How to replace turn signal bulb for BMW 3 Series (E46)

Car turn signals or blinkers are flashing lamps, positioned at all four body corners. The appearance of these lights are controlled by the driver to notify others, that the vehicle is prepared to turn, switch lane or turn around. It's relevant turn signals are used whenever necessary, so that other drivers have enough time to plan their further actions. That is the reason, all directional signals should perform well. For the most part, the grounds for a malfunctioning turn indicator is a dead bulb, which can be detected even from the inside of the vehicle: when failing side turn signal is activated, flickering rate of a corresponding indicator in dashboard will be increased, although sole bulb has failed.