Yamaha PASC4 Owner's Manual page 120

Symptom
(Down Tube Battery)
(Multi Location Battery)
(External Crossover Battery)
Check
Remove the Battery Pack
from the bicycle.
Then connect the charging
plug into the Battery Pack.
(If battery capacity
indicator lamps still flash
alternatively, there might
There is a
be a fault in the Battery
contact fault in
Pack).
the contact
When the Battery Pack is
terminals.
remounted on the bicycle
and the power switch of
the Display Unit is pressed,
if battery capacity indicator
lamps still flash alternately,
there might be a fault in the
Drive Unit.
116
Action