber loop' to bypass any the modules in the trunk and including the ASK or CD changer in the dash (PIC #5), nothing happens. 'BMW' logo will still be displayed on the screen.
2) when i take any of the modules out of the network ring (unplugging ANY of the modules-not 'bypassing' anything) I DO GET the 'accept' prompt on the nav display (PIC#7) and can navigate through some functions but can operate only the climate functions. No Nav(PIC#8) or radio (PIC#9), chime, ect. I can only scroll through.
3) I also tried that trick to go into the MOST diagnostic screen (PIC#10), but nothing comes up under the 'MOST' menu. Again, the only way can control anything on the Nav display is when the MOST fiber ring is broke. If I try to connect the fiber ring back together at that point, it will just freeze on whatever is display I have up.
4) Nav disk DVD does seem to spin and eject fine. Although I have noticed it will still spin when the ignition is off.
5) Dash CD player seems to a spin the CD, but no sound of course.
6) CD changer tries to eject a the cartridge. But it never worked anyway.
7) All the modules seem to be transmitting light via the fiber.

Basically, the 'BMW' logo stays on when everything is connected and I cant do anything.

I got my whole car torn apart and need some advise on what to do next?
Do I need some software to reset the ghost errors after bypassing each module?

http://www.bimmerfest.com/forums/sho...t=#post7324530