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Subject: MKIV Voice Buzz Issue SOLVED !! Author: druzil : member since July, 2004 : 2 posts Posted on: 2004-07-19 02:46:31

For those of you having problems with their MK4 Nav units buzzing at them instead of talking, I have the solution.....(at least for my car)

Man this problem took a lot of work, but the solution is so simple. Thanks to everyone who gave input and advice. The problem in my car was that the voice negative wire was grounded when it shouldn't have been. In my case, all I had to do was remove the wire from the NAV harness plug and the problem was solved. My NAV computer now talks correctly all the time. No more buzzing!!!

More details:
In my case, the wire I'm talking about is the Voice Signal Negative wire. It is Pin 18 on the blue navigation plug on the back of the MK4 unit (connector X1313). This wire should not be grounded. If there is continuity between this wire and your car chasis, then this is most likely your problem.

Here are the steps I used to fix my car ('99 750iL):
1) Disconnect the battery....
2) Pull the nav unit out of the car
3) unplug the harness and antenna cable and set the nav unit aside.
4) pry the inner black connector out of the blue harness plug with a small screwdriver. Be careful not to break the blue cover.
5) Verify with a multimeter that pin 18 is grounded. If not, check all the other wires to see if any are grounded that shouldn't be. Maybe other wires could cause a similar problem.
6) Remove the pin 18 wire (yellow w/ brown stripe in my car) by pressing the small metal pin and carefully pulling the wire out of the black connector.
7) Once out just tape the wire back with electrical tape, put the connector back into the blue plug, and hook back up the nav computer.
8) Reconnect the battery and see if it is your lucky day.

Hope this helps.

Cheers,

Eric

• MKIV Voice Buzz Issue SOLVED !! - druzil 2004-07-19 02:46:31 (9777 views)
  • Excellent info! - M.Wong 2004-08-12 15:47:15 (765 views)
  • Here's a link to more information, too (url) - DavidC 2004-07-19 11:47:20 (1431 views)