Driving a car without a working horn is illegal. You need a horn in case of emergency situations and for warning others of hazards and/or dangerous situations when driving. If your horn is not working, have it replaced or repaired immediately.
Many moons ago, Carmen became an ICBC-approved driving instructor at the age of 22 in North Vancouver, and has spent many years working with new and experienced drivers around the lower mainland. She can be found reading the Motor Vehicle Act for fun while receiving strange looks from others. May the quest for great driving continue!