2001/2005 Honda Civic turn signal not flashing fix 

If your turn signal lights are not working, it's best to first check the most likely reason, which is burnt light bulbs. Gain access to the headlight housing through the trunk. Then, unplug each light bulb's wire harness, and replace both bulbs with new ones.only if they are flashing fast on the dash but no actual lights are flashing outside the car