Self-Diagnostic System

Connect New Generation Star (NGS) tester to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. Using NGS tester, preform data link diagnostics test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in MODULE COMMUNICATIONS NETWORK - TOWN CAR article. If NGS tester responds with CKT914 or CKT915=ALL ECUS NO RESP/NOT EQUIP, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - TOWN CAR article. If NGS tester displays NO RESP/NOT EQUIP for Driver's Door Module (DDM), perform TEST A: NO COMMUNICATION WITH DRIVER'S DOOR MODULE under SYSTEM TESTS.

If NGS tester responds with SYSTEM PASSED, retrieve and record continuous DTCs. Erase continuous DTCs. Using NGS tester, perform DDM self-test. Perform appropriate test under SYSTEM TESTS in accordance with DTC retrieved. See DRIVER'S DOOR MODULE DIAGNOSTIC TROUBLE CODE INDEX table. Codes listed in this table are only for testing covered in this article. For complete DTC listing, see MODULE COMMUNICATIONS NETWORK - TOWN CAR article. If no DTCs are retrieved, repair by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.

DRIVER'S DOOR MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC ⁽¹⁾

Description

Perform Test

B1342

ECU Defective

⁽²⁾

B1402

Driver's Door Window Switch Down Circuit Open

B1549

Power Window Switch 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 - TOWN CAR article.

⁽²⁾	Using NGS tester, retrieve and document all continuous DTCs. Perform Driver's Door Module (DDM) self-test. If DTC B1342 is retrieved again, replace DDM.