July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Central Electronic Module (CEM) (2007-2013): Function: Alternator

Fig 1: Identifying Alternator Control Module (ACM), Engine Control Module (ECM) And Central Electronic Module (CEM) Communication

Courtesy of VOLVO CARS CORPORATION

See appropriate service information regarding Generator (GEN) and Engine control module (ECM).