Self-Diagnostic System

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.

NOTE: Before performing self-diagnostics, perform TROUBLE SHOOTING .

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, perform data link diagnostics test. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in MODULE COMMUNICATIONS NETWORK - LS article. If NGS tester responds with CKT914, CKT915 or CKT70=ALL ECUS NO RESP/NOT EQUIP, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - LS article. If NGS tester displays NO RESP/NOT EQUIP for Front Electronic Module (FEM), perform TEST A: NO COMMUNICATION WITH FRONT ELECTRONIC MODULE under SYSTEM TESTS. If NGS tester displays NO RESP/NOT EQUIP for Rear Electronic Module (REM), perform TEST B: NO COMMUNICATIONS WITH REAR ELECTRONIC MODULE under SYSTEM TESTS. If NGS tester displays NO RESP/NOT EQUIP for Driver's Door Module (DDM), perform TEST C: 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 FEM, REM and DDM self-tests. If any DTCs are retrieved, perform appropriate test in accordance with DTC retrieved. See DRIVER'S DOOR MODULE DIAGNOSTIC TROUBLE CODE INDEX ,FRONT ELECTRONIC MODULE DIAGNOSTIC TROUBLE CODE INDEX and/or REAR ELECTRONIC MODULE DIAGNOSTIC TROUBLE CODE INDEX table(s). Codes listed in these tables are only for testing covered in this article. For complete DTC listing, see MODULE COMMUNICATIONS NETWORK - LS 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⁾

B1400

Driver's Window One-Touch Down Window Relay Circuit Short To Voltage

B1405

Driver's Power Window Down Circuit Short To Voltage

B1408

Driver's Power Window Up Circuit Short To Voltage

B1416

Left Rear Power Window Motor Circuit Short To Voltage

B1420

Passenger's Power Window Motor Circuit Short To Voltage

B1424

Right Rear Power Window Motor Circuit 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 - LS article.

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

FRONT ELECTRONIC MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC ⁽¹⁾

Description

Perform Test

B1342

ECU Defective

⁽²⁾

B2214

Passenger's Front Window Up Switch Short To Voltage

B2215

Passenger's Front Window Down 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 - LS article.

⁽²⁾	Using NGS tester, retrieve and document all continuous Front Electronic Module (FEM) DTCs. Perform FEM self-test. If DTC B1342 is retrieved again, replace FEM.

REAR ELECTRONIC MODULE DIAGNOSTIC TROUBLE CODE INDEX

DTC ⁽¹⁾

Description

Perform Test

B1342

ECU Defective

⁽²⁾

B2174

Left Rear Window Remote Up Switch Short To Voltage

B2178

Left Rear Window Remote Down Switch Short To Voltage

B2190

Right Rear Window Remote Up Switch Short To Voltage

B2194

Right Rear Window Remote Down 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 - LS article.

⁽²⁾	Using NGS tester, retrieve and document all continuous Rear Electronic Module (REM) DTCs. Perform REM self-test. If DTC B1342 is retrieved again, replace REM.