You may want to check the low beam fuse located in the fuse box, the fuse box maybe either be under the driver's side dashboard or under the hood, if that doesn't work then you may have a loose ground wire for the low beam and need to trace a green or brown wire coming from the head lights to see if it is exposed or loose.
**In addition, There is a recall on the headlight switch for 2001 civic (and perhaps many others.) This is a safety recall and it affects all vehicles regardless of whether you are the original owner.
But beware when bringing your civic into the dealership to have the work done - They don't particulary like doing recall work without hitting you in the wallet on the way out. I brought mine to Silko Honda in Raynham, MA and they replaced the switch - only to tell me I still needed head lamp bulbs at $35 per side (and with no Vasiline to go along with the deal, if you know what I mean..)
I took the car home, removed the steering column cover, disconnected the directional plug and cleaned the contacts (the one for the low beam was a bit dirty, interestingly.) After performing this tedium, low and behold: My headlights worked ($70 for bulbs my A$$.)
So in short, first get to the directional plug and clean the contacts. You may not even need to have the switch changed out. But if you do, wear a chastity belt before going into the stealership. They have one goal and one goal only: To drain your pocket as much as they can.
My 2001 Honda Civic LX low beams went out and only the high beams worked. I checked with my local Honda Dealer and there is a recall on certain vin numbers. Mine was on the recall list. The dealer repair it at no charge to me.
try new light bulbs
Your high beams work but your low beams do not because the switch is broken that switches between high and low beams. Electrical switches wear out.
Bad dimmer switch.
I looked in the Honda technical manual wiring diagrams and I don't think there is a separate relay for the low beam headlights. The headlight switch itself is located right above the steering column where the headlight stalk is attached - controls parking lights, high beams and low beams. It could be that a relay is integrated within this switch, so if you're having problems with your low beams turning on, you'll have to replace this switch.
low beams my have burned out
yes they are a dual filament bulb. Be careful when taking them out. they have a metal clip that is held on by a little plastic peice that breaks easily
The AC low pressure switch of a Honda Civic is located on the driver's side of the radiator. It is screwed into the accumulator bottle.
9006 for low beams and 9005 for high beams
As a guess both low beams are burnt out The daytime running and high beams are the same light filament. Or the fuse or the relay for the low beams.
Bad bulbs?Bad Hi-low switch?
If low beams do not work and the high beams of a Mitsubishi Eclipse do, it is probably due to a corroded connector. Simply clean the connector and add some petroleum jelly to the terminals.