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I'm suffering a random issue with my head unit.
Sometimes it starts rebooting after showing "COMMAND Disconnecting" (in spanish), and repeat the cycle maybe after some seconds, maybe after some minutes. When this happens it can also show "Anti-theft protection active. Go to your Mercedes Workshop" message for some seconds. Or just shut off and stay off for some minutes. Or sometimes even, show the small clock on the corner (like when you manually shut it down) but while it continues to play music.
Other times, it just not fail and it works for the long of the journey.
I know when this failure is going to happen because the icon of the Speed Limit Assistant on the instrument cluster dissappears. Those times i know it will be resetting until i stop the car. And the next day will be a lottery. If i have the icon on the dash, everything will work as expected, if not... COMMAND Disconecting.
I can also know when it's going to fail because those times, under "audio" menu on the instrument cluster, it shows " - - - - ", as its not able to talk with the head unit. Volume controls work, but direction arrows do not.
(image taken from the internet, not my cluster)
After experiencing all this, i decided to plug my C4 to the car and do a quick check in Xentry. It showed the following (among other similar errors on the Instrument Cluster saying its unable to communicate with Central Gateway, and the same on the ZCW central gateway):
Could this all be related to a broken (sometimes) MOST ring?
Any advise on how to proceed to troubleshoot this?
N93 - Central gateway (CGW [ZGW]), is not showing any error.
But all the following CAN related messages showed:
A40/11 - Multifunction camera (mono) (MFK):
- C14687 Communication with the central gateway has a malfunction.
N62/2 - Radar sensors control unit (SGR):
- 680100 CAN communication with component 'B29/6 (Left rear bumper radar sensor)' has a malfunction.
- 630100 CAN communication with component 'B29/3 (Right front bumper DISTRONIC (DTR) sensor)' has a malfunction.
- 680800 CAN communication with component 'B29/6 (Left rear bumper radar sensor)' has a malfunction.
- 630800 CAN communication with component 'B29/3 (Right front bumper DISTRONIC (DTR) sensor)' has a malfunction
N30/7 - N30/7 (Electronic Stability Program Premium control unit)(ESP®):
- 620800 The CAN message from control unit 'CGW [ZGW]' is faulty.
A40/9 - Operating unit of control unit 'Audio or COMAND' (COU [ZBE]):
- C15500 Communication with the instrument cluster has a malfunction.
A40/8 - Audio/COMAND display (ZAN):
- C155 Communication with the instrument cluster has a malfunction.
A40/3 - COMAND Online (Head unit):
- C146 Communication with the central gateway has a malfunction.
- C168 Communication with the electronic ignition lock has a malfunction.
A1 - Instrument cluster (IC)
- U014787 Communication with the control unit 'Head unit' has a malfunction. The message is missing.
Maybe my central gateway is failling? or maybe a real cabling failure?
Do someone see any common point of failure on the listed systems?
Do someone have a schematic were all thoses systems were shown in order to find where a failing cable could be?
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