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Vehicle Theft Deterrent Diagnostic System Test

NOTE: Vehicle Theft Deterrent (VTD) system may be referred to as Passlock(tm) system.
  1. Connect scan tool to Data Link Connector (DLC) located on left side of instrument panel, near steering column. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in BODY CONTROL MODULES - CAVALIER & SUNFIRE article. For 2002, go to TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in BODY CONTROL MODULES - CAVALIER & SUNFIRE article.
  2. Turn ignition switch to RUN position. Attempt to establish communication with Body Control Module (BCM) and Powertrain Control Module (PCM). If scan tool communicates with BCM and PCM, go to next step. If scan tool does not communicate with BCM and PCM, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - CAVALIER & SUNFIRE article. For 2002, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - CAVALIER & SUNFIRE article.
  3. Select DISPLAY DTCs function for BCM and PCM on scan tool. If any DTCs are retrieved, go to next step. If no DTCs are retrieved, diagnose and repair Vehicle Theft Deterrent (VTD) system by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  4. If any communication DTCs (DTCs beginning with a "U") are retrieved, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - CAVALIER & SUNFIRE article. For 2002, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - CAVALIER & SUNFIRE article. If any DTCs beginning with "B" are retrieved, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If any powertrain DTCs (DTCs beginning with a "P") are retrieved, diagnose and repair powertrain concern. See appropriate testing in SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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