GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2008 🢒 LaCrosse 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 HVAC Control Module Replacement

Removal Procedure
  1. Remove the instrument panel lower trim plate. Refer to Instrument Panel Lower Trim Plate Replacement.

    2. Object Number: 1396621 Size: SH
  2. Remove the HVAC control module mounting screws (1).

    3. Object Number: 1396877 Size: SH

    Important: Retaining clips hold the HVAC control module in place.

  3. Pull the HVAC control module rearward from the instrument panel.
  4. Disconnect the electrical connectors form the HVAC control module.
  5. Remove the HVAC control module.

Installation Procedure

    Object Number: 410369 Size: SH

    Important: The key should be in the off position when connecting the electrical connectors to ensure proper calibration.

  1. Connect the electrical connectors to the HVAC control module.

    2. Object Number: 1396877 Size: SH
  2. Install the HVAC control module.

    3. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the HVAC control module mounting screws.

    4. Tighten
    Tighten the screws to 2 N·m (18 lb in).

  4. Install the instrument panel lower trim plate. Refer to Instrument Panel Lower Trim Plate Replacement.

    5. Important: Do not adjust any controls on the HVAC control module while the HVAC control module is calibrating. If interrupted improper HVAC performance will result.

  5. Start the engine and run for 1 minute. Refer to Control Module References for programming and setup information.