LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Anti-Theft System >> Self-Diagnostic System >> Anti-Theft System Diagnostic System Check

Anti-Theft System Diagnostic System Check

CAUTION: When disconnecting BCM harness connectors, always disconnect Brown connector first, and reconnect last.
  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, see SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  2. Turn ignition on. Using scan tool, attempt to establish communications with Body Control Module (BCM), Powertrain Control Module (PCM), and Instrument Panel Cluster (IPC). If communication is established, go to next step. If communication can not be established, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article.
  3. Using scan tool, select display DTCs function for BCM, PCM and IPC. If DTCs are present, go to step  5 . If DTCs are not present, go to next step.
  4. Momentarily rotate ignition switch to CRANK position. DO NOT start vehicle. Release ignition switch to ON position. With scan tool, observe Passlock(tm) Code in BCM security data list. If scan tool displays OPEN, see DTC B2958: PASSLOCK(tm) SENSOR DATA CIRCUIT HIGH  under DIAGNOSTIC TESTS. If scan tool does not display OPEN, repair by symptom. See SYMPTOM INDEX  table under SYSTEM TESTS.
  5. If scan tool displays DTCs that begin with "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS in appropriate BODY CONTROL MODULES article. If scan tool does not display DTCs that begin with "U", go to next step.
  6. If scan tool does not display DTC P0601, P0602 or P0604, go to next step. If scan tool displays DTC P0601, P0602 or P0604, perform appropriate test. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  7. If scan tool displays DTC B1000, perform appropriate test. See appropriate BODY CONTROL MODULES article. If scan tool does not display DTC B1000, go to next step.
  8. If scan tool displays DTC P0562, P0563, P0621, or P0622, perform appropriate test. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If scan tool displays DTC P0562, P0563, P0621, or P0622, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
scientia non olet · About LEMON Manuals