Compressor HVAC: Testing and Inspection

The air conditioning control assembly outputs the magnetic clutch ON signal from terminal MGC to the ECM.
When the ECM receives this signal, it sends a signal from terminal ACMG and switches the A/C magnetic clutch relay on, thus turning on the A/C magnetic clutch.
The air conditioning control assembly also monitors at terminal NC IN whether or not power is being supplied to the magnetic clutch.

Diagnostic Chart:

Wiring Diagram:

Inspection Procedure - Step 1:

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