Quote:
Originally Posted by ah-kay
The CCU controls PIN 10. When it calls for A/C, PIN 10 goes LOW ( 0 Volt ). It is normally sitting at 12V, i.e. A/C off. You measure voltage, not Ohm. Switch DVM to voltage, clip the black probe to -ve of battery and the Red probe to PIN 10, then cycle the CCU to call to A/C to test.
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Unless the 124 is different, pin 10 will be grounded to close the relay for the compressor clutch. Accordingly, you measure resistance for confirmation.