After refueling, turn the fuel tank cap until you hear a click. Once the cap is released, it will turn slightly in the opposite direction.

Caution
When replacing the fuel tank cap
Do not use anything but a genuine toyota fuel tank cap designed for your vehicle. Doing so may cause a fire or other incident which may result in death or serious injury.
Opening the fuel tank capAir conditioning control assembly (for automatic air conditioning system)
Components
Removal
Disconnect cable from negative battery
terminal
Notice:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
Remove no. 2 Instrument cluster finish
panel center ...
Rear occupant classification sensor lh collision detection
Description
Dtc b1787 is output when the occupant classification ecu receives a collision
detection signal sent by
the rear occupant classification sensor lh when an accident occurs.
Dtc b1787 is also output when the front seat assembly rh is subjected to a
strong impact, even if an
actua ...
Front seatback heater
Inspection
Inspect front seatback heater assembly
lh
Measure the resistance of the seatback heater.
Standard resistance
If the result is not as specified, replace the seatback
heater assembly
Inspect front seatback heater assembly
rh
Hint:
Use the same procedures desc ...