Help: 2002 X5 Navigation Screen/Radio Electric Problem

[mazatraz]

Hello... I have a 2002 BMW X5 ... And recently, when I start the car, the Navigation screen will not come up (all I get is a blank screen), and the radio would work for 2 minutes and then turn off... I checked the wiring for the Nav screen and MK III system (in the trunk), and everything seems to check out (no cross wirings or lose wires)...Any ideas what it may be? Thanks

Maz

[KiwiJochen]

The Mk3 has probably crashed and died.

But check the following:

When the radio is on, can you control it (change stations etc) and see the station names in the display on the dash? If so, radio is fine

When the radio comes on and the ignition is on, can you see a faint glow on the LCD broad monitor screen? If so, the backlight is OK and likely the nav is the problem

The easiest and surest way to tell is to swap the nav with a working unit from another car. Ask on this board for fellow board members living near you to help you

If the Mk3 has dies, the easiest and best thing to do is replace it with a Mk4, much faster and improved graphics, 3D view, and more customisable.

[dok47]

i am having same issue. It was fine and when i shut engine down and tried to put PIN code to protect it i could not confirm last number. I turned off unit and after that i could not get it on. No lights no sound from radio. Nav unit in back is making sound but screen is dead just like lights on it and no function at all. Also few days before that hapened i noticed that BC button on turn signal handle stoped responding too. Any ideas. Oh one more thing....turn signals sometimes dont work too, not ewen when i press all 4 turn signals buton!?!? Now they work but screen is dead. ....any ideas before i start taking it apart? i already checked all fuses in back and front.

[KiwiJochen]

The ibus is not working correct.

Diagnose the ibus with a multimeter or with NavCoder.
Disconnect devices one by one until you find the device that is hanging up the ibus

May also be the electrical part of the ignition switch that is the problem

[dok47]

turn signals now work but not showing it on tacho unit. And also just found out that backup lights in back dont work. all other lights in back work only those not. no power coming to them at all :I

[Brian-bmw]

Originally Posted by dok47

turn signals now work but not showing it on tacho unit. And also just found out that backup lights in back dont work. all other lights in back work only those not. no power coming to them at all :I

This sounds like it could be a bad battery or ignition switch. When the car has low power, you get multiple unusual symptoms in the electronics. The turn signals is one that I have personally seen with a bad battery. Others are auto door locking at 5 MPH quits working. You might also get a Trans Failsafe Prog. error on the dash. Nav and radio not working are also common.

How old is your battery? If it is original or more than 5 years old, you might consider replacing it.

[dok47]

Battery is 3 yrs old they put new one in BMW service. It is strong except in winter if i drive short distance often and it gets like -10C then i need to jump from another vehicle..now i summer and it is working fine. Also ignition switch i put new one last summer because i saw on this forum that people think that could be problem draining batery in winter so i replaced it, it was not expencive.

[dok47]

turn signals function but only not showing in dashbord that they are blonking when i use them. whe i pressed buton to eject cassete from navi/radio it came up with start up logo and did not get eny further from there
there was raining for past 2 months every day. i tought maybe water got somewhere but i could not find anything wet inside car.

[KiwiJochen]

what voltage is displayed on the instrument cluster?

The fact that you have to jump start in winter is evidence of a bad battery.

A good battery can sit for a week at -15 deg C and still start the car.

[jgabler]

Is there anyone in the Salt Lake City area that can help me with my nav/radio problems? I need to see if I can temporarily swap the nav unit out with someone to see if that is the problem. My radio stays on for about 2 minutes and then shuts off. My nav screen has a back light but does not display any info. I just unplugged my nav unit and the radio still only plays for a few minutes. I may need to replace it with a new nav unit but don't want to waist the money if that is not the problem. If someone is in SLC area that can help me out I would appreciate it.
Thanks