Body Diagnostic Procedures - Introduction, Overviews, Disclaimers, Safety & Warnings: Introduction: Notes

This manual contains all of the specifications, instructions, and graphics needed to diagnose body system problems. The diagnostics in this manual are based on the failure condition or symptom being present at the time of diagnosis.

Please follow the recommendations below when choosing your diagnostic path.

1. First make sure that the DRBIII® is communicating with the appropriate modules; i.e., if the DRBIII® displays a "No Response" or a "Bus +/- Signals Open" condition, you must diagnose that condition first.
2. Read DTCs (diagnostic trouble codes) with the DRBIII®.
3. If no DTCs are present, identify the customer complaint.
4. Once the DTC or customer complaint is identified, locate the matching test and begin diagnosing the symptom.
   • All component location views are in COMPONENT LOCATIONS .
   • All connector pinouts are in CONNECTOR PINOUTS .
   • All schematics are in SCHEMATIC DIAGRAMS .
   • An * placed before the symptom description indicates a customer complaint without a DTC.

When repairs are required, refer to the appropriate service information for the proper removal, repair, and installation procedures.

Diagnostic procedures change every year. New diagnostic systems may be added: carryover systems may be enhanced. READ THIS MANUAL BEFORE TRYING TO DIAGNOSE A VEHICLE DIAGNOSTIC TROUBLE CODE. It is recommended that you review the entire manual to become familiar with all the new and changed diagnostic procedures.

This book reflects many suggested changes from readers of past issues. After using this book, if you have any comments or suggestions, please fill out the form in the back of this book and mail it back to us.