Programming and Relearning

Resetting low voltage counters

Resetting low voltage counters

Hint: The central electronic module (CEM) has integrated counters for the vehicle's voltage levels. Two counters store information - one counts how many times voltage is low while the other counts how many times voltage is so low that vehicle functions are deactivated. The voltage level of each counter depends on battery temperature and current consumption in the vehicle.
The counters are updated when voltage is low for more than approx. 2 minutes. The updated values can be read once they have been stored in the central electronic module (CEM). This is done after the ignition has been switched off and the key removed for approx. 30 minutes.
Deactivated functions can include the ventilation fan and the infotainment system. For more information see "Design and Function, Central Electronic Module (CEM)".
Functions are automatically deactivated in order to ensure that there is sufficient battery output to start the vehicle. A text message appears in the display when voltage is low.

Caution! The counters should only be reset when the battery is being replaced or has recently been replaced.




- Ignition on.
Read and reset the counters by clicking the VCT2000 symbol.

Hint: If a customer complains that the text message for low voltage is displayed often or that the infotainment system, for example, switches off, reading these counters could serve to confirm this and indicate how many times it has happened.









Continue - DONE

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