Users always help a lot in solving those problems that we, for some reason, cannot detect. Most recently, Robert Nordgren – from Sweden – solved the problem of the quiet microphone of the OG 9-3. The issue was that during HandsFree conversations, he was heard very quietly.
The factory Saab microphone has two outputs, one low and one higher level channel. In the case of newer Saabs, in the TEL1 connector of the handsfree preparation, the amplified input is always connected. In all the vehicles we examined, we found it this way, so we thought this must be the standard connection. The BT Changer uses the amplified signal.
It turned out that in Robert’s 2000 OG 9-3 Aero, the TEL1 microphone wire was connected to the low-level branch of the microphone. That is, the signal arriving at the BT Changer was without amplification, so no wonder it was quiet.
The microphone outputs:
1 pin – Microphone input, high
2 pin – Microphone input, low
3 pin – Microphone ground
The solution is simple. The pin connected to pin 2 from the microphone connector must be moved to position 1. This requires some skill and possibly a pin removal tool, so it is advisable to turn to a professional.
I cannot say whether this low-level wiring also affects all older OG 9-3 models equipped with the blue 10-pin TEL1 connector. At present I have not found any information or description about this.
But one thing is certain: if you experience that the caller/called party hears your voice quietly, then the first thing to check is the microphone wiring.
Thank you for the tip, Robert, and thank you all for your help.
Note
The “quiet microphone” problem can occur not only in the OG 9-3 but also in the 9-5 and NG 9-3. The reason has not been solved yet. I thought that for some models, for example, NOKIA mobile phone preparation was made which does not require microphone amplification. So these models were manufactured with low signal level wiring.
The solution is the same as in the above case.