Mazda 2 2015 Owner's Manual page 186

Glow Indicator Light
(SKYACTIV-D 1.5)
This light may illuminate when the
ignition is switched ON.
It turns off when the glow plugs are warm.
If the ignition is left switched ON for a
long period of time without the engine
running after the glow plugs are warmed
up, the glow plugs may warm up again
which will illuminate the glow indicator
light.
Instrument Cluster and Display
When Driving
4–43