Honda 1998 Prelude Owner's Manual page 204

Headlight Aiming
The headlights were properly aimed
when your vehicle was new. You
should check their aim if you
regularly carry heavy items in the
trunk or pull a trailer. Each headlight
assembly has horizontal and vertical
adjustment indicators. These are set
to their "0" positions after the
headlights are aimed at the factory.
To check these settings:
1. Make sure the fuel tank is full.
Park the vehicle on level ground.
2. The driver or someone who
weighs the same should be sitting
in the driver's seat for all checks
and adjustments.
Load the trunk with the items you
normally carry.
HORIZONTAL ANGLE GAUGE
If you usually pull a trailer, load it as
you would normally and attach it to
the vehicle. Push down on the front
and rear bumpers several times to
make sure the vehicle is sitting
normally.
3. Open the hood.
4. Check the horizontal angle gauge.
The line on the adjustment screw
indicator should line up with the
"0" mark on the gauge.
VERTICAL ANGLE GAUGE
5. Check the vertical angle gauge.
The bubble should be centered
underneath the longest scribe
mark on the gauge.
Maintenance
Lights
BUBBLE
CONTINUED