don't know about new models, but my 1992 civic doesn't have a
headlight relay. (i put one in, along with decently large gauge
wiring. significant improvement, highly recommended. thanks to stern
lighting for advice).
If one of the individual lamp fuses blows, the other side is **NOT**
affected, so that's not your problem.
Do the headlamps work if you pull the headlamp switch stalk towards
yourself? (Flashes high beams.) What about if you turn the the stalk to the
Don't ignore the obvious here: the possibility that both of your low-beam
filaments have failed at the same time. Buy a new bulb (even a cheap one),
swap it in and see if it works.
You actually have a third, 100A fuse, under the hood. This protects both
sides of the headlamp circuit. See if that's blown. You'll need a test lamp
or multimeter to check that one.
Yes, unlikely as it sems; that happened to me. and i'm the kind of guy
who checks the reflection in the back of the car in front of me at
night to make sure they're both working, so it's not like one burned
out and the other one a month later.
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