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Theft Deterrent System 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 PCM, BCM and Instrument Panel Cluster (IPC). 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. Select DISPLAY DTCs function on scan tool for PCM, BCM and IPC. If DTCs are displayed, go to step  5. If DTCs are not displayed, go to next step.
  4. Momentarily rotate ignition switch to CRANK position, do not start engine. Turn ignition switch to ON position. Using scan tool, observe PASSLOCK CODE in BCM. If scan tool displays OPEN, perform procedure for DTC B2958. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display OPEN, repair fault by symptom. See appropriate ANTI-THEFT SYSTEMS article.
  5. 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 recorded, go to next step.
  6. If scan tool displays DTCs P0601, P0602, or P0604, see appropriate SELF-DIAGNOSTIC article in ENGINE PERFORMANCE. If any other DTCs are displayed, go to next step.
  7. If DTC B1000 is displayed, see DTC B1000: BODY CONTROL MODULE INTERNAL FAULT  under DIAGNOSTIC TESTS. If any other DTCs are displayed, go to next step.
  8. If DTCs P0562, P0563, P0621 or P0622 are displayed, see ENGINE ELECTRICAL DIAGNOSTIC SYSTEM CHECK . If any other DTCs are displayed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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