User Manual

54
Battery Management System (BMS) Service
The Battery Management System (BMS) 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 vary by vehicle,
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, as the existing battery. 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 of 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 displays the mileage reading when the last battery was
replaced, registers the battery replacement after replacing a new battery
and informing the power management system that a new battery has
been installed.
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 vehicle or limit the functionality of vehicle’s
electrical systems.
Using the BMW as an example.
 To register the battery exchange