Module Communications Network

1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
^ Central Junction Box (CJB)
^ Wiring harness
^ Loose or corroded connector(s)

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. Connect the scan tool to the DLC located beneath the instrument panel and select the vehicle to be tested from the scan tool menu.
5. If the scan tool does not communicate with the vehicle:
check that the program card is correctly installed
^ check the connections to the vehicle
^ check the ignition switch position
^ If the scan tool does not communicate with the vehicle, go to Pinpoint Test K. Test K: No Module/Network Communication - All Modules
6. Go to Pinpoint Test A, and CARRY OUT the DATA LINK DIAGNOSTIC TEST. Test A: Data Link Diagnostic Test