For 1990-2009 cars only
Diagnostic Starting Point - Cellular Communication for Buick Terraza Ext. 2005
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.
