The electrical power and engine starting in Toyota 4Runner are controlled by the Ignition Switch. The Ignition Switch is mounted on the steering column of the 4Runner and operates with a keyed lock cylinder that only turns when the right key is inserted. While in the start position, the Ignition Switch sends battery current to the starter motor, fuel injection, and ignition circuits to crank the Toyota engine in the 4Runner. The constantly on position of the Ignition Switch supplies power to the engine systems and components when the engine is running and the key is released to the on position. The acc position means you can operate the radio or windows without running the engine. Off cuts power, and the lock position allows you to remove the key and locks the column so the steering can't be moved. A coded key system fitted to various models of Toyota communicates with the onboard computer. If the code isn't recognized, the engine won't start, thus preventing car theft. The Ignition Switch is required for the proper functioning of the engine and electrical components. However, wear and internal contact faults may lead to hard starting, stalling, and loss of lights and components. As such, your Toyota 4Runner's Ignition Switch must operate reliably under all conditions.
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