How can u tell which bulb is high or low in headlight (looking for a diagram)

Sounds like you need to look for a bad ground for the passenger headlight.

If you give us year--make--model, I'll try to look up wiring diagram?

It is very common for both headlights to be bad, as we use our low beams a lot more than high beams. I would first suggest replacing the headlight bulb. The low beam filaments could be bad and the high beams be ok. If this doesn't help feel free to let me know and I will be happy to look a little deeper for you.

if the fuses are good then you need to check for power and ground at the headlight plug that attaches to the headlight bulb if you have a good power and ground there and the connections are good then the bulbs are both no good.or if you can tell the bulbs are burnt out by looking at them then you don`t have to check powers and grounds.you also can directly feed power and ground to the bulb and check both the terminals for high beam and low beam as you cannot tell which is which by looking at the terminals

I looked in the Honda technical manual wiring diagrams and I don't think there is a separate relay for the low beam headlights. The headlight switch itself is located right above the steering column where the headlight stalk is attached - controls parking lights, high beams and low beams. It could be that a relay is integrated within this switch,

have you looked at all the fuses,, and any relays,, it could even be a bad earth on the light itself or a bad buld holder if its got hot and burnt away, there are a fuw things to look at

If I remember correctly nissan uses a L&R high and low beam fuses,might want to double check them,but if you need any diagrams just ask have a good day DB

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.

headlight relay is the problem. it is located in dash above radio in a fuse cluster. local autozone can tell you exactly