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Diagnostic Functions (B4204T3; 2004): Overview: General

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: DSA Control Module
GLL116217Courtesy of VOLVO CARS OF NORTH AMERICA.

The DSA control module has an integrated diagnostic system, the Volvo on-board diagnostic (OBD) system. This system continuously monitors itself and the input and output signals.

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