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Home >> Volvo >> 2003 >> S80 T-6 >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Control Modules - Design And Function - 3 Of 3 >> Upper Electronic Module (1999-2004) >> Diagnostic functions >> General information
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General information

The upper electronic module (UEM) has a built-in diagnostic system, the Volvo on-board diagnostic (OBD) system, which continuously monitors itself and the input and output signals.

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