Diagnostic functions: General
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The central electronic module (CEM) is the master unit for the immobilizer. The central electronic module (CEM) also directly stores diagnostic trouble codes (DTCs) for faults in the immobilizer system. Some other faults can also be stored in the engine control module (ECM). For information about diagnostic functions, see VIDA Design and Function, central electronic module (CEM), and Design and Function, engine control module (ECM).