Modern cars with key ignitions usually have four main positions: LOCK, ACC, ON, and START. Each performs a different function.  1. LOCK (Off/Steering Locked) The engine is off. Steering wheel is locked for security (in most cars… Read on blog or Reader Magari Poa Read on blog or Reader Car Ignition Switch Positions Explained By Magari Poa on 04/12/2025 Modern cars with key ignitions usually have four main positions: LOCK, ACC, ON, and START. Each performs a different function.  1. LOCK (Off/Steering Locked) The engine is off. Steering wheel is locked for security (in most cars). Key can be inserted or removed only in this position. No electrical systems work except basic security systems.  2. ACC (Accessories) Accessories receive power. You can use: Radio Power windows (in some cars) Charging ports The engine remains off. Ideal for listening to music without starting the engine.  3. ON (Ignition / Run position) Powers all electrical systems in the car. Dashboard lights illuminate for checks (ABS, oil pressure, battery, engine check, etc.). Engine is ready to run, but not yet cranked. When the engine is running, it returns to this position. 4. START This position engages the starter motor to crank the engine. You must hold the key in this position. Once the engine starts, the key automatically springs back to ON. Designed to be used briefly only. Summary Table Position Engine Electrical Power Steering Purpose LOCK Off Minimal Locked Security, key removal ACC Off Partial (radio, accessories) Free Non-engine power use ON Running/Ready Full Free Driving position START Cranking Starter only Free Starting engine Comment

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