WORK FLOW

STEP | DESCRIPTION
STEP 1 | Get detailed information about the conditions and the environment when the incident occurred. The following are key pieces of information required to make a good analysis:
WHAT | Vehicle Model, Engine, Transmission/Transaxle and the System (i.e. Radio).
WHEN | Date, Time of Day, Weather Conditions, Frequency.
WHERE | Road Conditions, Altitude and Traffic Situation.
HOW | System Symptoms, Operating Conditions (Other Components Interaction). Service History and if any After Market Accessories have been installed.
STEP 2 | Operate the system, road test if necessary. Verify the parameter of the incident. If the problem cannot be duplicated, refer to “Incident Simulation Tests”.
STEP 3 | Get the proper diagnosis materials together including:

- Power Supply Routing
- System Operation Descriptions
- Applicable Service Manual Sections
- Check for any Service Bulletins

Identify where to begin diagnosis based upon your knowledge of the system operation and the customer comments.
STEP 4 | Inspect the system for mechanical binding, loose connectors or wiring damage. Determine which circuits and components are involved and diagnose using the Power Supply Routing and Harness Layouts.
STEP 5 | Repair or replace the incident circuit or component.
STEP 6 | Operate the system in all modes. Verify the system works properly under all conditions. Check you have not inadvertently created a new incident during your diagnosis or repair steps.