What does it mean when the BMW ignition switch is turned on?

[LeAdelyn]

When the BMW ignition switch is turned on, it means the vehicle's electrical circuit has been successfully activated. Below is an extended introduction: 1. Concept of the ignition switch: The ignition switch is the most important switch in a car's electrical circuit, serving as the control hub for various circuit branches. 2. Main functions of the ignition switch: Its primary functions include: locking the steering wheel shaft (Lock), activating the ignition and instrument indicators (ON or IG), the start (ST or Start) position, the accessory position (Acc, mainly for the radio), and for diesel vehicles, an additional (HEAT) position. The start and preheat positions involve high working currents, making it unsuitable for prolonged activation. Therefore, these positions require manual operation to overcome the spring force—holding the key in place—and will spring back to the ignition position upon release, unable to self-lock. Other positions can self-lock.