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Symptom: REAR BLEND POT CIRCUIT OPEN (ACTIVE) - MTC When Monitored and Set Condition: REAR BLEND POT CIRCUIT OPEN (ACTIVE) - MTC When Monitored: With the ignition on. Set Condition: This DTC will set if the A/C - Heater Control Module sees voltage above 4.88 volts on the Rear Temperature Feedback Signal circuit. POSSIBLE CAUSES 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE CHECK REAR TEMPERATURE FEEDBACK SIGNAL CIRCUIT VOLTAGE REAR TEMPERATURE FEEDBACK SIGNAL CIRCUIT OPEN A/C - HEATER CONTROL MODULE 5 VOLT SUPPLY CIRCUIT SHORTED TO REAR TEMPERATURE FEEDBACK SIGNAL CIRCUIT REAR TEMPERATURE RETURN CIRCUIT OPEN REAR BLEND POTENTIOMETER A/C - HEATER CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition off. All Yes → Repair the 5 Volt Supply circuit for a short to voltage. Perform BODY VERIFICATION TEST - VER 1. No → Go To 2 2 Turn the ignition off. All Above 5.1 Volts Repair the Rear Temperature Feedback Signal circuit for a short Below 0.25 Volts Between 0.25 & 5.1 Volts 677 HEATING & A/C |