The traditional automotive ignition key is a physical, cut-metal blade inserted into a mechanical steering column or dashboard lock cylinder to start a vehicle. This technology has been largely discontinued as a primary method in modern vehicles, replaced by electronic systems.

Description of Traditional Ignition Keys

Mechanical Function: The key physically engages a series of internal tumblers within the ignition cylinder. When the correct key is inserted and turned, the tumblers align, allowing the cylinder to rotate through different positions: off, accessory, on, and start.

Security Features:

Mechanical Matching: The unique cuts of the key served as the initial line of defense against unauthorized use.

Transponder Chips: Beginning in the late 1990s, keys evolved to include an embedded electronic transponder chip. This chip transmits a low-frequency signal to an antenna in the ignition; if the car's immobilizer system recognizes the unique code, the engine is allowed to start.

Evolution: Early cars had separate keys for doors and ignition until Chrysler introduced a single ignition key in 1949, which became an industry standard. Ford introduced the double-sided key in 1965.

Discontinuation and Replacement

Automakers began moving away from traditional keys for several reasons, primarily convenience and enhanced security.