Had my Z2 stolen from my truck and purchased a refurbished Z2 as a replacement. I had a different installer who also installed an alarm system with remote start. The navigation isn't working either. Now that you have some background, he put in the bypass but in the connection status, I get:
GPS: ok, but no satellites
Emergency brake: On when it isn't
in the vehicle dynamics screen speed and rpm are unavailable.
I'm thinking a problem with VSS wire, Any suggestions?