Inspection & Verification

NOTE: When performing data link diagnostic test, the NGS tester may display bus circuits 4-RA1 and 5-RA1 as circuits No. 914 and 915. The NGS tester may also display ISO circuit 8-DA1 as circuit No. 70.

Verify customer's original problem by operating system in question. Inspect vehicle for any obvious electrical component wiring or connector damage. Inspect connectors for loose, damaged or corroded terminals. Check related fuses for system in question.
Inspect 16-pin Data Link Connector (DLC) pins for damage. The DLC is located below driver's side of instrument panel, to right of steering column. If pins are okay, go to next step. If pins are damaged, repair as necessary and proceed to next step.
If problem is still present after performing inspection, connect New Generation Star (NGS) tester to DLC. Select vehicle to be tested from NGS tester menu. If NGS tester communicates with vehicle, go to next step. If NGS tester does not communicate with vehicle, ensure program card is properly installed. Check NGS tester cable connections and ensure ignition is in RUN position. If NGS tester still does not communicate with vehicle, refer to NGS tester manual.
Turn ignition on. Rotate dial on NGS tester to menu item DATA LINK DIAGNOSTIC and press trigger. A test will be performed on bus (circuits No. 914 and 915) for module communications network and ISO 9141 communication network (circuit No. 70). If scan tool displays, CKT 914, CKT 915 or CKT 70 = ALL MODULES NO RESPONSE/NOT EQUIPPED, see DATA LINK DIAGNOSTIC TEST . If NGS tester responds with SYSTEM PASSED, return to article that directed you here and continue diagnosis.