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Symptom: *HVAC SYSTEM TEST - MTC POSSIBLE CAUSES ATTEMPT TO COMMUNICATE WITH THE PCM, THE BCM, AND THE IPM CHECK FOR HVAC RELATED DTCS IN THE POWERTRAIN CONTROL MODULE (PCM) CHECK FOR BODY CONTROL MODULE (BCM) DTCS CHECK FOR INTEGRATED POWER MODULE (IPM) DTCS CHECK FOR ACTIVE HVAC DTCS AND SYSTEM TESTS FAULT MESSAGES CHECK FOR HVAC RELATED DTCS IN THE PCM PERFORM MANUAL A/C SYSTEM TEST TEST ACTION APPLICABILITY 1 Turn the ignition on. t, attempt to communicate with the Powertrain Control Module (PCM). t, attempt to communicate with the Body Control Module (BCM). With the DRBIII t, attempt to communicate with the Integrated Power Module (IPM). t able to communicate with the PCM, the BCM, and the IPM? 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 Control Module (PCM) DTCs. Does the DRBIII t display any HVAC related DTCs? All Yes → Refer to the Powertrain Diagnostic Procedures Manual for the related symptom(s). No → Go To 3 3 With the DRBIII t, read Body Control Module (BCM) DTCs. Does the DRBIII t display any DTCs? All Yes → Refer to the appropriate category for the related symptom(s). Perform BODY VERIFICATION TEST - VER 1. No → Go To 4 4 With the DRBIII t, read Integrated Power Module (IPM) DTCs. Does the DRBIII t display any DTCs? All Yes → For Integrated Power Module (IPM) DTCs related to the front blower relay circuits, refer to the Heating & A/C category. For all No → Go To 5 649 HEATING & A/C |