Turn off the wii. Take a wiimote that is synced to the wii and press the power button on the wiimote. The wii should turn on when doing this on a synced wiimote. If the wii does not turn on and the wiimote was synced to the wii, you bluetooth module is probably dead and need to be replaced. If you don't have a wiimote that is synced to the wii the only way to test the bt module is replacing it with a known working bt module.