TOYOTA 2012 Tacoma - Manual (Page 171)

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2-4. Using other driving systems
■
After unlocking the rear differential
To check that the indicator goes off, turn the engine switch to the ON posi-
tion, but do not start the engine.
CAUTION
■
To avoid an accident
●
Do not use the rear differential lock system except when wheel spinning
occurs in a ditch or on a slippery or ragged surface. Large steering effort
and careful cornering control will be required.
●
Do not lock the rear differential until the wheels have stopped spinning.
Otherwise, the vehicle may move in an unexpected direction when the dif-
ferential lock is engaged, resulting in an accident. This may also lead to
possible damage to differential lock component parts.
●
Do not drive over 5 mph (8 km/h) when the differential is locked.
●
Do not keep driving with the RR DIFF LOCK switch on.