Module Communication Network

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

VISUAL INSPECTION CHART

Electrical
^ Battery Junction Box (BJB) Fuse 12 (30 A)
^ Wiring harness
^ Loose or corroded connections
^ Anti-lock brake control module
^ Electronic Automatic Temperature Control (EATC) module
^ Passive Anti-Theft System (PATS) module
^ Natural Gas Vehicle Module (NGVM)
^ Electronic Crash Sensor (ECS)
^ Driver Door Module (DDM)
^ Lighting Control Module (LCM)
^ Powertrain Control Module (PCM)

3. If the concern remains after the inspection, connect NGS Tester to the DLC located beneath the instrument panel and select the vehicle to be tested from the NGS Tester menu. If NGS Tester does not communicate with the vehicle:
^ Check that the program card is correctly installed.
^ Check that the correct version of the program card is installed.
^ Check the connections to the vehicle.
^ Check the ignition switch position.

If NGS Tester still does not communicate with the vehicle, GO to Pinpoint Test N.

4. GO to Pinpoint Test PC. System Precheck