Compressor Clutch Relay: Testing and Inspection

System Schematic:

To test the Air Conditioning Relay, located in the engine compartment, proceed as follows.


1. Remove the Air Conditioning Relay.
2. Test terminals 2 and 4 for continuity, there should be continuity.
3. Apply 12v power across terminals 2 and 4.
4. Test terminals 1 and 3 for continuity, there should be continuity.
5. If the relay fails either test replace the relay.



HARNESS TEST


1. With the ignition switch in the off position, disconnect the ECU connector. Turn on the ignition and A/C switches. Connect a voltmeter between ECU harness connector terminals 7, 65 and ground and check for supply voltage.

Voltage: System Voltage.

If any of the previous tests produce unsatisfactory results, the harness will need to be repaired or replaced. Once repairs have been completed, confirm that the repair has corrected the problem.

If the trouble returns, it is possible that there is an intermittent failure of the component or the ECU. Check for looseness at all harness junctions and test for an intermittent failure.