V50 AWD L5-2.5L Turbo VIN 68 B5254T3 (2005)
The engine control module (ECM) (4/46) regulates the alternator charging voltage (via LIN communication) in response to a request from the central
electronic module (CEM) (4/56) (via CAN communication).
The engine control module (ECM) can change the requested charging voltage from the central electronic module (CEM) in order to adapt it to certain
operating conditions such as starting, idling or high engine loads.
The value requested by the engine control module (ECM) for charging voltage and alternator charging current can be read using VIDA.
The alternator control module (ACM) sends fault information to the engine control module (ECM). Diagnostic trouble codes are stored in the engine
control module (ECM).
For additional information on regulating the alternator, see Design and Function, Alternator and Design and Function, central electronic module (CEM).
