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BAVSOUND Mobile Electronics Forum
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Old 04-23-2017, 09:34 PM   #21
nealfromnz
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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
bk_856er
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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.

BK

Last edited by bk_856er; 04-24-2017 at 01:38 AM.
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Old 04-24-2017, 03:50 AM   #23
nealfromnz
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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.

http://s56.photobucket.com/user/niko..._0002.jpg.html

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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Old 04-29-2017, 03:51 PM   #24
bk_856er
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Disconnecting the smaller black and white connectors from the BM53 (B & C) took all of 2sec - thanks for pointing out the tabs.

With both disconnected the result is the same - AM is fine, but FM and CD result in an obnoxious high-pitched continuous tone that tracks (amplitude) with the volume knob.

Therefore, the fault is not due to other external inputs but would seem to originate in the BM53 module. The only other inputs on connector A are 9,10,11. I don't think it's related, but I have dealer records indicating that the first owner experienced a "telematics failure" in 2003 and the factory installed phone was subsequently removed as a fix. Zero aftermarket electronics or wiring hacks on this vehicle.

Seems the best course is to decide between another BM53 or start over with a Dynavin N6.

BK
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Old 04-29-2017, 06:04 PM   #25
nealfromnz
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You've certainly tried all options for troubleshooting and am tuner having no noise suggests final stage ok.

Good luck with next choice for replacement.
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Old 05-10-2017, 10:35 PM   #26
bk_856er
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Ordered a replacement/remanufactured BM53 from the dealer today @ ~$450 + core.

Really wanted an N6, but trying to keep the costs down on the family car and never really disliked the factory setup for its integration.

With the current BM53 I believe I can also add an Aux input at the headunit harness, so that will at least go a little ways to extending the functionality. Might spring for a speaker upgrade unless something goes horribly wrong.

BK
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Old 05-11-2017, 02:22 PM   #27
nealfromnz
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Yes, newer units have aux and also id3 tag support for later CD stackers or stacker replacements that integrate Bluetooth/ iPod devices.
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Old 05-19-2017, 09:38 PM   #28
bk_856er
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Remanufactured current BM53 just installed and all seems to be well!

Nice surprise to get RDS with station name, artist, song title scrolling.

I forgot how crappy the stock speakers sound, but at least there is now music.

BK
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Old 05-20-2017, 12:54 AM   #29
nealfromnz
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Enjoy the new unit !
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Old 05-20-2017, 01:06 AM   #30
bk_856er
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Quote:
Originally Posted by nealfromnz View Post
Enjoy the new unit !
And a special THANKS to nealfromnz for all his help and suggestions and sharing of info!

BK
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Old 05-20-2017, 01:18 AM   #31
Onizukachan
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Quote:
Originally Posted by bk_856er View Post
Remanufactured current BM53 just installed and all seems to be well!

Nice surprise to get RDS with station name, artist, song title scrolling.

I forgot how crappy the stock speakers sound, but at least there is now music.

BK
Very cool. Sadly at least one of the stations here has discovered they can "monetize" their rds info... it's a constant advertisement for some law firm instead of info about what song is playing.
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