I was installing the wireless CarPlay from Road Top when I ran into problems. After getting it installed, I started it up and had a black comand display. I removed everything and put it back to stock and still have a black comand display. When I run the Star diagnostics, it confirms that it cannot communicate with comand. The radio works (cannot see the tuner of course), Star diag has a number of errors related to the comand, including microphone 1 and 2 not working, display not working, and comand controller now working. I have tried:

Removing fuse 11 for a couple of minutes
Inspecting all of the connectors for bent pins
Disconnecting the batteries for 3-4 hours
Charging the batteries
Clearing all codes with Star

It is almost like there is a wire harness that I did not reconnect. I did not take a picture of the back of the radio before disconnecting it so I don't know for sure if something is missing. I have searched through the comand mount area and not found an harnesses that are not connected.

Any help on where to troubleshoot next would be appreciated.

 

im having the exact same issue for the same reason did you find a fix yet???

 

@toones , have you completely removed the unit to confirm it's not a glitch in your comand that is actually causing this? I don't see this step in your troubleshooting steps.

I connected three of these boxes and every time I got myself wondering why I end up with black screen - it's always the ldvi connection that I somehow manage to mess up (it's unnatural to me the way they ask you to connect it). So this was 3 out of 3 cases I had with the box... One time was because of the wrong dip switches setup (with Roadtop's unit it's 3.6.8 ON).

 

@amgs63dxb , Thank you very much for your response. I have completely remove the Roadtop system from the car and still have no command screen display. I took it to MB and they checked the basics (fuses), but wanted a little over $700 to continue diagnosing (removing the dash, etc.). The MB hourly rate here in SoCal is $220/hour, so I stopped them and will continue to try and diagnose myself.

I have gone through some of the Xentry diagnostics, checking for power at the display and Comand. All good.

I am just not sure what/where to check next. I was thinking of picking up a display on Ebay and trying that, but I don't know if the displays are required to be adapted.

 

Thank you very much for your response. I have completely remove the Roadtop system from the car and still have no command screen display. I took it to MB and they checked the basics (fuses), but wanted a little over $700 to continue diagnosing (removing the dash, etc.). The MB hourly rate here in SoCal is $220/hour, so I stopped them and will continue to try and diagnose myself.

I have gone through some of the Xentry diagnostics, checking for power at the display and Comand. All good.

I am just not sure what/where to check next. I was thinking of picking up a display on Ebay and trying that, but I don't know if the displays are required to be adapted.