Yamaha PASC4 Owner's Manual page 79

Assist mode indicator
Pu
Depends on the assist mode at that
time.
Pu
Purple
Walk assist
When you are on or off the bicycle and start moving it, you
can use walk assist without pedaling the bicycle.
Walk assist will not work in the following situations:
When you release the assist mode switch (down).
If you press another switch at the same time.
When you start to pedal.
If your bicycle speed exceeds 3.6 mph (6 km/h).
If you select Off Mode.
If the wheels are not turning (when braking or coming
into contact with an obstacle, etc.).
1. Change to any other assist mode than the Off Mode.
2. When you press the select button, the rightmost lamp
of the assist mode indicator will light up in purple for 2
seconds.
When left for 2 seconds without doing anything or if
you press any other switch than the select button or as-
sist mode switch (down), it will return to the original
state.
3. By holding the assist mode switch (down) pressed
while the rightmost lamp of the assist mode indicator
lights up in purple, the walk assist function is usable.
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