Self-Diagnostic System

CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Using NGS tester, perform data link diagnostic test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in MODULE COMMUNICATIONS NETWORK - EXCURSION article. If NGS tester displays CKT 914, CKT 915 or CKT 70=ALL MODULES NO RESP/NOT EQUIP, repair module concern. See MODULE COMMUNICATIONS NETWORK - EXCURSION article. If NGS tester displays NO RESP/NOT EQUIP for Generic Electronic Module (GEM), perform TEST B: NO COMMUNICATION WITH GENERIC ELECTRONIC MODULE under SYSTEM TESTS. If NGS tester displays SYSTEM PASSED, retrieve and record continuous DTCs. Erase continuous DTCs. Using NGS tester, perform GEM self-test. If GEM DTCs are retrieved, perform appropriate test. See GENERIC ELECTRONIC MODULE DTC DEFINITIONS table. Codes listed in this table are only for testing covered in this article. For complete DTC listing, see MODULE COMMUNICATIONS NETWORK - EXCURSION article. If no DTCs are retrieved, repair by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.

GENERIC ELECTRONIC MODULE DTC DEFINITIONS

DTC⁽¹⁾

Description

Perform Test

B1342

ECU Defective

⁽²⁾

B1345

Rear Defogger Input Circuit Short To Ground

B1347

Rear Defogger Relay Circuit Failure

B1349

Rear Defogger Relay Short To Voltage

⁽¹⁾	Codes listed in this table are only for testing covered in this article. For complete DTC listing, see MODULE COMMUNICATIONS NETWORK - EXCURSION article.

⁽²⁾	Using NGS tester, retrieve and record all DTCs. Perform Generic Electronic Module (GEM) self-test. If DTC B1342 us retrieved again, replace GEM.