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A/C On (A/C Request) Switch Test

WARNING: This page is about a different car, the 1997 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine and allow to idle. If a scan tool is available, scan A/C request parameter. Slide mode selector for A/C back and forth between ON and OFF positions. Scan status should change.
  2. If scan tool is not available or scan status does not change, measure voltage between ground and PCM A/C request terminal. For wiring schematics, see appropriate diagram in the WIRING DIAGRAMS article.
  3. With A/C mode selector in the ON position, battery voltage should be present. If battery voltage is not present, check for open between A/C mode select switch and PCM A/C request terminal, low A/C refrigerant level causing low pressure switch to open, bad A/C fuse or bad A/C mode select switch.
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