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Old 06-28-2003, 03:20 AM   #1
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Join Date: May 2003
Location: SF Bay Area
Posts: 34
My Ride: '03 Steel Grey 325ci
AUX input kills stereo?

Following the circuit diagram provided in the aux input retrofit instructions, I made my own cable. When I tried using my cable, it successfully allowed me to select AUX and there was sound, but the music is definitely a monaural sound.

Has anyone with the OEM aux input experienced this? Do you still hear stereo?

I have a song that has a sound moving from left to right which can test this. On my cable, the sound goes quiet at the point where the music goes from left to right.

I followed the circuit diagram exactly. The only thing I may have done wrong is misinterpreting the stereo connector end. Could someone confirm this?

I have it as:
pin 3 = tip of stereo jack
pin 2 = middle of stereo jack
pin 1 = base of stereo jack
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Old 06-29-2003, 06:45 PM   #2
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Join Date: Jun 2003
Location: Maryland
Posts: 41
My Ride: 2003 330ci
I made my own cable as well. For an 03 w/out nav the 1/8" plug was the tip is audio left, ring is audio right, and the base is common. As far as the pins on the head unit, 4 is common, 8 is audio right, and 9 is audio left. Don't forget the 300k resistor between the L & R signal and the .22uF caps in line with the audio signals. Hope this helps.
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Old 06-30-2003, 02:11 AM   #3
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Join Date: Aug 2002
Location: Palo Alto, CA
Posts: 35
My Ride: SG03M3
I have a bunch of test MP3s (phase, stereo, etc.) that I used when installing my homemade aux cable, and it definitely works fine. The resistor (which provides the aux sense) is across the left and right wires, so the cable sounds fine from the resistor to the car, but you must have a problem with your cable somewhere from the resistor to your audio source.
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