Tiger706

Hi, I seem to have a problem with the reception quality to the other party while using the bluetooth. I can hear the caller clearly, however the caller can only hear me faintly. Any ideas how to rectify this? The lexus dealer initially insisted that it is not an issue with the blue tooth and then later mentioned that this system is connected with other things in the car so it is advisable not to tamper with it? Please let me have your views on how to rectify this problem. Cheers Tiger.