Re: Can't hear callers on Sony MEX-BT3900u

noreplyforum@eu.sony.com — Fri, 15 Jun 2012 22:28:19 GMT

also found this post on fixya forum

Eureka!!!!! The problem is solved and fixed. This fix will work for any Sony MEX BT head unit / stereo (MEX BT2500, BT2600, BT3700, BT3700, BT5700) with a "no sound" through speakers during a call on bluetooth problem, or, no sound on any source except tuner issue, or, can only hear calls when on tuner, or, can only hear streaming when AF/TA is on

1. Find the blue and white striped wire (which is probably hanging loose in your connectors from the ISO block in the back of your head unit and likely has a female, round spade cap on it) which is the "AMP REM" wire

2. Cut off the spade cap, expose about 5mm of wire and twist it

3. Now run it back into the other blue wire coming from the same ISO block in the back of your head unit - the "Power Antenna" wire. You are temporarily shorting/connecting both wires to test your fix

4. If you now try to make a call by bluetooth whilst streaming music, or, on any other source on the head unit - IT WILL WORK

5. Now permanently splice the two blue wires together and put insulating tape over the join

NOTE: The blue wire I am talking about is NOT the light blue ATT wire which is probably also hanging loose

The reason for the problem in the first place was that your head unit was only correctly activating the amp on tuner through the power antenna lead - now any function/interrupt powers the amp as you have connected the remote amp to the antenna wire.

will try this........

Re: Can't hear callers on Sony MEX-BT3900u

noreplyforum@eu.sony.com — Fri, 15 Jun 2012 22:22:23 GMT

hi da_yo

can you explain in more detail as i have same problem, i cannot hear any sound from speakers when making bluetooth calls unless i am in the tuner source. if i am listening to tuner then i can hear calls from my phone however on any other source nothing comes out of speaker when making calls :-(

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Re: Can't hear callers on Sony MEX-BT3900u

Re: Can't hear callers on Sony MEX-BT3900u