G,day, I have just fitted a hard wired car kit Model HFLGTU500, everything is working except my speaker & microphone. The yellow wire for the radio mute is the only thing I did'nt hook up, would this be the cause of the problem?
The microphone socket is very tight. Ensure the microphone plug is pushed in completely on the handsfree Control Unit.
There is a small cable and plug inserted into the top of the handset carrier. This is only a plug holder. The speaker will only work when this plug is plugged into the earphone socket on the side of the handset.
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Your phone's microphone is not working and so it must be checked. See that the is no block to the microphone pores-- the small hole for the voice to be taken to the mic.
IF so use a hands-free to check if the circuit is working. If so the phone has no issue except a fault in the microphone or a connection fault in the hands-free.
You need to remove to check and must attempt only if you are confident.
I found a solution but not a final one, during the call turn on the hand's free speaker and the microphone will work fine, you can set the hadsfree speaker to the minimal output so you can use it as the regular ear speaker and the microphone will continue to work well.
A problem with the internal microphone, or the contact between it and the circuit board, more often on the later, cause a condenser microphone is quite rugged. Anyway, it really needs professional attention, but if you're adventurous enough all you need is a T5 or T6 screw driver to open. Clean it, but don't use any liquid. Again, it's a delicate job, better handled by professional on that field. You might end up losing your phone altogether.