Initial Inspection and Diagnostic Overview

1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical and electrical damage.

VISUAL INSPECTION CHART

Mechanical
^ Damaged message center indicator
^ Damaged message center switch module
^ Low engine coolant level
^ Low engine oil level
^ Low windshield washer fluid level

Electrical
^ Blown Central Junction Box (CJB) fuse(s):
^ Fuse 10 (7.5 A)
^ Fuse 36 (7.5 A)
^ Damaged wiring hamess
^ Loose or corroded connector(s)
^ Circuitry open/shorted

Message Center On-Board Diagnostic Test:

A/D Table:

Digital Port Table (Port A):

Digital Port Table (Port B):

3. If inspection reveals obvious concerns that can be readily identified, repair as required.
4. Carry out the Message Center On-Board Diagnostic Test as follows:
^ Press RANGE and SYSTEM CHECK simultaneously while turning the ignition switch from the OFF position to the RUN position.
^ The chart describes each test.
^ Press the RANGE switch to advance the message center indicator to the next test.
^ To abort the on-board diagnostic mode and return to normal operation, turn the ignition switch to the OFF position.
5. If the concern(s) remain(s) after the inspection, determine the symptom(s) and proceed to Symptom Chart. Symptom Related Diagnostic Procedures