The HVAC Display Is Not Indicated

The HVAC display is not indicated

Probable cause: Communication problem between the climate control unit and the Audio-HVAC display unit (without navigation) or the Audio HVAC subdisplay unit (with navigation)

Do the audio communication line circuit troubleshooting Audio Communication Line Circuit Troubleshooting

Also check for

HVAC DTCs Initial Inspection and Diagnostic Overview

Also check for

Poor or loose connections at the terminals