LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Power Door Lock System & Trunk Release) >> System Tests >> Test A: Automatic Door Locks Inoperative

Test A: Automatic Door Locks Inoperative

WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. If door system diagnostic system check has been performed, go to next step. If door system diagnostic system check has not been performed, perform DOOR SYSTEM DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing door system diagnostic system check, go to next step.
  2. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position, engine off. Using scan tool, read current personalization setting for automatic door lock mode. If scan tool indicates automatic door locks ENABLED, go to next step. If scan tool does not indicate automatic door locks ENABLED, see AUTOMATIC DOOR LOCK/UNLOCK MODES  under PROGRAMMING.
  3. Verify fault is present. If system does not operate correctly, go to next step. If system operates correctly, problem is intermittent. See DIAGNOSING INTERMITTENTS  .
  4. Verify that power door locks operate correctly. If power door locks operate correctly, go to next step. If power door locks do not operate correctly, repair power door lock system by symptom. See SYMPTOM INDEX  table.
  5. Using scan tool, observe DOOR AJAR SWITCHES and DOOR OPEN SWITCH parameters in BCM data list. Close all doors. If scan tool does not indicate CLOSED for both parameters, go to next step. If scan tool indicates CLOSED for both parameters, go to step  8 .
  6. Disconnect appropriate door lock cylinder switch harness connector. It may be necessary to remove door trim panel for access to driver door lock cylinder switch harness connector. See DOOR TRIM PANEL  under REMOVAL & INSTALLATION. Using scan tool, observe appropriate DOOR AJAR SWITCH or DRIVER DOOR OPEN SWITCH parameter in BCM data list. If scan tool does not indicate CLOSED for appropriate parameter, go to next step. If scan tool indicates CLOSED for appropriate parameter, go to step  9 .
  7. Check for short to ground in Dark Blue/White wire between appropriate door lock cylinder switch harness connector and appropriate instrument panel fuse block. See WIRING DIAGRAMS  . Repair as necessary. After repair, go to step  12 . If no problem is found, go to next step.
  8. Check for poor connections at BCM connectors. Repair as necessary. After repair, go to step  12 . If no problem is found, go to step  10 .
  9. Check for poor connections at appropriate door lock cylinder switch harness connector. Repair as necessary. After repair, go to step  12 . If no problem is found, go to step  11 .
  10. Replace and program BCM. See appropriate BODY CONTROL MODULES article. After repair, go to step  12 .
  11. Replace appropriate door lock cylinder switch. See DOOR LOCK CYLINDER  under REMOVAL & INSTALLATION. After repair, go to next step.
  12. Operate system in order to verify repair. If system does not operate correctly, go to step  2 . If system operates correctly, system is okay.
scientia non olet · About LEMON Manuals