High Pressure Sensor / Switch: Testing and Inspection

Before performing diagnosis of the A/C high pressure switch, verify that the refrigerant system has the correct refrigerant charge.

For circuit descriptions and diagrams, refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention, as well as pin-out and location views for the various wire harness connectors, splices and grounds.

1. Disconnect and isolate the battery negative cable.
2. Disconnect the wire harness connector from the A/C high pressure switch.
3. Check for continuity between the two terminals of the A/C high pressure switch. There should be continuity. If OK, test and repair the A/C high pressure switch circuit as required. If not OK, replace the switch.