There should be 3 buttons in the pedals, 2 in the brake, and 1 for the clutch. 1 button is for the brake lights the other two are for the cruise control. I think I have a spare one some where if your brake lights are always on.
Normally the dim headlight is the headlight switch has dirty contacts. You need to remove it and take it apart and clean them. I used a green scrubbie but was told pencil erasers work too. It's fairly easy to do.
The rear defogger sensor is for the auto on function, you should be able to push the switch manually to turn it on.