Toyota prius Owner's Manual page 317

 Hill-start assist control
P. 321
 PCS (Pre-Crash Safety System) (if equipped)
P. 324
 Emergency brake signal (if equipped)
When the brakes are applied suddenly, the stop lights automati-
cally flash to alert the vehicle behind.
When the TRC/VSC/ABS systems are operating
PRIUS_OM_OM47871E_(EE)
2-4. Using other driving systems
The slip indicator light will flash
while the TRC/VSC/ABS sys-
tems are operating.
2
317