2007 Lexus GS 450h Owners Manual - Page 23

1-1. Hybrid system n Charging the battery l 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. l If the shift lever is in "N", the hybrid battery (traction battery) will not be charged. When driving in heavy traffic, operate the vehicle with the shift lever in "D" or "S" to avoid discharging the battery. n 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. 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 the engine compartment. l Sounds may be heard from the hybrid battery (traction battery) behind the rear seat when the hybrid system starts or stops. l Sounds from the hybrid system may be heard when the trunk lid is open. 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 from the regenerative brake when you press 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 Maintenance, repair, recycling, and disposal Contact your Lexus dealer regarding maintenance, repair, recycling and disposal. Do not dispose of the vehicle yourself. 4