Control Module HVAC: Testing and Inspection

Compressor Control Unit Input Tests

NOTE:
- Make sure all connectors are clean and tight.
- Make all tests from the wire side of the connector with a digital multi-tester.
- Any abnormality found during these tests must be corrected before continuing. If all tests produce the desired results, substitute a known-good control unit and retest.






Perform the following tests with the A/C control unit's 12P connector disconnected, and the ignition switch, blower switch, and A/C switch ON.






Perform the following tests with A/C control unit connected, engine running and the A/C system turned ON.