2003 Toyota 4Runner Owners Manual - Page 1241

'03 4Runner_U (L/O 0305) Four-wheel drive system (multi-mode four-wheel drive models)- (a) Multi-mode control Use the center differential lock system if your wheels get stuck in a ditch, or when you are driving on a slippery or bumpy surface. When the center differential is locked, the vehicle stability control system is automatically turned off and the center differential lock and "VSC OFF" indicator lights come on because the function that controls engine performance interferes with the process of freeing your wheels. NOTICE Center differential lock switch Use the multi-mode control switch knob and center differential lock switch to select the transfer and center differential modes. The "H4" and "L4" positions of the multi- mode control switch knob provide either lock or unlock mode of the center differential depending on the center differential lock switch position. As soon as the center differential lock switch is turned on, the "VSC OFF" indicator light comes on. After the wheels are out of the ditch or off the slippery or bumpy surface, turn the center differential lock switch off. Make sure that the center differential lock indicator light and vehicle stability control system off indicator light turn off. Multi-mode control switch knob 141 2003 4RUNNER from Apr. '03 Prod. (OM35820U)