Lexus RX450H Manual page 317

2-4. Using other driving systems

PCS (Pre-Crash Safety system) (if equipped)
P. 301

Emergency brake signal
In order to reduce the risk of a rear-end collision, when the brakes
are applied suddenly the stop lights will automatically flash to alert
the vehicle behind
When the VSC/TRC systems are operating
294
RX450h_EE
If the vehicle is in danger of
slipping or if any of the drive
wheels spins, the slip indicator
flashes to indicate that the
VSC/TRC systems are operat-
ing.