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Actuator Recalibration (C67)

Preferred Method (with Scan Tool)

NOTE:

Do not operate any HVAC controls while the HVAC control module is calibrating as this may interrupt the process. If interrupted, improper HVAC performance will result.

  1. Using a scan tool, perform the HVAC Actuators Learn in the HVAC Control Module.
  2. Follow the scan tool directions to complete the procedure.
  3. Operate the system and verify that no DTCs have set as current DTCs.
  4. If DTC B101E 4B is set after attempting the actuator recalibration procedure, perform the following:
    1. Verify which actuator does not have a scan tool learn status parameter status of complete.
    2. Verify the unlearned actuator is physically rotating - A common cause of DTC B101E 4B is an actuator that is electrically OK but fails to physically rotate (e.g. stripped gears).
    3. If the unlearned actuator is not physically rotating, replace the actuator, otherwise replace the HVAC control module.

Alternate Method (without Scan Tool)

NOTE:

Do not operate any HVAC controls while the HVAC control module is calibrating as this may interrupt the process. If interrupted, improper HVAC performance will result.

  1. Ignition OFF/ Vehicle OFF.
  2. Remove the HVAC control module fuse for a minimum of 10 s.
  3. Install the HVAC control module fuse.
  4. Start the vehicle.
  5. Wait 40 s for the HVAC control module to self-calibrate.
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