Manual Temperature Control

B105C - Recirculation Door Travel Range Too Small

For a complete wiring diagram, refer to.

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 recirculation door is less than the low range limit.






Test Step 1 - Check for an Active Control Circuit/Performance and Control Circuit Open DTCs

• Turn the ignition ON.

• With the scan tool, read active HVAC DTCs.

Does the scan tool display any active control circuit/performance or control circuit open DTCs?

Yes

• Diagnose and repair the DTCs. If present, diagnose and repair all rear blend and rear mode door control circuit/performance DTCs first, all other control circuit/performance DTCs second, and all control circuit open DTCs last. Refer to the table of contents in this section for a complete list of all HVAC related symptoms.

No

• Go to Test Step 2 => [ Test Step 2 - Inspect Actuator and Housing Assembly for a Condition
Causing the Door to Seize or Bind ]

Test Step 2 - Inspect Actuator and Housing Assembly for a Condition Causing the Door to Seize or Bind

• Turn the ignition OFF.

• Inspect the actuator and the housing assembly for a condition causing the door to seize or bind.

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

Yes

• Repair as necessary.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Go to Test Step 3 => [ Test Step 3 - Check Recirculation Door Travel ]

Test Step 3 - Check Recirculation Door Travel

• Remove the recirculation door actuator from the A/C heater housing assembly.

• By hand, attempt to rotate the door in both directions. The door should operate smoothly in both directions over approximately 70 degrees of travel.

Does the door operate smoothly in both directions over approximately 70 degrees of travel?

Yes

• Replace the recirculation door actuator.Then, Go To Test Step 4 => [ Test Step 4 - Run the Actuator Calibration Test ].

No

• Repair as necessary.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

Test Step 4 - Run the Actuator Calibration Test

• Turn the ignition ON.

• With the scan tool, select system tests and then select actuator calibration test. When the test is complete, select view DTCs.

Does the scan tool display this DTC as active?

Yes

• Replace the A/C heater control.

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test

No

• Perform the HVAC Verification Test. Refer to => Non-DTC Based Diagnostics. HVAC Verification Test