Thanks to SilverF16 for this tutorial.
My rear height sensor has corroded due to the winter salt and now my headlights are pointed up at oncoming drivers' face.
Prior to getting it replaced, here's my solution. Thought I share with the group here since a new sensor cost between $100 to $300 (costs I've seen posted) for cars that are no longer under warranty.
Here's a $0 option to get the lights aimed back down and not have to replace the broken sensor. This solution will not give you a malfunction light on your dash either. The one draw back is that you will now disable the Auto leveler system. Which I feel is pretty useless as it is. The auto adjustment under Acceleration and Braking are so minor. Besides all Honda/Acura cars with HID do not have auto leveling system.
Here's what you do:
1. Pull up 5-10 feet away from a wall at night. A dark garage would work here.
2. Turn the ignition to off with headlight off.
3. Turn the ignition to the on position (not start)
4. Now turn on your headlights and watch the headlight adjustment goes thru it range of movements up and down. If you sensor is broke, you will likely see the headlight stop at the highest position (blinding other drivers).
4a. Mark the high and low positions on the wall if necessary. If you choose to do this, you will need a helper to mark the positions.
5. Repeats steps 2-4 to reinitate the headlight movement cycle.
6. As the headlight moves thru it range, and as it gets to the desired point (somewhere between the highest and lowest position), turn off the ignition. You want to turn off the ignition when the headlights are still moving.
6a. By turning off the ignition, you just cutpower to the auto level system and locked the headlight into its new setting.
7. Turn off your headlights.
8. Pull the connector/harness going to the Auto headlight leveling module. This is located on the drivers side above the left kick panel and under the dash. Just crawl under the dash and you will see it. You do not need to remove any trim panels to get to this connector.
8a. The module is labelled auto headlight leveling. It is in a metal casing and has about 20 wires on the connector. It is next to the ABS module and the theft deterent module (if you know where those are). It pretty easy to find if you know where to look for it. See attachment for a guide. It is component labelled H15 in the photo. To remove the connector, you need to first push on the connector tab, the wiggle and pull.
9. You are done. You just locked in your new position and there will be no malfunction light on your dash because you have disabled the entire unit.
10. Go for a drive at night and check your aim. If the aim needs further adjustment, turn off the ignition, turn off your lights, and plug in the connector again. MAKE Sure you turn off ignition and headlight before you plug and unplug the sensor. Now repeats steps 1-8 to readjust.
What about using the manual threaded adjusters on the headlight assembly as an alternative method instead? Well, there is a minor issue with that. On my 2004 model (2002 and earlier may be different), the screwed adjuster are tied in to both the high beam and low beam. So if you tried to lower your low beam headlight so you are not shinning in people face, you will also lower you high beam headlight to the point they are pointed on the ground and will not be effective.
For 2001 and 2002 cars, I believe the vertical adjustment are not coupled so you do have independent adjustment. I don't know how 2003 are setup.
There is a way to de-couple the high and low beam vertical adjustment so you have independent control of both beams, but that can be covered in another thread. I've already de-coupled it so I have independent control.
In addition, you may not want to touch the manual adjustment screws because these are your base factory setting. And why change your base setting to compensate for a failed part. And if you ever do replace the broken sensor, you may have to readjust your base setting again.
Hope this info is useful to some of you.