1998 Honda Civic Owner's Manual - Page 189
1998 Honda Civic Manual
Page 189 highlights
Lights 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. 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. 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. HORIZONTAL ANGLE GAUGE VERTICAL ANGLE GAUGE BUBBLE 5. Check the vertical angle gauge. The bubble should be centered underneath the longest scribe mark on the gauge. Maintenance