Why is there a button to pop up the headlights on my [DSM]?

1990-1991 DSMs had pop-up headlights. The popup button raised the lights even if they were off. Since 1992-1994 DSMs did not have pop-up headlights, this switch is not installed. There is a "blank" where the switch would have gone. The installation of such "blanks" is commonplace in automotive design. If desired, a pop-up switch, fog light switch or other stock DSM switch can easily be installed into the "blank" spot to control auxiliary lighting or other special equipment.

It is true that the pop-up switch is slightly redundant on 1990-1991 cars since the headlights pop-up automatically when switched on. It is possible to prevent them from doing so. Owners sometimes want to do this to allow them to look "cooler" when using the headlights as daylight running lights. Others prefer to run the headlights down and use the high beams to make up for the lost light. [Note: The writer of this FAQ does not recommend operating the headlights down at night.]