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Symptom: TX FAILURE (ACTIVE) When Monitored and Set Condition: TX FAILURE (ACTIVE) When Monitored: When the ignition is on. Set Condition: This DTC will set if the A/C - Heater Control Module is unable to send a message. POSSIBLE CAUSES ATTEMPT TO COMMUNICATE WITH THE HVAC MODULE CHECK FOR ADDITIONAL HVAC DTCS ATTEMPT TO COMMUNICATE WITH THE PCM AND CTM A/C - HEATER CONTROL MODULE INTERMITTENT WIRING PROBLEM TEST ACTION APPLICABILITY 1 Turn the ignition on. t, attempt to communicate with the HVAC Module. Was the DRBIII t able to I/D or communicate with the HVAC Module? All Yes → No → Refer to the Communication category for the related symptom(s). 2 Turn the ignition on. t, read HVAC DTCs. Does the DRBIII t display additional HVAC DTCs? All Yes → Return to the symptom list and choose the symptom(s). No → 3 Turn the ignition on. t, attempt to communicate with the PCM. With the DRBIII t, attempt to communicate with the CTM. Was the DRBIII t able to I/D or communicate with the PCM and the CTM? All Yes → No → Refer to the Communication category for the related symptom(s). 213 HEATING & A/C |