The following may indicate that your vehicle is overheating:

l “ENGINE OVERHEAT” is shown on the multi-information display: The engine may be overheating.

“HYBRID SYSTEM OVERHEAT” is shown on the multi-information display:
A hybrid system component such as the power control unit or an electric motor (traction motor) may be overheating.

Follow the correction procedure as described below.

Correction procedures

If “ENGINE OVERHEAT” is shown on the multi-information display

1. Stop the vehicle in a safe place and turn off the air conditioning system.

2. Check to see if steam is coming out from the engine area.

If you see steam:
Stop the hybrid system. Carefully lift the hood after the steam subsides and then restart the hybrid system.

If you do not see steam: Leave the hybrid system operating and carefully lift the hood.

3. Remove the engine compartment cover.

4. Check to see if the cooling fans are operating.

If the fans are operating: Wait until the “ENGINE OVERHEAT” message disappears and then stop the hybrid system.

If the fans are not operating: Stop the hybrid system immediately and call your Lexus dealer.

After the hybrid system has cooled down sufficiently, check the engine coolant level and inspect the cooling system for leaks.

Add engine coolant if necessary.

Water can be used in an emergency if engine coolant is unavailable.

Have the vehicle inspected at the nearest Lexus dealer as soon as possible.

If “HYBRID SYSTEM OVERHEAT” is shown on the multi-information display

Stop the vehicle in a safe place and turn off the air conditioning system.

Ensure that the opening for the oil cooler is not blocked by dirt or any other foreign substance.If the opening is not blocked or if the message does not disappear after some time the opening has been cleaned, proceed to STEP 2.

Leave the hybrid system operating and carefully lift the hood.

Check if the cooling fans are operating.

If the fans are operating: Wait until the “HYBRID SYSTEM OVERHEAT” message disappears and then stop the hybrid system.

If the message does not disappear, call your Lexus dealer.

If the fans are not operating: Stop the hybrid system immediately and call your Lexus dealer.

After the hybrid system has cooled down, check the power control unit coolant level and inspect the cooling system for leaks.

Add power control unit coolant if necessary.

Water can be used in an emergency if power control unit coolant is unavailable.

Have the vehicle inspected at the nearest Lexus dealer as soon as possible.

Overheating

The following symptoms may occur when your vehicle is overheating: Hybrid system output decreases.

Steam comes out from the engine area.

CAUTION:
To prevent an accident or injury when inspecting under the hood of your vehicle
If steam is seen coming from under the hood, do not open the hood until the steam has subsided. The engine compartment may be very hot, causing serious injuries such as burns.

Check that the indicator on the “POWER” switch and the READY indicator are off.

For vehicles with a hybrid system, there are times when the gasoline engine automatically
starts to run or the cooling fans suddenly start to operate. Do not touch or approach the rotating parts of the belt or fans. Doing so may lead to fingers,
clothes or tools getting caught, resulting in injury.

Do not loosen the radiator cap while the hybrid system and radiator are hot.

Serious injuries, such as burns, may result from hot coolant and steam released under pressure.

NOTICE:
When adding engine/power control unit coolant Wait until the hybrid system has cooled down before adding engine/power control unit coolant.

When adding coolant, do so slowly. Adding cool coolant to a hot hybrid system too
quickly can cause damage to the hybrid system.