Toyota Prius 2010 User Manual page 545

5-2. Steps to take in an emergency
■
If "HYBRID SYSTEM OVERHEAT" is shown on the multi-infor-
mation display
STEP 1
Stop the vehicle in a safe place and turn off the air condition-
ing system.
STEP 2
Leave the hybrid system operating and carefully lift the hood.
STEP 3
Check if the cooling fans are operating.
If the fans are operating:
Wait until "HYBRID SYSTEM OVERHEAT" disappears and
then stop the hybrid system.
If the message does not disappear, call your Toyota dealer.
If the fans are not operating:
Stop the hybrid system immediately and call your Toyota
dealer.
STEP 4
550
After the hybrid system has
cooled down, check the power
control unit coolant level and
inspect the cooling system for
leaks.