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Old 01-28-2016, 01:00 PM   #1
nka
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Join Date: Dec 2013
Location: Detroit, MI
Posts: 3
My Ride: 2004 325ci
Bluetooth sound issues 5th gen ULF

Hello all,

I have a 2004 325 CI with HK sound system and BMW assist preinstalled. Recently, I purchased a 5th generation ULF (84 21 6 945 387 end of life 01/05 5th generation) off Ebay and installed via this tutorial. The only step I skipped is that I did not install a SES jumper plug because my blue 26 pin plug already had something attached to it (see pic), which I believe is an SES jumper plug, although it looks different than this. Installation went fine and bluetooth works except no voice activation (which is no big deal).

However, whenever I am on a Bluetooth call the sound coming from the speakers is staticky and scratchy, and it is made worse by increasing the volume. In other words, the sound is not crisp. The caller on the other end says that I sound fine, so I don't think the mic is the issue. The speakers produce crisp sound when playing AM/FM, CD, so the sound system is fine too.

I am wondering if this is just a problem with the 5th generation ULF, and as the gens progressed the sound quality got better? Or, is there some defect with my ULF? Again, the only step that I skipped in the tutorial is that I did not install an SES jumper plug. I left my Blue 26 pin amp plug as is (see attached) Would that make a difference?

Thanks for your thoughts!
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Last edited by nka; 01-28-2016 at 01:25 PM. Reason: additional info, attachment
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