Cellular and GPS Antennas

Avoid placing items over or near the antenna to prevent blocking cellular and GPS signal reception. Cellular reception is required for OnStar to send remote signals to the vehicle.

    See also:

    Interior
    The Sierra showcases two different interior designs. Work Truck and SLE models are more utility-minded, with large controls and door handles that can be operated while wearing gloves. The SLT offe ...

    Inserting a CD(s) (Six-Disc CD Player)
    LOAD : Press to load CDs into the CD player. This CD player holds up to six CDs. To insert one CD: 1. Press and release the LOAD button. 2. Wait for the message to insert the disc. 3. Load a CD. I ...

    Auxiliary Taillamp
    To replace one of these lamps: 1. Open the liftgate. See Liftgate on page 2‑9. 2. Remove the interior trim access panel. A. Attachment Nuts B. Retaining Hook 3. Remove the five attachment ...