Try this as a temporary solution. It may not work in all cases.
- Get inside the car
- Turn on ignition to position II. All dash lights turn on.
- Allow at least five seconds for the Navigation to get all the juice from the battery.
- Now start the car and hope that the navigation turns on. It may take a couple of restarts, but it normally starts.
When you start the car, as soon as you turn the ignition on, there is a huge current draw from the battery that goes to the starter.
This draw put the CCC in a rebooting loop. By allowing the CCC to power up first, you have a better chance of getting it to turn on.
CCC Permanent Fix
To fix the Navigation problem at the dealer, you will spend anywhere between $1000 and $1600 on average.
A cheaper fix would be to use companies that specialize in BMW CCC Repair. Send them your CCC; they will fix it and send it back.