Flow of Diagnosis

1. Verify the customer concern by operating the Passive Anti-Theft System (PATS).
2. Visually inspect for obvious signs of mechanical and electrical damage.

VISUAL INSPECTION CHART

Mechanical
^ Ignition lock cylinder
^ Encoded ignition key
^ A non-encoded ignition key being used
^ A non-programmed encoded ignition key

Electrical
^ Fuse(s)
^ Wiring harness
^ Loose or corroded connections
^ Ignition switch
^ Transceiver

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.
5. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
^ CKT 914, CKT 915 or CKT 70 = ALL ECUS NO RESP/NOT EQUIP, refer to Information Bus.
^ NO RESP/NOT EQUIP for PATS, go to Pinpoint Test H. H: No Communication With the Module - PATS
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform self-test diagnostics for the PATS module.
6. If the DTCs retrieved are related to the concern, go to the PATS Diagnostic Trouble Code (DTC) Index PATS Diagnostic Trouble Code (DTC) Index to continue diagnostics.
7. If no DTCs related to the concern are retrieved, proceed to Pinpoint Test PC PC: Retrieve Diagnostic Trouble Codes to continue diagnostics.