Toyota Prius Owner's Manual page 238

2-2. Instrument cluster

Warning lights
Warning lights inform the driver of malfunctions in any of the
vehicle's systems. (P. 499)
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*
*
1
: These lights turn on when the "POWER" switch is turned to ON
mode to indicate that a system check is being performed. They will
turn off after the hybrid system is on, or after a few seconds. There
may be a malfunction in a system if a light does not come on, or if
the lights do not turn off. Have the vehicle inspected by any autho-
rized Toyota dealer or repairer, or another duly qualified and
equipped professional.
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2
: The light flashes to indicate a malfunction.
238
PRIUS_OM_OM47A19E_(EE)
* *
1 1 1
(red)
1 * 1 * 1, 2
(if equipped)
* * *
1 1 1
(yellow) (if equipped)
* 1 * 1 * 1
*
1