The climate controlling elements of the Toyota Sequoia typically depend on its Relay, which acts as the electrically controlled switch through which low power signals from the sensors go to the higher power devices like the fans and the blower motor. The Relay receives a modest current from the AC control module to snap the contacts together through an internal electromagnet. As a result, full battery voltage reaches the load so that cool or warm air flows as needed. Throughout its successive Toyota model years, the Sequoia gives a basic choice between two styles, the familiar electromechanical Relay with moving contacts and the solid state Relay with semiconductor parts for silent, wear free action. The electromechanical version has the advantage of easy diagnostics by the audible clicking sound. The solid state version gives a quicker reaction and longer life because no parts touch. Both can be integrated as either fan or blower motor Relay units inside the fuse block. Each component protects its own circuit. They isolate the control logic from the heavy current. Replacing a failing unit is usually the easy way to restore comfortable cabin temperatures and safeguard your Toyota Sequoia system from cascade failures.
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