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Air Conditioning Diagnostic System Check

  1. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, on hood release bracket. If scan tool powers up, go to next step. If scan tool does not power up, perform SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition on. Using scan tool, attempt to communicate with Heating Ventilation and Air Conditioning (HVAC) control module, Body Control Module (BCM) and Powertrain Control Module (PCM). If scan tool communicates with HVAC control module, BCM and PCM, go to next step. If scan tool does not communicate with HVAC control module, BCM and PCM, diagnose communication problem. See TEST F: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Using scan tool, select HVAC control module, BCM and PCM display DTCs function. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair air conditioning system by symptom. See AUTOMATIC A/C-HEATER SYSTEMS - INTRIGUE article in AIR CONDITIONING & HEATING.
  4. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", diagnose communication problem. See TEST F: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  5. If scan tool does not display DTC B10XX, go to next step. If scan tool displays DTC B10XX, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  6. Diagnose any other DTCs that are set. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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