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67
BMS
The BMS (Battery Management System) allows the scan tool to evaluate the
battery charge state, monitor the close-circuit current, register the battery
replacement, and activate the rest state of the vehicle.
NOTE
1. This function is not supported by all vehicles. The screens shown in this
section are examples.
2. The sub functions and actual test screens of the BMS may vary for
different test vehicles, please follow the on-screen instructions to make
correct option selection.
The vehicle may use either a sealed lead-acid battery or an AGM (Absorbed
Glass Mat) battery. Lead acid battery contains liquid sulphuric acid and can
spill when overturned. AGM battery (known as VRLA battery, valve regulated
lead acid) also contains sulphuric acid, but the acid is contained in glass mats
between terminal plates.
It is recommended that the replacement aftermarket battery has the same
specifications, such as capacity and type, with the battery used in the vehicle.
If the original battery is replaced with a different type of battery (e.g. a lead-
acid battery is replaced with an AGM battery) or a battery with a different
capacity (mAh), the vehicle may require reprogramming the new battery type
in addition to performing the battery reset. Consult the vehicle manual for
additional vehicle-specific information.
Register Battery Replacement
This option allows displaying the mileage reading of last battery replacement,
registering the battery replacement after replacing a new battery and
informing the power management system that a new battery has been fitted
to the vehicle.
If the battery change is not registered, the power management system will
not function properly, which may not provide the battery with enough charging
power to operate the car and limit the functions of individual electrical
equipment.
Take BMW as an example.
To display the battery history
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