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Circuit/System Description

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

Circuit Description
Rear Defog Indicator Control The output circuit is switched to 12 V to activate the component.
Component Description
K9 Body Control Module The module controls various vehicle functions like lighting, central door locking, power windows, etc.
K33 HVAC Control Module This device is the user interface to control the HVAC system. Some buttons and indicators are hardwired, some functions use serial data communication.
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