I recently had a Parrot bluetooth kit fitted and the installer couldn't get the telephone mute pin to work on my system.

Am thinking I will try testing the corresponding pin from your pin guide. Any idea when the change over for radios was during 2002? (I will count the number also.)

For testing: presumably the radio needs a 12V positivie signal pulse to activate the mute function. Can anybody confirm this? And what is the telephone ON pin for? Stupid question probably.

Thanks a million!