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Instrument Cluster Diagnostic System Check

  1. Ensure ignition switch is in OFF position. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, see TEST B: SCAN TOOL INOPERATIVE  under SYSTEM TESTS.
  2. Turn ignition switch to ON position. Attempt to establish communications with Automatic Transfer Case (ATC), EBCM, PCM, BCM, Instrument Panel Cluster (IPC) and SDM. If communications are established as specified, go to next step. If communications are not established, see TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Use scan tool to display DTCs from specified modules. If DTCs are retrieved, go to next step. If no DTCs are present, repair by symptom. See appropriate ANALOG INSTRUMENT PANELS article.
  4. If scan tool displays DTCs which begin with "U", see TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS. If any other DTCs are displayed, go to next step.
  5. If DTCs B1000, B1397 or B1398 are displayed, repair as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If any other DTCs are retrieved, go to next step.
  6. If DTCs P0562, P0563, P0621, P0622, P1637 or P1638 are retrieved, see appropriate SELF DIAGNOSTICS article in ENGINE PERFORMANCE. If any other DTCs are retrieved, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . Repair as necessary.
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