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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. If problem exists, repair as necessary. If problem does not exist, go to next step.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel. Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, perform appropriate test. See BODY CONTROL MODULES - DEVILLE article in ACCESSORIES & EQUIPMENT.
  3. Using scan tool, attempt communication with each module on class 2 serial data circuit. If communication with each module is established, go to next step. If communication with each module is not established, repair communications concern. See BODY CONTROL MODULES - DEVILLE article in ACCESSORIES & EQUIPMENT.
  4. Using scan tool, select DISPLAY DTC function for each module. Record all displayed DTCs, status of displayed DTCs and module that set the DTC. If any DTCs are displayed, go to next step. If no DTCs are displayed, repair charging system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  5. If scan tool displays DTCs which begin with "U", perform appropriate test. See BODY CONTROL MODULES - DEVILLE article in ACCESSORIES & EQUIPMENT. If scan tool does not display DTCs which begin with "U", go to next step.
  6. If scan tool displays DTCs B1000, B1004, B1007, or B1009, repair these DTCs first. See BODY CONTROL MODULES - DEVILLE article. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, perform appropriate test in accordance with DTCs retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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