2005 Lexus LS 430 Owners Manual - Page 402

STARTING AND DRIVING TRACTION CONTROL SYSTEM The traction control system automatically helps prevent the spinning of rear wheels when the vehicle is started or accelerated on slippery road surfaces. When the ignition switch is turned to "ON", the system automatically turns on. 31L138a CAUTION Under certain slippery road conditions, full traction of the vehicle and power against rear wheels cannot be maintained, even though the traction control system is in operation. Do not drive the vehicle under any speed or maneuvering conditions which may cause the vehicle to lose traction control. In situations where the road surface is covered with ice or snow, your vehicle should be fitted with snow tires or tire chains. Always drive at an appropriate and cautious speed for the present road conditions. "Slip indicator light Leave the system on during the ordinary driving so that it can operate when needed. You may hear a sound in the engine compartment for a few seconds just after the vehicle begins to move. This means that the traction control system is in the self−check mode, but does not indicate a malfunction. When the traction control system is operating, the following conditions occur: D The system controls the spinning of the rear wheels. At this time, the slip indicator light blinks. D You may feel vibration or noise in your vehicle, caused by operation of the brakes. This indicates the system is functioning properly. The slip indicator light comes on for a few seconds when the ignition switch is turned to "ON". If the indicator light does not come on when the ignition is turned on, contact your Lexus dealer. 363