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BLEND CALIBRATION FAULT (DUAL-ZONE) (CONTINUED) 2. CHECK FOR DTCS IN THE A/C HEATER CONTROL NOTE: Diagnose and repair Overcurrent faults before diagnosing Calibration faults. T , read HVAC DTCs. Does the DRBIII T display any DTCs? Yes >> Diagnose and repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of HVAC related symptoms. No >> Go To 3 3. CHECK THE RESISTANCE BETWEEN THE (C34) COMMON DOOR DRIVER CIRCUIT & THE (C33) Turn the ignition off. Disconnect the A/C Heater Control C1 harness connector. Measure the resistance between the (C34) Common Door Driver cir- Is the resistance above 70.0 ohms? Yes >> Go To 4 No >> Go To 6 24 - 8 HVAC - ELECTRICAL DIAGNOSTICS DR/DH |