https://freesker.armeniansolutions.com/ Sun, 16 Aug 2026 17:52:26 +0000 MyBB https://freesker.armeniansolutions.com/thread-53.html Sun, 26 Jul 2026 16:50:44 +0200 secretname@gmx.de]]> https://freesker.armeniansolutions.com/thread-53.html Dear Freesker Support, or any other expert on the radar system:

can you help on this error code C21A909 for the Radar Module -Front center (MRR)???

It appeared after a front window replacement - and since caused issues (=fully down) of front collission assitant, lane assist, traffic light status indication

DTC report after my recent FCM calibration attached: ECU resets of FCM+Hydra+MRR, finished with a deep sleep . Software versions as well (MRR doesn't show up there)

Is it rather
a) a calibration issue?
or
b) a connection issue of wires/plugs (e.g. water in a plug; or simply plug was disconnected in a repair, but not properly reconnected)?
or
c) even a module hardware failure?
or maybe something completely different?

The interesting thing is that after calibrating the FCM with Freesker tool, the front collission assistant (including braking in close situtations), the lane assist, the traffic light status indicator started working again - so I was wondering how a front collission assistant incl braking could work without the Front center radar module, i.e. I think this module does work actually.

Nevertheless, these warning symbols keep on shining, and the error code  C21A909 still remains :-(

Any hint and recommendation what to do next?
Thank you so much in advance!

  20260726 report (6) after ECU Reset FCM, Hydra, MRR and Deep Sleep.pdf (Size: 28,58 KB / Downloads: 2)

  error symbols.jpg (Size: 114,9 KB / Downloads: 3)

  Screenshot_20260726-143719_Chrome.jpg (Size: 315,67 KB / Downloads: 5)

  Screenshot_20260726-143736_Chrome.jpg (Size: 317,08 KB / Downloads: 3)

  Screenshot_20260726-144115_Chrome.jpg (Size: 368,97 KB / Downloads: 3) ]]> Dear Freesker Support, or any other expert on the radar system:

can you help on this error code C21A909 for the Radar Module -Front center (MRR)???

It appeared after a front window replacement - and since caused issues (=fully down) of front collission assitant, lane assist, traffic light status indication

DTC report after my recent FCM calibration attached: ECU resets of FCM+Hydra+MRR, finished with a deep sleep . Software versions as well (MRR doesn't show up there)

Is it rather
a) a calibration issue?
or
b) a connection issue of wires/plugs (e.g. water in a plug; or simply plug was disconnected in a repair, but not properly reconnected)?
or
c) even a module hardware failure?
or maybe something completely different?

The interesting thing is that after calibrating the FCM with Freesker tool, the front collission assistant (including braking in close situtations), the lane assist, the traffic light status indicator started working again - so I was wondering how a front collission assistant incl braking could work without the Front center radar module, i.e. I think this module does work actually.

Nevertheless, these warning symbols keep on shining, and the error code  C21A909 still remains :-(

Any hint and recommendation what to do next?
Thank you so much in advance!

  20260726 report (6) after ECU Reset FCM, Hydra, MRR and Deep Sleep.pdf (Size: 28,58 KB / Downloads: 2)

  error symbols.jpg (Size: 114,9 KB / Downloads: 3)

  Screenshot_20260726-143719_Chrome.jpg (Size: 315,67 KB / Downloads: 5)

  Screenshot_20260726-143736_Chrome.jpg (Size: 317,08 KB / Downloads: 3)

  Screenshot_20260726-144115_Chrome.jpg (Size: 368,97 KB / Downloads: 3) ]]> https://freesker.armeniansolutions.com/thread-41.html Sun, 01 Feb 2026 14:26:44 +0100 Floris76]]> https://freesker.armeniansolutions.com/thread-41.html

My FO keeps showing the same faults again and again after a reset: CMRR RL and CMRR RR, specifically MRR Online Calibration Error (DTC C228E00). 
Unfortunately, I can’t calibrate the CMRR/CMRR because this function is not enabled/activated in my system.

In addition, while driving, the yellow blind-spot warning indicators in the driver display keep lighting up repeatedly. 
This is very distracting and especially bothersome at night during driving. 

Please help me resolve this issue.]]>

My FO keeps showing the same faults again and again after a reset: CMRR RL and CMRR RR, specifically MRR Online Calibration Error (DTC C228E00). 
Unfortunately, I can’t calibrate the CMRR/CMRR because this function is not enabled/activated in my system.

In addition, while driving, the yellow blind-spot warning indicators in the driver display keep lighting up repeatedly. 
This is very distracting and especially bothersome at night during driving. 

Please help me resolve this issue.]]> https://freesker.armeniansolutions.com/thread-25.html Tue, 25 Nov 2025 16:30:30 +0100 Pauly]]> https://freesker.armeniansolutions.com/thread-25.html
  WhatsApp Bild 2025-11-25 um 16.24.08_62aa39c0.jpg (Size: 65,94 KB / Downloads: 27) ]]>
  WhatsApp Bild 2025-11-25 um 16.24.08_62aa39c0.jpg (Size: 65,94 KB / Downloads: 27) ]]>