2008 Toyota 4Runner Owners Manual - Page 211

07 12.25 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. The center differential can be locked or unlocked by pushing the center differential lock switch. 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 and "VSC OFF" indicator lights turn off. "H4" (high speed position) and center differential unlocked: Four −wheel drive control switch knob at "H4", center differential unlocked 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) and center differential locked: Four −wheel drive control switch knob at "H4", center differential locked Use this for greater traction when you experience a loss of power, such as wheel slipping, in the center differential unlock mode. "L4" (low speed position) and center differential unlocked: Four −wheel drive control switch knob at "L4", center differential unlocked The "4LO" (low speed four −wheel drive) indicator light comes on when the "L4" mode is selected. Use this for maximum power and traction. Use this for climbing or descending steep hills, off −road driving, and hard pulling in sand or mud. In this mode, the braking feeling that occurs when the wheels are negotiating a sharp corner is further reduced than in the "L4" (low speed position) and center differential locked mode. "L4" (low speed position) and center differential locked: Four −wheel drive control switch knob at "L4", center differential locked The "4LO" (low speed four −wheel drive) indicator light comes on when the "L4" mode is selected. 169