In addition to the actual battery change, we also recommend maintaining the voltage during extensive troubleshooting. When the engine is switched off, power is still drawn from the battery during vehicle diagnostics. In the case of a longer diagnosis, the battery installed in the vehicle can be discharged by the control units and other electrical loads to such an extent that the on-board system voltage falls below the permissible under-voltage limit of the control units and a corresponding entry is made in the fault memory and data is lost in the volatile memory section (e.g. steering angle sensor or end positions of the electric window lifters).
A constant voltage of the vehicle electrical system is therefore a prerequisite for professional troubleshooting or battery replacement and to avoid additional difficulties from the outset due to any undervoltage
What is voltage stabilization?
Voltage stabilization describes the process of connecting an external power supply in order to maintain the voltage in the vehicle at a constant level when the battery is disconnected. This prevents the control units in the vehicle from registering a critical undervoltage and recording this as a fault in the event record.