Toyota Highlander Service Manual page 457

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The seat heaters and seat heaters/ventilators can be used when
Vehicles without a smart key system

The engine switch is in the "ON" position.
Vehicles with a smart key system

The engine switch is in IGNITION ON mode.
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When not in use
Seat heaters

Turn the dial fully backward. The indicator light will turn off.
Seat heaters/ventilators

Set the knob at "0". The indicator light will turn off.
Second seat heaters
Hi
1
Lo
2
Off
3
The indicator comes on when the
second seat heater is on.
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The second seat heaters can be used when
The engine switch is in IGNITION ON mode.
HIGHLANDER_U (OM0E017U)
6-1. Using the air conditioning system and defogger
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