B10A7–LEFT BLEND DOOR TRAVEL RANGE TOO LARGE (ATC)

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


The A/C Heater Control calibrates each actuator individually. Automatic calibration occurs upon power up after installing a new A/C Heater Control. Manual calibration occurs by sending a command with the scan tool. The purpose of actuator calibration is to determine the total span of door travel between physical stops. To calibrate the actuator, the A/C Heater Control first moves the door to its soft stop, and then counts the number of pulses it takes to move the door to its other stop. An expected range of span is stored in the control's memory. If the measured calibration value exceeds the expected range for this actuator, this DTC will set. Note that the control clears all stored calibration faults at the beginning of the calibration procedure.


  • When Monitored:

    During actuator calibration.

  • Set Condition:

    If the total span of the Left Blend Door exceeds the high range limit.


Possible Causes
  
DOOR DRIVER ELECTRICAL CIRCUIT(S)
  
LEFT BLEND DOOR OR A/C HEATER HOUSING COMPONENTS WARPED, WORN, DAMAGED, MISSING, BROKEN
  
LEFT BLEND DOOR ACTUATOR
  
A/C HEATER CONTROL
  



Diagnostic Test

1.CHECK FOR ACTIVE CONTROL CIRCUIT/PERFORMANCE & CONTROL CIRCUIT OPEN DTCs




Does the scan tool display any active: XXXX CONTROL CIRCUIT/PERFORMANCE or XXXX CONTROL CIRCUIT OPEN DTCs?

Yes
  • Diagnose and repair the DTC(s). If present, diagnose and repair all Control Circuit/Performance DTCs before diagnosing Control Circuit Open DTCs. Refer to the Table of Contents in this Section for a complete list of HVAC related symptoms.


No
  • Go To 2

2.CHECK FOR A BROKEN LEFT BLEND DOOR ACTUATOR





Does the actuator turn in either direction?

Yes


No
  • Go To 3

3.CHECK THE LEFT BLEND DOOR & A/C HEATER HOUSING FOR WARPED, WORN, DAMAGED, MISSING, & BROKEN COMPONENTS



Are there any physical or mechanical problems with the door or housing?

Yes


No
  • Replace the Left Blend Door Actuator in accordance with the Service Information. Then, Go To 4.

4.RUN THE ACTUATOR CALIBRATION TEST




Does the scan tool display: B10A7–LEFT BLEND DOOR TRAVEL RANGE TOO LARGE?

Yes


No