High Pressure Sensor / Switch: Testing and Inspection

Before performing diagnosis of the high pressure cut-off switch, verify that the refrigerant system has the correct refrigerant charge. See Refrigerant System Charge for the procedures.
1. Disconnect and isolate the battery negative cable.
2. Unplug the high pressure cut-off switch wire harness connector from the switch.
3. Check for continuity between the two terminals of the high pressure cut-off switch. There should be continuity. If OK, test and repair the A/C switch sense circuit as required. If not OK, replace the faulty switch.