50 4Ever

Thanks for the response. We had to find a happy mediun. They found better grounds and that got 90% of the noise out. Now with the gain back up I can hear the NAV directions, buletoohn & onstar. I don't know what kind of interface they used but they said they have never had a problem with them. I think the main problem was finding a good ground, which is hard to do on a plastic car.... Have a great day

I noticed that NO doesn't have "flow and incident enabled roads" listed like most other coverage areas do, I wonder if that could contribute to the problem?

Hi Guys, After I picked my car up from the shop where I had my Z2 installed there was an annoying engine noise. Sounds almost like alternator noise to me, high piched hum that changes with engine RPM. I took it back the next day and they fussed with it for several hours trying "everything" and the noise was gone. They "turned down the gain on the interface box". Now I can't hear the bluetooth or the NAV TBT instructions (they are turned up all the way on the AV/Syatrm Settings screen). Any one out there had a similar problem and what was the solution? Thanks in advance.