Diagnostic Starting Point - Cellular Communication

Begin the system diagnosis with Diagnostic System Check - Vehicle in Vehicle DTC Information. The system check will provide the following information:

• The identification of the control modules which command the system
• The ability of the control modules to communicate through the serial data circuit
• The identification of any stored DTCs and their status

The use of the system check will identify the correct procedure for diagnosing the system and where the procedure is located.