How to adjust volume using HFP module & IPhone
 

I have a 2005 E320 CDI Avantgarde Mercedes. I have just installed a HFP module and paired it with my IPod 3G phone. I find it difficult to hear the caller and cannot seem to raise the volume any higher (have used volume control on radio and steering wheel). Voice seems to come from a single speaker in the front somewhere, not all the speakers. Any ideas? Many thanks, Terry
terry@oakesvilla.co.uk