Sierra 1500 2WD V8-5.3L Hybrid (2004)
1. Remove the instrument panel accessory trim plate.
2. Remove the screws from the HVAC control module.
3. Depress the control assembly retaining tabs and remove the HVAC control module from the instrument panel.
4. Disconnect the electrical connectors from the HVAC control module.
INSTALLATION PROCEDURE
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. Install the HVAC control module into the instrument panel, ensuring that the HVAC control module retaining tabs lock into place.
NOTE: Refer to Fastener Notice in Service Precautions.
3. Install the screws from the HVAC control module.
Tighten
Tighten the screws to 1.9 N.m (17 lb in).
4. Install the instrument panel accessory trim plate
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 vehicle and let run for one minute.