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A/C Switch: Notes

Disconnect ECM connector. Turn ignition switch and A/C switch to ON position. Using a DVOM, measure voltage at ECM connector terminals No. 10 and 18. If battery voltage is present, circuit is okay. If battery voltage is not present, go to appropriate A/C SYSTEM INSPECTION procedure.

NOTE: If after all testing procedures have been completed, system is still inoperative, substitute ECM with known good unit and retest.