Why YSK: Your signals alert other drivers as to what you’re doing; a signal bulb costs a few bucks and is usually a quick and easy repair to do yourself (consult YouTube); and any place that regulates motor vehicles probably requires you to have working turn signals. So knowing when and how to replace a burned out signal bulb can save you an interaction with law enforcement.
Adding: You can diagnose which bulb is out by turning on your hazard lights and checking all four corners of your car. It’ll be the one not flashing.
This is also probably a good time to check your brake lights. Put something heavy on the pedal or have a friend hold it down and check that all three brake lights illuminate. Replacing a burned out brake light is also usually pretty cheap, quick, and easy.
Many seem to have the attitude that if you never use them, the bulbs will never burn out. Problem solved.
How is your BMW these days?
This 'hyperflash’ing will also happen if you have replaced an incandescent bulb with an LED bulb due to the different power requirements.
LEDs draw so much less power that they don’t draw enough current through the flasher relay. The relay will then think that the bulb is burned out.
To fix hyperflash due to having installed LED bulbs you can wire a resistor inline or replace the flasher unit with a unit designed for LED bulbs.I sometimes back into parking spaces that are in front of a glass storefront so I can see that my brake lights are working.
