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Home >> Cadillac >> 2017 >> CTS Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 239 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> Actuator Recalibration >> HVAC Control Module Replacement >> Preferred Method (with Scan Tool)

Preferred Method (with Scan Tool)

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted, improper HVAC performance will result.
  1. Ignition OFF.
  2. Disconnect the scan tool.
  3. Install/connect the HVAC control module.
  4. Connect all previously disconnected components.
  5. Start the vehicle.
  6. With the scan tool, initiate the HVAC Actuators Learn feature of the HVAC control module Special Functions menu.
  7. Operate system and verify that no DTCs have set as current DTCs.
  8. 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.
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