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Theft Deterrent Diagnostic System Check

WARNING: This page is about a different car, the 2002 GMC Savana, 2002 Chevrolet Chevy Express, 2001 GMC Savana, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. See Figure . Turn ignition switch to RUN position. 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 - CHEVY EXPRESS & SAVANA article.
  2. Using scan tool, attempt to communicate with Powertrain Control Module (PCM) and Passlock(tm) module. If scan tool communicates with PCM and Passlock(tm) module, go to next step. If scan tool does not communicate with PCM or Passlock(tm) module, see TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - CHEVY EXPRESS & SAVANA article.
  3. Select DISPLAY DTCs function on scan tool for PCM and Passlock(tm) module. If scan tool displays any DTCs go to step  5 . If can tool does not display any DTCs, go to next step.
  4. Momentarily rotate ignition switch to CRANK position, but do not start engine. Release ignition switch to RUN position. Using scan tool, observe PASSLOCK CODE in Passlock(tm) module SECURITY DATA LIST. If scan tool displays OPEN, go to DTC B2958: PASSLOCK(tm) SENSOR DATA CIRCUIT HIGH  . If scan tool does not display OPEN, repair by symptom. Go to SYMPTOM INDEX  table under SYSTEM TESTS.
  5. If scan tool displays DTCs which begin with "U", see TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in BODY CONTROL MODULES - CHEVY EXPRESS & SAVANA article. If other DTCs are displayed, go to next step.
  6. If scan tool does not display DTCs P0601, P0602, P0603, P0604, P0605, P0606, P1612 or P1627, go to next step. If scan tool displays DTCs P0601, P0602, P0603, P0604, P0605, P0606, P1612 or P1627, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  7. If scan tool displays DTCs B1007, go to DTC B1007: CHECKSUM VALUE ERROR under DIAGNOSTIC TESTS in BODY CONTROL MODULES - CHEVY EXPRESS & SAVANA article. If scan tool does not display B1007, go to next step. If scan tool displays any other DTCs, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS table in BODY CONTROL MODULES - CHEVY EXPRESS & SAVANA article.
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