2003 Toyota 4Runner Owners Manual - Page 1238

'03 4Runner_U (L/O 0305) Four-wheel drive system (full-time four-wheel drive models)- (a) Four-wheel drive control Use the four-wheel drive control switch knob and center differential lock switch to select the transfer and center differential modes. The "H4" and "L4" positions of the four- wheel drive control switch knob provide either lock or unlock mode of the center differential depending on the center differential lock switch position. 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 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. "H4" (high speed position, center differential unlocked): Four-wheel drive control switch knob at "H4", center differential lock switch left out Use this for normal driving on all types of roads, from dry hard-surfaced roads to wet, icy or snow-covered roads. This position gives greater economy, quietest ride, least wear and better vehicle control. "H4" (high speed position, center differential locked): Four-wheel drive control switch knob at "H4", center differential lock switch pushed in Use this for greater traction when you experience a loss of power, such as wheel slipping, in the center differential unlock mode. Four-wheel drive control switch knob Center differential lock switch 138 2003 4RUNNER from Apr. '03 Prod. (OM35820U)