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Audible Warning Diagnostic System Check

  1. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, repair scan tool or DLC connector concern. See TEST E: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in BODY CONTROL MODULES - ASTRO & SAFARI article.
  2. Turn ignition on, with engine off. Using scan tool, attempt to communicate with Body Control Module (BCM) and Instrument Panel Cluster (IPC). If communication with both modules is established, go to next step. If communication with any module is not established, a communication problem exists with class 2 device. Repair communications concern. See TEST D: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - ASTRO & SAFARI article.
  3. Using scan tool, select DISPLAY DTCS function. Retrieve and record any BCM, EBCM, IPC, SDM, PCM or VTD DTCs and their status. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair instrument cluster by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  4. If scan tool does not display any DTCs which begin with a "U", go to next step. If scan tool displays any DTCs which begin with a "U", go to TEST D: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - ASTRO & SAFARI article.
  5. If scan tool displays DTC B1000, B1397, B1398 or B1480, preform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS table in BODY CONTROL MODULES - ASTRO & SAFARI article. If scan tool displays DTC P0562, P0563, P0621, P0622, P1637 or P1638, repair engine electrical concern. See appropriate GENERATOR & REGULATOR article in STARTING & CHARGING SYSTEMS. If scan tool displays any other DTCs, perform appropriate test for DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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