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Old 04-23-2017, 09:34 PM   #21
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Join Date: Jan 2016
Location: New Zealand
Posts: 144
My Ride: 2002 e46
Can't see if you have a mk3 or mk4 Nav module.
I retrofitted a mk4 and volume changeable under latest version of software ( something for later)

So a couple more things to check/ test then. Put tuner onto radio and disconnect plugs b & c so it has no audio inputs from other modules are connected. If tone is still there it's coming tuner. Thus eliminating anyother source as noise.

From there I'd double check the ground connections which connect to a comb near by. Most of the modules will connect to a comon place . ( ground loop maybe ? )

This is what it looks like on my coupe. Note the 4 gauge cables are my amp grounds so won't be there on yours.

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Old 04-24-2017, 12:13 AM   #22
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Join Date: Mar 2011
Location: Bay Area
Posts: 84
My Ride: BMW
NAV hardware in this 2003 325XiT is MkIV (aka, Mk4) with NAV OS v29.1 from 9/7/07 updated by me. Found the CD I used. Looks like there is a v31 available for this hardware.

Do the BM53 A/B/C plugs actually separate? I'll need to inspect. That's a good idea to test just A and eliminate the possibility of B/C contributing to the issue.

Most of the ground point connector (comb as you call it) is hidden behind a vertical carpet panel with integrated speaker grill. I'll see if I can get to it.

*edit* For giggles I just updated the MkIV NAV to v32 software (the latest available). I don't think it's related, but the radio will no longer power on from the front knob. I do still get voice from the steering wheel phone button.


Last edited by bk_856er; 04-24-2017 at 01:38 AM.
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Old 04-24-2017, 03:50 AM   #23
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So on the plug the smaller white and black connectors insert into he main connector. They have tabs at the top of the connector. Gently PRI the tab with a small flat blade screw driver and they will pop out of place. You just reinsert them and they click back into place.


On the nav front v32 is latest / last version. I think the main difference was night mode setting and perspective if not already in your version.

There are also some versions around based on v32 that give different start up splash screens and Points of interests such as speed cameras. Requires a multistage process of building an ISO creating icon and sound for fixed cameras and feeding in a file of GPS coordinates for fix cameras in your area. I'd be a bit cautious over these versions.

On v32 disconnect all your power and completely reset the system. It should come right.

Last edited by nealfromnz; 04-24-2017 at 03:52 AM.
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