PIAGGIO MP3 Hybrid Manual page 25

The helmet compartment must be removed to access to the batteries.
The BMS acts as insulation between the 12 V ground (services) and the 37 V ground
(traction)
To arm the traction battery (37V), press and hold the button for approximately 1
second. This procedure must be performed with the ignition key ON to prevent the
battery from being used before it is manually activated.
The switch has two LEDs: the red LED flashes when the battery is disarmed, the green
LED flashes when the battery is armed.
At key ON, the Kuadro (EMD) generates a 12V start-up signal and sends it to the BMS.
Before sending this signal (a few ms after key on), the Kuadro (EMD) absorbs
approximately 30 W to power its logic circuits.
The button is a Mosfet switch driven by a command from the BMS.
A voltage limiter is installed between the power terminals to prevent voltage spikes
when the switch opens the circuit.
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