Toyota 4RUNNER 2010 Quick Reference Manual page 249

2-4. Using other driving systems
CAUTION
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Shifting the front-wheel drive control lever from H2 to H4 while driving
Never operate the front-wheel drive control lever if the wheels are slipping.
Stop the slipping or spinning before shifting.
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I n f o r ma t i o n P r o v i d e d b y :