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*BLEND/MODE/RECIRC DOOR OPERATION IMPROPER (DUAL-ZONE) (CONTINUED) For the Manual Temperature Control circuit diagrams (Refer to 24 - HEATING & AIR CONDITIONING - SCHEMAT- For a complete wiring diagram Refer to Section 8W. Possible Causes DOOR DRIVER CIRCUIT(S) SHORTED TO GROUND DOOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE DOOR DRIVER CIRCUIT SHORTED TO OTHER DOOR DRIVER CIRCUIT(S) DOOR DRIVER CIRCUIT(S) OPEN DOOR(S) BOUND UP, WARPED, WORN, DAMAGED DOOR LINKAGE(S) EXCESSIVELY WORN, DISCONNECTED, MISSING, BROKEN DOOR ACTUATOR(S) BROKEN Diagnostic Test 1. RUN THE ACTUATOR CIRCUIT TEST NOTE: Diagnose and repair all Actuator Circuit Test faults before diagnosing Calibration faults. With the DRBIII T in HVAC, select System Tests and then select Actuator Circuit Test. Allow the test to run to com- pletion before proceeding. Does the DRBIII T display any Actuator Circuit Test fault messages? Yes >> Diagnose and repair the fault(s). Refer to *ACTUATOR CIRCUIT TEST DIAGNOSTICS (DUAL-ZONE) in this Section for the diagnostic test procedure. No >> Go To 2 2. CHECK FOR DTCS IN THE A/C HEATER CONTROL NOTE: Diagnose and repair all Overcurrent DTCs 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. RUN THE HVAC DOOR RECALIBRATION TEST NOTE: Diagnose and repair all Actuator Circuit Test faults and all Overcurrent DTCs before diagnosing Cal- T in HVAC, select System Tests and then select HVAC Door Recalibration. Allow the test to run to completion before proceeding. Does the DRBIII T display any HVAC Door Recalibration fault messages? Yes >> Diagnose and repair the fault(s). Refer to the Table of Contents in this Section for a complete list of all HVAC related symptoms. No >> Go To 4 24 - 156 HVAC - ELECTRICAL DIAGNOSTICS DR/DH |