Yamaha NAVIGO Owner's Manual page 58

TIP If the power does not turn on
Is the power for the controller turned on?
If the power for the controller is turned on, the power for the assistant controller will not turn on.
In this case, turn off the power switches on both controllers, and turn on the power for the assistant
controller.
The battery residual capacity lamp does not turn on
TIP
If the warning lamp is lit or flashing, it means that the battery has run out.
If the warning lamp turns on immediately after replacing the battery with
a fully charged battery, and the wheelchair does not move, there may be
a malfunction in the unit.
Contact your dealer.
If the buzzer sounds and the wheelchair does not move
TIP
Are you pushing the operation button with one or both of the left and right clutch levers in the manu-
al position?
This is a buzzer to warn you that the clutch has been disengaged. (Beeps "Pi Pi, Pi Pi, Pi Pi")
Turn the power off, switch both of the left and right clutch levers to power drive position, and turn the
power back on.
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On or flashing