B109F–PANEL MODE DOOR 2 TRAVEL RANGE TOO SMALL (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 is less than 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 Rear Mode Door is less than the low range limit.


Possible Causes
  
DOOR DRIVER ELECTRICAL CIRCUIT(S)
  
REAR MODE DOOR SEIZED, BINDING, OBSTRUCTED
  
REAR MODE 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.INSPECT ACTUATOR & HOUSING ASSEMBLY FOR A CONDITION CAUSING THE REAR MODE DOOR TO SEIZE OR BIND




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

Yes


No
  • Go To 3

3.CHECK REAR MODE DOOR TRAVEL




Does the door operate smoothly in both directions over the entire span of travel?

Yes
  • Replace the Rear Mode Door Actuator in accordance with the Service Information. Then, Go To 4.


No

4.RUN THE ACTUATOR CALIBRATION TEST




Does the scan tool display: B109F–PANEL MODE DOOR 2 TRAVEL RANGE TOO SMALL?

Yes


No