Auto Start/Stop (MSA) And Power Management: Battery

For vehicles with automatic engine start-stop, an AGM battery  must be fitted in all cases and it must be registered after battery replacement using the service function < Register battery replacement > so that the MSA function can work perfectly. In the event of a battery replacement, disconnection of the battery or after programming the engine management system, the reference data for the battery charge state and battery condition can be lost.

They are only available again after an open-circuit voltage measurement of approx. 6 hours (e.g. off-load phase overnight) in which the vehicle may not be wakened. In this training period, the MSA function is not active (shutdown inhibitor = battery charge state not plausible). The customer is to be notified of this when the vehicle is handed over. The MSA function switches back automatically to active as soon as the necessary routines have been completed successfully.