The Nissan Sentra Relay units are smart electrical switches through which full power from the battery is delivered to the climate control system and other circuits only upon receiving a control signal. This protects all the components while ensuring comfort in the cabin. Through current flow to the Relay, a signal is transmitted to the wire coil lament in order to close or open the high current contacts that provide power to the fan motor, blower motor, or compressor clutch. With the Relay opening and closing, a heavy load is prevented from passing through the delicate controls on top of the dashboard. The recent Sentra models are configured using either a traditional electromechanical Relay with moving contacts or a solid state version that replaces contacts with semiconductor gating for no wear and high speed response. Over the years, Nissan has kept the control logic simple. Certain trims additionally include a latching feature which keeps the trim engaged after just one pulse in case of a voltage drop thus saving energy. The style may vary, but the failure is quickly noticed by the drivers. A stuck or burned Relay keeps the fan silent, the blower idle, and causes fault codes until normal airflow resumes after changing it. The climate chain of every Nissan, no matter how compact, depends on these little shrouds. Every generation of Sentra continues to depend on the simple little Relay that makes sure temperatures stay just right.
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