Begin the IP or DIC system diagnosis with the Diagnostic System Check - Instrument Cluster or Diagnostic System Check - Driver Information Systems . The Diagnostic System Check will provide the following information:
| • | The identification of the control module(s) which command the system. |
| • | The ability of the control module(s) to communicate through the serial data circuit. |
| • | The identification of any stored diagnostic trouble codes (DTCs) and their status. |
The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.
Begin the audible warning system diagnosis by reviewing the system Operation. Reviewing the Operation information will help you determine the correct symptom diagnostic procedure when an audible warning malfunction exists. Reviewing the Operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms in order to identify the correct procedure for diagnosing the audible warning system and where the procedure is located.
