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Circuit/System Description

For an overview of the component/system, refer to: Rear Window Defogger Description And Operation 

Circuit Description
Control - Relay Coil The output circuit is switched to 12 V to activate the component.
Ground - Relay Coil Chassis Ground
Component Description
KR5 Rear Defogger Relay A relay is a switch that is actuated by a solenoid.
K33 HVAC Control Module The control module controls a series of actuators to ensure optimal heating, ventilation and air conditioning of the passenger compartment. The control module does this by reading values from a variety of sensors and interprets the data and adjusts the actuators accordingly.