I have a 4 door 98 civic lx... all windows don't go down... checked all fuses already and bought a new primary drivers side window switch... no window still functions.. last resort means the window relay... I need to know the location or part number for this part... thanks for help guy:)

1. Check all under-hood and under-dash fuses with a test light or multimeter:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-honda-civics-46563-3.html#post252145

2. Power window relay should be in the under-dash fuse/relay box. Often, it's the relay to the top left. You should verify this, however. I would remove it first and check for corrosion.

3. I suspect a blown fuse in the under-dash fuse/relay box, since all windows do not work. After that, you are right to focus on the power window relay. If none of that solves the problem, check for a poor ground.