Module Communications 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
- Fuses
- Wiring harness
- Loose or corroded connections
- Anti-lock brake control module
- Audio Control Unit (ACM)
- Driver Door Module (DDM)
- Driver Seat Module (DSM)
- Electronic Automatic Temperature Control (EATC) module
- Restraint Control Module (RCM)
- Lighting Control Module (LCM)
- Next Generation Speed Control (NGSC) servo
- Powertrain Control Module (PCM)
- Remote Emergency Satellite Cellular Unit (RESCU) module
- Vehicle Dynamics Module (VDM)
- Virtual Instrument Cluster (VIC)

3. If the concern remains after the inspection, connect the scan tool to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool does not communicate with the vehicle:
- Check that the program card is properly installed.
- Check that the correct version of the program card is installed.
- Check the connections to the vehicle.
- Check the ignition switch position.

If the scan tool still does not communicate with the vehicle, GO to Pinpoint Test P. Test P: No Module/Network Communication

4. GO to Pinpoint Test PC. Pinpoint Test PC (Precheck)