Flow of Diagnosis

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

Electrical
- Fuses
- Wiring harness
- Loose or corroded connections
- Anti-lock brake control module
- Rear Air Suspension Module (RASM)
- Audio Control Unit (ACM) (optional)
- Driver Door Module (DDM)
- Driver Seat Module (DSM) (optional)
- Electronic Crash Sensor (ECS) module
- Lighting Control Module (LCM)
- Hybrid Electronic Cluster (HEC)
- Powertrain Control Module (PCM)
- Next Generation Speed Control (NGSC) servo
- Electronic Automatic Temperature Control (EATC) module

3. If the concern remains after the inspection, connect New Generation STAR (NGS) Tester to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from NGS Tester menu. If NGS Tester 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 NGS Tester still does not communicate with the vehicle, go to Pinpoint Test N. Pinpoint Tests

4. Go to Pinpoint Test PC. System Precheck