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Self-Diagnostic System

  1. The remote keyless entry system utilizes a self-diagnostic system which may store a Diagnostic Trouble Code (DTC) if a problem exists in the system. DTCs may be retrieved using New Generation Star (NGS) tester and Data Link Connector (DLC) for diagnosis of system.
  2. Connect NGS tester to DLC located below instrument panel. Using NGS tester, perform DATA LINK DIAGNOSTIC TEST. If NGS tester displays CKT 914, CKT 915 or CKT 70=ALL MODULES NO RESP/NOT EQUIP, see appropriate MODULE COMMUNICATIONS NETWORK article to diagnose network concern. If NGS tester displays NO RESP/NOT EQUIP for Generic Electronic Module (GEM), or Central Timer Module (CTM), perform TEST I: NO COMMUNICATION WITH GEM/CTM MODULE  under SYSTEM TESTS. If NGS tester displays NO RESP/NOT EQUIP for Remote Anti-Theft Personality (RAP) Module, perform TEST A: NO COMMUNICATION WITH RAP MODULE  under SYSTEM TESTS.
  3. If NGS tester displays SYSTEM PASSED, retrieve and record continuous DTCs. Erase continuous DTCs. Perform self-test for GEM/CTM and RAP module using NGS tester. If GEM/CTM DTCs are retrieved, see GENERIC ELECTRONIC MODULE (GEM)/CENTRAL TIMER MODULE (CTM) DTC INDEX  table to continue diagnosis. If RAP module DTCs are retrieved, see RAP MODULE DTC INDEX  table to continue diagnosis. If no DTCs are retrieved, perform appropriate test under SYSTEM TESTS .
RAP MODULE DTC INDEX

DTC Description Go To Test
B1309 Power Door Lock Circuit Short To Ground C 
B1341 Power Door Unlock Circuit Short To Ground C 
B1485 Brake Pedal Circuit Short To Voltage D 
B1522 Hood Switch Circuit Short To Ground (1)
B1526 Keyless Entry Keypad Circuit Short To Ground B 
B1562 Door Lock Cylinder Circuit Short To Ground (1)
B1629 Gearshift Indicator Short To Voltage E 
B1845 Ignition Switch Anti-Theft Switch Failure (2)
B2425 Keyless Entry Out Of Synchronization C 
(1) See appropriate ANTI-THEFT SYSTEMS article.
(2) Invalid DTC. Ignore this DTC.
GENERIC ELECTRONIC MODULE (GEM)/CENTRAL TIMER MODULE (CTM) DTC INDEX

DTC(1) Description Perform Test
B1342 GEM Is Defective (2)
B1833 Door Unlock Switch Circuit Short To Ground F 
B1834 Door Unlock Disarm Output Circuit Failure F 
B1836 Door Unlock Disarm Output Circuit Short To Battery F 
(1) Codes listed are only for testing covered in this article. For complete DTC listing, see MODULE COMMUNICATIONS NETWORK - EXPLORER & MOUNTAINEER article.
(2) Clear DTCs. Retrieve DTCs. If DTC B1342 is retrieved, replace GEM and retest system operation.
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