2012 Lexus HS 250h Owners Manual - Page 27

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1-1. Hybrid system

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Charging the hybrid battery (traction battery)

As the gasoline engine charges the hybrid battery (traction battery), the battery

does not need to be charged from an outside source. However, if the vehicle is left

parked for a long time the hybrid battery will slowly discharge. For this reason, be

sure to drive the vehicle at least once every few months for at least 30 minutes or

10 miles (16 km). If the hybrid battery becomes fully discharged and you are unable

to jump-start the vehicle with the 12-volt battery, contact your Lexus dealer.

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Charging the 12-volt battery

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P. 549

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After the 12-volt battery has discharged or has been changed or removed

The gasoline engine may not stop even if the vehicle is running on the hybrid battery

(traction battery). If this continues for a few days, contact your Lexus dealer.

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Sounds and vibrations specific to a hybrid vehicle

There may be no engine sounds or vibration even though the vehicle is able to

move. For safety, apply the parking brake and make sure to shift the shift position to

P when parked.

The following sounds or vibrations may occur when the hybrid system is operating

and are not a malfunction:

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Motor sounds may be heard from the engine compartment.

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Sounds may be heard from the hybrid battery (traction battery) behind the rear

seats when the hybrid system starts or stops.

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Sounds from the hybrid system may be heard when the trunk lid is open.

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Sounds may be heard from the transaxle when the engine is started or stopped,

or while the engine is idling.

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Engine sounds may be heard when accelerating sharply.

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Sounds may be heard due to regenerative braking when the brake pedal is

depressed and accelerator is loosened.

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Other sounds, such as motors and mechanical noises, may be heard from the

brake system when the brake pedal is depressed.

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Vibration may be felt when the gasoline engine starts or stops.

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Cooling fan sounds may be heard from the air intake vent on the side of rear left

seatback.

When driving in Eco drive mode, the fan noise may be louder than when driving

normally.