on the 06 double cab, check the 15amp power outlet fuse first. then check the fuse for the "brain" of the system. it is the 7.5amp rad #2 fuse. all three outlets work off the same two fuses.
the power outlet system is not connected to the cig ligher system.
if both fuses are good, then the next is the 140amp alt fusible link.
note: the ipo cuts off the power if the demand is over 6Ah and for
five seconds after the ign switch is turned to the start position.
for the 05/06 sequoia, see above. yspert