Circuit/System Verification

NOTE:

It is necessary to have the vehicle in a quiet, open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.

Ignition ON.
Verify that DTC B2455 is set.
- If DTC B2455 is not set
  Refer to OnStar Microphone Malfunction .
- If DTC B2455 is set
Verify that your voice is heard clearly by the OnStar Call Center after completing a blue button press.
- If your voice can not be heard clearly
  Refer to Circuit/System Testing .
- If your voice can be heard clearly
All OK.