TOYOTA 2011 Prius - Manual (Page 542)

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5-2. Steps to take in an emergency
PRIUS_U (OM47685U) DVD
Warning message Details
(Flashes)
(If equipped)
Indicates a malfunction in the radar cruise control sys-
tem.
A buzzer also sounds.
Press the “ON-OFF” button once to deactivate the
system, and then press the button again to reacti-
vate the system.