In 90% of the cases followed and with Comfort Access (CA) installed it’s usually related to a shorted Door Handle. System may still work fine however.
The CA is installed on the same Circuit as DSC which is a 5 Amp Fuse in the Glovebox position #2. Sometimes the Fuse blows and sometimes not creating just a current draw.
- Check that Fuse
- Charge the Battery using a AGM Charger at the proper points under the Hood (do not remove or charge in the Trunk !
- Clear all codes and monitor