2004 Lexus LS 430 User Guide 2 - Page 51

KEYS AND DOORS Battery power saving When doors are locked, the smart key system transmits electromagnetic waves to the outside of the vehicle at regular intervals. For this reason, the vehicle battery will be discharged if the vehicle is left for a long time. If the key is left within the effective range of the smart key system outside of the vehicle, the key and the vehicle transmit electromagnetic waves periodically. If these conditions continue for a long time, the battery in the key and vehicle will be discharged and from the sixth day, smart unlocking operations will become slow. To prevent the batteries from being discharged, the smart key system is automatically deactivated in the following conditions: D If there is no smart door locking operation for more than 14 days D If the key is left within the effective range of the smart key system outside of the vehicle for more than 10 minutes To reactivate the smart key system properly, perform any of the following: (a) Press the lock button on the outside door handle while carrying the smart key. (b) Perform a wireless remote control operation. (c) Insert and turn the key in the keyhole of the door. INFORMATION D To maintain communication with the vehicle, smart keys (including master keys) use built-in battery power. The battery service life is about 1 to 3 years on average. If battery power becomes insufficient, replace the battery with a new one. D The smart key continually receives electromagnetic waves, and if it receives strong electromagnetic waves over a period of time, the battery can be drastically run down. Therefore, avoid storing smart keys near any electrical appliances. Here is a list of electrical appliances which may have adverse effects on the smart key performance: TVs, personal computers, cellular phone or cordless phone recharger units, electric light stands and fluorescent desk lights Note that you should always keep such electrical appliances at least 1 m (3 ft.) away from the smart key. 33