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 capCenter power outlet socket
Components
Removal
Disconnect cable from negative battery
terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
Remove no. 1 Console upper panel garnish
(see page ...
Reassembly
Caution:
Wear protective gloves. Sharp areas on the seat frame
(with adjuster) may injure your hands.
Install front seat wire
Install seat position airbag sensor (see
page rs-390)
Install lumbar support adjuster assembly
Install the lumbar support adjuster with the 2
screws.
...
Calibration
Description
After replacing components relating to the vsc or
performing "front wheel alignment adjustment",
clear and read the sensor calibration data.
Follow the chart to perform calibration.
Clear zero point calibration data (when using
intelligent tester)
...