I have a BMW 730d with the gps unit in the trunk. And one big circular button in the central console.
Two question 1. What type of system ? VDO Dayton non C-IQ ? like renault CNI1.
2. I remove from the unit one original disk "Digital Road Map Germany 2003-1" and i do this manually because the disc is bloqued inside.
But when i reconnect all the system same message "insert disc map" and i check the disc in the unit on the rear don't start.
It's like Renault CNI1 with bad update ?
Ok i find it's a VDO Dayton unit, i open the unit and it's 100 % exactly the same cd reader like Renault CN1 with 9 cd system.
Not a DVD sytem. (on the unit "Navigation System" 2 led: 1=ON 2=CD IN)
I'm think the unit have a electric problem with the reader.
And i start to be sure this use the same Map cd for "VDO Dayton non C-IQ"