Identification of poor charge balance
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.
With high specification vehicles with high load on the vehicle electrical system, the vehicle electrical system can be suppressed, particularly at excessively high ambient temperatures. The following reasons are possible:
- High power requirements for the electric fans from the heating and air conditioning system and the heat management system.
- Reduced performance of the alternator at high temperatures.
The APM monitors the charge balance continuously by integrating the battery current measured by the IBS. If a bad charge balance is detected, then take the following action:
- Idle speed increase.
- Reduce the class B electrical consumer (heating fan to 75% or 50%).
- Adaptation of the vehicle switch points with 8-gear automatic transmission 8HP90 to increase the engine speed measured.