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Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING, then go to next step.
  2. Install scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. Turn ignition switch to RUN position. If scan tool powers up, go to step  4 . If scan tool does not power up, perform TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in BODY CONTROL MODULES - CATERA article in ACCESSORIES & EQUIPMENT.
  3. Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Body Control Module (BCM), Instrument Panel Module (IPM), Memory Seat Module (MSM), OnStar(R), radio and Powertrain Control Module (PCM). If scan tool communicates with BCM, IPM, MSM OnStar(R), radio and PCM, go to next step. If scan tool does not communicate with BCM, IPM, MSM OnStar(R), radio and PCM, perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - CATERA article in ACCESSORIES & EQUIPMENT.
  4. Using scan tool, select DISPLAY DTCs function for BCM, IPM, MSM OnStar(R), radio and PCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair starting system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  5. If scan tool does not display any DTCs which begin with "U", go to next step. If scan tool displays any DTCs which begin with "U", perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - CATERA article in ACCESSORIES & EQUIPMENT.
  6. If scan tool displays DTCs 055, B1556 or B1558, perform appropriate test in accordance with DTC retrieved. See BODY CONTROL MODULES - CATERA article in ACCESSORIES & EQUIPMENT. If scan tool does not display DTCs 055, B1556 or B1558, repair by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
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