2009 Lexus LS 600h Owners Manual - Page 31

1-1. Hybrid system l To help prevent the 12-volt battery from becoming discharged, drive the vehicle at least once a month, and operate the accessories only when the "READY" indicator is on. When parking the vehicle, make sure the doors and trunk are closed and all lights are turned off. n After the 12-volt battery has discharged or has been changed or removed The gasoline engine may idle at times when it usually would not. The vehicle idles continuously in order to re-learn the engine operating conditions and this does not indicate a malfunction. If this continues for more than a few days, contact your Lexus dealer. n Sounds and vibrations specific to a hybrid vehicle There may be no engine sounds or vibration even though the vehicle is able to move. Always put the shift lever in "P" when parked. The following sounds or vibrations may occur when the hybrid system is operating, and are not a malfunction: l Motor sounds may be heard from under the vehicle. l Sounds may be heard from the hybrid battery (traction battery) behind the rear seat when the hybrid system starts or stops. l Sounds may be heard from the transmission when the hybrid system starts or stops. l Engine sounds may be heard when accelerating sharply. l Sounds may be heard due to energy regeneration when you depress the brake pedal. l Vibration may be felt when the gasoline engine starts or stops. l You may hear cooling fan sounds coming from the air intake vents behind the rear seat. n Hybrid battery (traction battery) cooling The air conditioning system may operate automatically to cool the hybrid battery (traction battery). n Maintenance, repair, recycling, and disposal Contact your Lexus dealer regarding maintenance, repair, recycling and disposal. Do not dispose of the vehicle yourself. 32