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.

Warning
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 capTerminals of ECU
1. CHECK SLIDING ROOF DRIVE GEAR SUB- ASSY (SLIDING ROOF ECU)
(a) Disconnect the sliding roof ECU connector, and check the
voltage or continuity of each terminal of the wire harness
side connector.
If the result is not as specified, there may be a malfunction on
the wire harness. ...