Data Link Diagnostic Test

NOTE: International Standards Organization (ISO) 9141 diagnostic communications network circuit is the Gray/Black wire connected to terminal No. 7 on Data Link Connector (DLC). Bus (+) circuit is the Gray/Red wire connected to terminal No. 2 on DLC. Bus (-) circuit is the Blue/Red wire connected to terminal No. 10 on DLC.

NOTE: Remote Emergency Satellite Cellular Unit (RESCU) module, Driver's Seat Module (DSM) and Steering Column Lock Module (SCLM) will fail data link diagnostic test if vehicle is not equipped with that module(s). Vehicles with voice activated cellular phone are equipped with a RESCU module. Vehicles with memory seats are equipped with a DSM. Vehicles with a manual transmission are equipped with a SCLM. SCLM will not communicate until SCL actuator is activated. To activate SCL actuator, remove key from ignition and open driver's door. SCL activator will remain activated for 30 minutes.

Connect New Generation Star (NGS) tester to Data Link Connector (DLC), if not already connected. DLC is located below driver's side of instrument panel, to right of steering column. Select vehicle to be tested from NGS tester menu. Go to next step.
Turn ignition switch to RUN position. Rotate dial on NGS tester to menu item DIAGNOSTIC DATA LINK and press trigger. A test will be performed on the bus network and the ISO 9141 network. Go to next step.
If NGS tester displays CKT 914 (+) = SYSTEM PASSED and CKT 915 (-) = SYSTEM PASSED, module communications network is okay. If NGS tester displays CKT 70 = SYSTEM PASSED, ISO 9141 communication link is operating properly. Repair communication concern by symptom. See SYMPTOM INDEX table under SYSTEM TESTS to continue diagnosis.
If NGS tester does not display CKT 914 (+) = SYSTEM PASSED, CKT 915 (-) = SYSTEM PASSED and CKT 70 = SYSTEM PASSED, perform the following as applicable:
- If no response from NGS tester, perform TEST O: NO MODULE/NETWORK COMMUNICATION - NO POWER TO NGS TESTER under SYSTEM TESTS.
- If NGS tester displays CKT 70, CKT 914 and/or CKT 915 = SOME ECUS NO RESP/NOT EQUIP, repair communication concern by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.
- If NGS tester displays CKT 70 = ALL ECUS NO RESP/NOT EQUIP, perform TEST C: RESTRAINT CONTROL MODULE DOES NOT RESPOND TO NGS TESTER under SYSTEM TESTS.
- If NGS tester displays CKT 914 = ALL ECUS NO RESP/NOT EQUIP, perform TEST N: NO MODULE/NETWORK COMMUNICATION - SCP BUS LINK under SYSTEM TESTS.
- If NGS tester displays CKT 915 = ALL ECUS NO RESP/NOT EQUIP, perform TEST N: NO MODULE/NETWORK COMMUNICATION - SCP BUS LINK under SYSTEM TESTS.
- If module in question is NO RESPONSE/NOT EQUIPPED, repair communication concern by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.
- If module in question is NO RESPONSE ON CKT 914 (BUS +), repair communication concern by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.
- If module in question is NO RESPONSE ON CKT 915 (BUS -), repair communication concern by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.