pupdef@gmail.com wrote in news:28927a79-dca8-46f2-b553-048f3af825f5@
59g2000hsb.googlegroups.com:

> First, thanks to everyone who answered my post about my 2001 Honda
> Civic with both headlights out.
>
> Further investigation reveals that the high-beams work, but not the
> low-beams. I replaced one bulb to see what happens, and it's the same
> thing - the low-beams don't work but the high-beams do. The fuses for
> the headlights look good, but as someone suggested, they could be bad
> anyway. I don't have a multimeter to test them. Should I just replace
> the fuses and see what happens?
>
> Tegger - you mentioned a third, 100a fuse under the hood that protects
> both sides of the headlight circuit. The biggest fuse that I can find
> in the under-hood fuse box is an 80a fuse that protects the battery.
> Is there one somewhere else?
>
>




Do you have any aftermarket add-ons, like stereo, alarm, remote start,
foglights, etc.?

If there are no intrusions into the electrical system, then your
combination switch is going bad. That's the stalk on the steering column
which controls the headlights.

The combo switch provides a common ground for the two headlamp relays
(the ground activates the relays), plus it provides a common ground path
for the high/low beam switch.

You need to buy a cheap multimeter (available at any auto parts place)
and some test wire and start tracing the circuits and actually testing
the fuses.

Try temporarily swapping in a 15A fuse from some other circuit, just to
be sure the fuses are OK.

Two simple tests you can perform if the fuses are good:
1) Ground terminal 7 of the combo switch connector (blu/red wire). Do
the low beams now come on? Then the on/off portion of the combo switch
is bad.
2) Turn the headlight switch to low beams. Ground terminal 6 of the
combo switch connector (red/wht wire). Do the low beams come on now? If
so, then the high/low portion of the combo switch is bad.

It seems for test #1 you can tap the blu/red wire from the back of the
fuse block, so you don't have to mess with the steering column. But for
test #2 it looks like you need to either pull the column covers or
ground the red/white wire by backprobing it at the headlamp connector.


--
Tegger

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/