Full Product Manual

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.

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 display the battery history