Toyota TUNDRA 2004 Owner's Manual page 310

Place the transmitter with Velcro square
facing inside of box into the box. Make
sure the transmitter button is
above button pins.
Remove spacers from the center panel.
Place the largest spacer on the pin that
located would be below transmitter button when
the cover is closed. Close the cover.
'04 TUNDRA_U (L/O 0309)
When the garage door opener transmitter
is properly installed, you can operate the
transmitter by pushing the center panel of
the cover.
2004 TUNDRA from Sep. '03 Prod. (OM34426U)
301