Lexus ES300 Starter Solenoid provides the important flow of current from the battery which allows the engine to crank in a timely manner. Acting as an electromagnet relay, the Starter Solenoid takes a small signal from the ignition switch, closes heavy contacts, and sends high amperage to the starter motor and pushes the pinion into the ring gear. Once the motor spins and the driver releases the key, the device opens the circuit for the starter to disengage and a built-in one-way clutch to shield it from back drive. Earlier inertia Bendix drives use gear momentum rather than a separate Starter Solenoid, but all later Lexus ES300 adopt the contactor style for faster engagement. Within Lexus schedules, the ES300 recommends inspections of Starter Solenoid terminals. If corrosion or a weak battery has limited power, the Lexus unit may just click to indicate the ES300 needs attention to its wiring or battery as opposed to the Starter Solenoid itself.
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