How do you adjust the headlights for a 2000 nissan xterra

My first guess would be a short in one of the bulbs that make contact with both the parking and turn signal circuits. You may want to remove the bulbs to see if one is shorted to both circuits. I don't think the headlight switch would have anything to do with the hazard or turn signal circuits unless its something between the hazard switch and headlight switch wiring.

You don't adjust the idle until you've cleaned the carbon from the intake system. then you need a scanner to perform an idle learn

time belt broke

are there any codes on other then the overdrive. I had a few in my shop with a common distributor problems

It is the electrical harness. Take it to Nissan and tell them it is the electrical harness. I was driven nuts for close to 2 years trying to figure out the problem while fuses and headlights were blowing. It turned out to be a severed fillament in the electrical harness.

Does the "bright light" indicator light come on when the brights are not?

http://www.nissanextendedwarranty.com/owners-manual/nissan/2000-Nissan-Xterra.pdf

The adjustment screws/nuts should be located either on the top of the headlamp assembly, behind the headlamp assembly, or near the frame rail by the radiator support.

You will have vertical adjustment screws for each independent beam (separate highs and separate lows, but will be same screw if highs and lows are the same bulb). You may also have additional horizontal adjustment screws as well

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.

on each headlamp assembly, there will be either one or two plastic nuts that you can turn.

If you only have one nut on each, that will adjust the vertical aim of the headlights.

If you have two nuts on each, one will adjust the vertical and the other will adjust the horizontal.

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

on each headlamp assembly, there will be either one or two plastic nuts that you can turn.

If you only have one nut on each, that will adjust the vertical aim of the headlights.

If you have two nuts on each, one will adjust the vertical and the other will adjust the horizontal.

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

starter possibly going bad