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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 99 (HVAC - Automatic) >> Diagnostic Information and Procedures >> DTC P0645, P0646, or P0647 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to:Automatic HVAC Description and Operation 

Circuit Description
Ignition - Relay Coil Supplied from a relay.
B+ - Relay Switch Supplied from a fuse.
Control - Component The output circuit is switched to 12 V to activate the component.
Control - Relay Coil The output circuit is switched to ground to activate the component.
Ground - Component Chassis Ground
Component Description
Q2 A/C Compressor Clutch The clutch is normally disengaged.When the solenoid actuator is turned on, the clutch engages and couples the belt pulley to the compressor.
K20 Engine Control Module The control module contains a microprocessor used to process input data to control outputs.