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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. After inspection, 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 - CATERA article.
  3. Turn ignition switch to RUN position. Using scan tool, attempt communication with Body Control Module (BCM), Instrument Panel Module (IPM), Memory Seat Module (MSM), OnStar (ONS), Radio (IRC) and Powertrain Control Module (PCM). If scan tool communicates with all modules, go to next step. If scan tool does not communicate with all modules, repair communications concern. See BODY CONTROL MODULES - CATERA article.
  4. Using scan tool, select DISPLAY DTCs function for each module. Record all displayed DTCs, DTC status, and module which set the DTC. If scan tool displays any DTCs, go to next step. If scan tool does not any display DTCs, repair charging system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  5. If scan tool does not display DTCs which begin with "U", go to next step. If scan tool displays DTCs which begin with "U", repair communications concern. See BODY CONTROL MODULES - CATERA article.
  6. If scan tool displays DTCs 055, B1556 or B1558, perform appropriate test. See BODY CONTROL MODULES - CATERA article. If scan tool does not display DTCs 055, B1556 or B1558, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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