Broken navi computer?

herbie · #1 02-07-2006, 06:41 PM

I have trouble with my MK IV on a E46 (2001 330i Touring).

The car originally had a MK III, but that was toast when I bought the car (used) and the dealer replaced it with a MK IV. The front end is the mono car radio with tape player and the small mono screen, not the fancy 4:3 or 16:4 screen.

The problem is that the navigation computer is sometimes having trouble with orientation. While standing still in a location not covered by the map, the big arrow that is displayed sometimes suddenly starts turning around as if the car was spinning around. When driving on a road covered by the navigation CD, the navi suddenly tells me I need to turn around or that I'm driving on a non-digitised road, a couple of minutes later it again finds the correct position and then again is lost a couple of minutes later. The antenna cable is correctly connected to the navi computer.

I have to mention that I had trouble with the car battery often running down. The service center did some troubleshooting and they pinpointed the navi computer as the source using too much power and temporary disconnected it. I had no problems with the battery in the timeframe the navi computer was disconnected. I have since reconnected the navi and it seems like it really doesn't stop. If I just sit in the car, closing and locking the door, I can hear the DVD motor on the navi computer running. I waited for 10 minutes and it was still running. How long after locking the car should the navi computer be turned off?

I'm very hesitant to again replace the navi computer as the current one is practically new. Could there be some other component causing trouble? Is something else powered by the power connected to the navi computer (for example is there a antenna booster/amplifier that could have been disconnected when we disconnected the power to the navi computer)?

Also, based on the navigation training manual for the MK III, while in the service menu the Gyro sensor should have values around 2500. On my navi (a MK IV which is not covered by the training manual) the reading is from 800 to 1200. Is this ok? Could somebody with a MK IV please check what the Gyro sensor reads on your car? Go to the Main Menu, then select Set, then hold the Menu button for 8 seconds and you will be in the Service menu. Select "Sensors" and look at the values for the Gyor sensor.

Thanks.

appy · #2 02-09-2006, 05:43 AM

Hi,

this is a knowing problem.
I don't know witch software version you got, but the solution is:

Start your car, and let the car running.

Do a downgrade from your Navigation software, it doesn't mather witch version, say the V22.

After that you put the NAV DVD back and test the system.

If everything is oke than you take take the V26 and do a software upgrade.
After that you put the NAV DVD back and test the system.

If everything is working well you close the car. Open the trunk and lock your car. After a few minutes the light on the MK4 has to go out.

And your Nav computer is oke again.

greets Appy

herbie · #3 02-09-2006, 02:56 PM

Thanks for the tip, but unfortunatelly this did not work. After downgrading the firmware to V24, the language was reset to German (it was previously set to English) so I guess something was reset in the nav computer, but it still does not shut off even after one hour of waiting.

appy · #4 02-09-2006, 06:02 PM

Herbie,

i don't know who is telling you those fantastic story's. If the language is D/F/E

you can do as many software up and downgrades you like, you never wil get an other language.

But for me it is oke.

Appy

Quote:

Originally Posted by herbie

Thanks for the tip, but unfortunatelly this did not work. After downgrading the firmware to V24, the language was reset to German (it was previously set to English) so I guess something was reset in the nav computer, but it still does not shut off even after one hour of waiting.

herbie · #5 02-10-2006, 02:41 AM

You are misunderstanding me. What I am saying is, that I configured (in the menu) the language to be english. After doing the downgrade, the language was set to german, which means that probably some internal memory was reset (which probably was the point of the downgrade-upgrade, reset the memory to fix the navi computer). Unfortunatelly this did not help, the navi computer still does not shut off.