A Preliminary Information

IMPORTANT: The following steps must be completed before using the symptom tables.

1. Perform the A Diagnostic System Check - Instrument Cluster or A Diagnostic System Check - Driver Information Systems before using the symptom tables in order to verify that all of the following are true:
^ There are no DTCs set.
^ The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
^ Instrument Cluster Circuit Description
^ Driver Information Center (DIC) or Message Center Description
^ Driver In formation Center (DIC) or Message Center Operation
^ Driver Information Center (DIC) or Message Center Circuit Description

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the instrument panel cluster (IPC) or the driver information center (DIC). Refer to Checking Aftermarket Accessories in Diagrams.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
^ Inspect for proper fluid levels before beginning any diagnosis.

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