With GEM

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

VISUAL INSPECTION CHART

Mechanical
^ Key-in-ignition warning switch
^ Door open warning lamp switch
^ Safety belt warning indicator switch

Electrical
^ Fuse(s)
^ Damaged wiring harness
^ Loose or corroded connections
^ Gem

3. If the concern remains after the inspection, connect the New Generation STAR (NGS) Tester to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the NGS menu. If the NGS does not communicate with the vehicle:
^ check that the program card is properly installed.
^ check the connections to the vehicle.
^ check the ignition switch position.

4. If the NGS still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.
5. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
^ CKT914, CKT915 or CKT7O = ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network.
^ NO RESP/NOT EQUIP for GEM, go to Pinpoint Test E. Test E: No Communication With the Module-GEM
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform self- test diagnostics for the Generic Electronic Module (GEM).

6. If the DTCs retrieved are related to the concern, go to GEM Module Diagnostic Trouble Code (DTC) Index to continue diagnostics. GEM Diagnostic Trouble Code (DTC) Index
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. With Gem