2008 Toyota 4Runner Owners Manual - Page 215

07 12.25 (b) A.D.D. (automatic disconnecting differential) Use this for maximum power and traction. Use this for hard pulling in situations the vehicle cannot negotiate even in the "L4" (low speed position, four −wheel drive) and center differential unlocked mode. Also, using this mode when driving down steep off −road inclines will help contribute to increased vehicle stability. The indicator light tells when the differential lock is engaged. Note that the differential is not still locked as long as the indicator light remains off. When the operation is not completed, the indicator blinks. If the indicator light does not go off when you push the center differential lock switch to unlock the center differential, drive straight ahead while accelerating or decelerating, or drive in reverse. If the center differential lock system operation is not completed within 5 seconds while the cruise control system is set, cancel the cruise control system. To cancel the cruise control system, see "Cruise control" on page 203 in Section 1 −7. If the indicator blinks even if doing so, contact your Toyota dealer as soon as possible. There may be a trouble in the center differential lock system. See "(c) Shifting procedure" for further instructions. The A.D.D. can be engaged or disengaged by the shifting operations described in "(c) Shifting procedure". You should drive in four −wheel drive for at least 16 km (10 miles) each month. This will assure that the front drive components are lubricated. 173