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Symptom: *HVAC SYSTEM TEST POSSIBLE CAUSES ATTEMPT TO COMMUNICATE WITH THE PCM CHECK FOR HVAC RELATED DTCS IN THE PCM CHECK FOR ACTIVE HVAC DTCS AND SYSTEM TEST FAULT MESSAGES CHECK FOR HVAC RELATED DTCS IN THE PCM MANUAL A/C SYSTEM TEST TEST ACTION APPLICABILITY 1 Turn the ignition on. t, attempt to communicate with the Powertrain Control Module (PCM). t able to communicate with the PCM? All Yes → Go To 2 No → Refer to the communication category for the related symptom(s). Perform BODY VERIFICATION TEST - VER 1. 2 With the DRBIII t, read Powertrain Computer DTCs. Are any HVAC related DTCs present? All Yes → Refer to the Powertrain Diagnostic Procedures Manual for the related symptom(s). No → Go To 3 413 HEATING & A/C |