GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 DeVille 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 HVAC Control Module Replacement

Removal Procedure

    Object Number: 474633 Size: SH
  1. Remove the instrument panel center trim plate (1). Refer to Instrument Panel Center Trim Panel Replacement.
  2. Depress and hold the locking tabs, located on the 4 corners of the HVAC control assembly.

    3. Pull the HVAC control away from the instrument panel.

  3. Disconnect the electrical connectors from the HVAC control.

    4. Object Number: 474755 Size: SH
  4. Remove the HVAC control assembly (1) from the instrument panel.

Installation Procedure

    Object Number: 474755 Size: SH

    Important: The ignition must be in the OFF position when connecting the electrical connectors to ensure proper actuator calibration.

  1. Connect the HVAC electrical connectors.
  2. Install the HVAC control assembly (1) into the instrument panel.

    3. Push the HVAC control assembly (1) into the instrument panel opening in order to engage the retainers.


    Object Number: 474633 Size: SH
  3. Install the instrument panel center trim plate (1). Refer to Instrument Panel Center Trim Panel Replacement.

    4. Important: 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.

    The engine must be running for proper calibration to occur.

  4. Start the engine and let run for one minute.
  5. Refer to Control Module References for programming and setup information.