What are the symptoms of a faulty ignition switch?

[OWeston]

Since the ignition switch controls the activation and deactivation of the ignition coil, if the ignition switch malfunctions, the vehicle will not start normally. The most direct manifestations include failure to ignite, inability to turn off the engine, unexplained stalling, or even the malfunction of circuits controlled by the key. Below is an introduction to the ignition switch: The ignition switch is the most crucial switch in a car's electrical system, serving as the control hub for various circuit branches. It can freely activate or deactivate the ignition coil and has four positions: START, ON, ACC, and LOCK. Its primary functions include locking the steering wheel shaft (Lock), turning on the ignition and instrument indicators (ON or IG), the start position (ST or Start), and the accessory position (Acc, mainly for the radio). For diesel vehicles, an additional (HEAT) position is included.