2001 Toyota Tundra Owners Manual - Page 170

'01 TUNDRA_U (L/O 0008) Place the transmitter with Velcro square facing inside of box into the box. Make sure the transmitter button is located above button pins. Remove spacers from the center panel. Place the largest spacer on the pin that would be below transmitter button when the cover is closed. Close the cover. When the garage door opener transmitter is properly installed, you can operate the transmitter by pushing the center panel of the cover. 2001 TUNDRA (OM34416U) 159