Diagnostic Procedure

BLEND/MODE/RECIRC DOOR OPERATION IMPROPER - MTC SYMPTOM CHART

TEST	ACTION	APPLICABILITY
1	NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must be repaired, before diagnosing Calibration fault messages. Turn the ignition on.With the DRBIII® in HVAC, System Tests, actuate the Actuator Circuit Test.Does the DRBIII® display any Actuator Circuit Test fault messages?Yes --> Return to the Heating & A/C symptom list and choose the symptom(s).Perform BODY VERIFICATION TEST - VER 1 .No --> Go To 2	All
2	NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must be repaired before diagnosing Calibration fault messages. Turn the ignition on.With the DRBIII®, read active HVAC DTCs.Does the DRBIII® display any DTCs?Yes --> Return to the Heating & A/C symptom list and choose the symptom(s).Perform BODY VERIFICATION TEST - VER 1 .No --> Go To 3	All
3	NOTE: All Actuator Circuit Test fault messages and Overcurrent DTCs must be repaired before diagnosing Calibration fault messages. Turn the ignition on.With the DRBIII® in HVAC, System Tests, actuate the HVAC Door Recalibration Test.Does the DRBIII® display any HVAC Door Recalibration fault messages?Yes --> Return to the Heating & A/C symptom list and choose the symptom(s).Perform BODY VERIFICATION TEST - VER 1 .No --> Go To 4	All
4	Which door did customer ID as faulty? Mode Door Go To 5 Passenger Blend Door Go To 6 Driver Blend Door Go To 7 Recirculation Door Go To 8	All
5	Start the engine. Press the A/C Heater Control's power switch on. Turn the blower control to the high speed position. Turn the mode control to each door position for a minimum of 30 seconds and check for airflow from the corresponding vents. Does air flow from the correct vents for each door position? Yes --> Test Complete. No --> Go To 9	All
6	Start the engine. Press the A/C Heater Control's power switch on. Turn the blower control to the high speed position. Turn the mode control to the panel position. Move the passenger blend control to the full hot position. Move the passenger blend control to the full cold position, in 25% increments, while checking for a change in airflow air temperature coming from the passenger's panel vents. Does the airflow air temperature change with respect to the position of the blend control? Yes --> Test Complete. No --> Go To 9	All
7	Start the engine. Press the A/C Heater Control's power switch on. Turn the blower control to the high speed position. Turn the mode control to the panel position. Move the driver blend control to the full hot position. Move the driver blend control to the full cold position, in 25% increments, while checking for a change in airflow air temperature coming from the driver's panel vents. Does the airflow air temperature change with respect to the position of the blend control? Yes --> Test Complete. No --> Go To 9	All
8	Start the engine. Press the A/C Heater Control's power switch on. Turn the blower control to the high speed position. Turn the mode control to the panel position. Make sure that retire is switched off (status indicator not illuminated). Press the recirc switch on (status indicator illuminated). The sound of the air flowing through the ducts should get louder as the recirculation door opens to bring in recirc air. Does the sound of the airflow get louder after pressing the recirc switch on? Yes --> Test Complete. No --> Go To 9	All
9	Turn the ignition off. Remove the applicable door actuator from the A/C Heater Housing assembly. By hand, attempt to rotate the actuator in both directions. Does the actuator turn in either direction? Yes --> Replace the door actuator in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 . No --> Inspect for disconnected, missing, or broken door actuator linkage. Repair as necessary in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1 .	All