2003 Lexus LS 430 Owners Manual - Page 293

STARTING AND DRIVING You may hear a sound in the engine compartment for a few seconds when the engine is started or just after the vehicle begins to move. This means that the vehicle stability control is in the self−check mode and does not indicate a malfunction. Vehicle stability control failure warning 31L140d 31L139a If the vehicle stability control system or the traction control system malfunctions, the master warning light and "VSC OFF" indicator light come on. At this time the warning message appears in the multi −information display. And the warning tone sounds. If the message appears, the vehicle stability control system and traction control system do not work. Although it is no problem to continue driving, have your vehicle checked by Lexus dealer as soon as possible. You can turn off the vehicle stability control system by pushing the "VSC OFF" switch. The "VSC OFF" indicator comes on. At this time, the traction control system also turns off. You cannot turn off either one of them. Pushing the "VSC OFF" switch a second time turns the system back on and extinguishes the "VSC OFF" indicator light. When you turn the ignition switch on, this system always turns on. 279