CMRR_RL is the corner radar rear left module, one of the 39 modules Ocean Live reads fault codes from with Faults→Scan all modules. The owner guide lists it as CMRR_FL/FR/RL/RR (corner radars).
What the app can do
- Read its stored fault codes, and its software version and part number with Faults→Module versions→Read module versions (reading changes nothing).
- Clear codes for this module, only while parked safely. Share the report first: clearing erases the history a workshop would use.
- Ocean Live offers Restart for this module, only while the car is parked safely (see clearing codes and restarting). A restart is not a repair.