Symptoms - Cellular Communication

Symptoms - Cellular Communication

Note: The following steps must be completed before using the symptom table.

1. Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) before using the Symptom Tables in order to verify that all of the following are true:

* There are no DTCs set.
* The control modules can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to OnStar Description and Operation (OnStar).

Visual/Physical Inspection

* Inspect for aftermarket devices which could affect the operation of the Radio/Audio System. Refer to Checking Aftermarket Accessories (Checking Aftermarket Accessories).
* Inspect for easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections).

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

* Bluetooth Malfunction (Bluetooth Malfunction)
* OnStar Global Positioning System (GPS) Data Not Current or Inaccurate (OnStar Global Positioning System (GPS) Data Not Current or Inaccurate)
* OnStar Microphone Malfunction (OnStar Microphone Malfunction)
* OnStar Audio Malfunction (OnStar Audio Malfunction)
* OnStar Button LED Malfunction (OnStar Button LED Malfunction)
* OnStar Call Center Remote Function Requests Malfunction (OnStar Call Center Remote Function Requests Malfunction)
* OnStar Button Malfunction (OnStar Button Malfunction)
* Unable to Contact OnStar Call Center (Unable to Contact OnStar Call Center)
* OnStar Voice Recognition Malfunction (OnStar Voice Recognition Malfunction)
* OnStar Steering Wheel Control Functions Malfunction (OnStar Steering Wheel Control Functions Malfunction)