The multi-band antenna is on the roof of the vehicle. The antenna is used for AM-FM radio, OnStar, the SiriusXM satellite radio service system, and GPS (Global Positioning System), if the vehicle has these features. Keep the antenna clear of obstructions for clear reception.
If the vehicle has a sunroof, and it is open, reception can also be affected.
Radio Reception
Audio PlayersMeasuring Voltage
Special Tools EL-39200 Digital Multimeter (DMM)For equivalent regional tools, refer toSpecial Tools.Caution:Refer toTest Probe Caution.The following procedure measures the voltage at a selected point in a circuit.Disconnect the electrical harness connector for the circuit being tested, if necessary. ...