2000 Chevrolet Silverado lighting problems

The headlight problem involves an override button installed on the 2000 silverado that is to bypass the auto headlight on even during the day. The button, according to the manual, is to be able to turn off the headlights ( this is the only way, there is no off position ) if you are stopped, ( like at a burger place) with your engine running & you don't want your lights on. But, I found that you also can be going down the road, ( I did this going 50 MPH), & push this button 3 time & all the lights go out.

I am writing to seek some assistance with an inferior product produced by GM. I have a chevy 2000 silverado z71 pick up that has piston slap starting at around 15k miles and progressively worsened which the dealer states is normal wear. This expensive vehicle also has a rear end bang into drive and then reverse again the dealer states is normal. Recently I fixed a snapped cable for the drivers window which the same kind of cable was recalled for the tail gate cables.