RAC is the rear climate module, one of the 39 modules Ocean Live reads fault codes from with Faults→Scan all modules. The owner guide lists it as RAC (rear climate).
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.
- This module doesn't support a restart, so Ocean Live doesn't offer one. Clearing its codes is still possible.