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Assuming this is an LX, check 7.5A fuses 9 and 5 in the driver's underdash fuse/relay box. Fuse 9 applies power to the DRL indicator light in the gauge assembly which connects to the DRL control unit. Fuse 5 supplies power to the DRL control unit when the ignition is on. Also check 100A fuse 41 in the underhood fuse/relay box which supplies power to the headlight relays. Setting the headlight switch to HEAD causes the headlight relays to close and apply power through 20A fuses 45 and 43 in the underhood fuse/relay box to the low beams. Low beam power also passes through the DRL diode to close the high beam cut relay and prevent high beam use during DRL operation.
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.