2009 Toyota Highlander Owners Manual - Page 560

5-2. Steps to take in an emergency n If "Hybrid System Overheat" is shown on the multi-information display STEP 1 Stop the vehicle in a safe place and turn off the air conditioning system. Leave the hybrid system operating and carefully lift the hood. 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 2 STEP 3 STEP 4 After the hybrid system has cooled down, check the power control unit coolant level and inspect the cooling system for leaks. Power control unit coolant reservoir Power control unit coolant radiator STEP 5 If necessary, add power control unit coolant up to the "FULL" line. Water can be used in an emergency if power control unit coolant is unavailable. (→P. 543) Have the vehicle inspected at your nearest Toyota dealer as soon as possible. 534