Power it. The sensor bar is really just a collection of infrared LEDs. With the standard sensor bar, just plug it into the back of the Wii console.
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To connect the Wii Nunchuk controller to the Wii, first put the cord through the connector hook on the Wii Remote wrist strap and then the locate external extension connector on the base of the Wii Remote to insert the Nunchuk plug.
the sensor reads where the remote is in relation to the sensor and reads what way the remote moves (up, down, left, right) the wii reads this info as if it were a button on a gamepad
There should be a flap that lifts up ontop of the wii and there are 4 slots to plug the controller into put it into the closest one to the power button. Not all wii's have that flap. The newer ones with new mario bros. wii dont have the flap, so the controller wont work. Found this out from gamestop.
open the bak of the controller (where the batteries go) and find the little red button. go to the wii & open the little cover at the front (where a sd card goes and find red button hold them both down simultaneously and wa-lah!! ;D
once the wii system is on and you click start for the certain game hold down 1&2 at the same time until its connected....ver easy