LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2001 >> LeSabre Custom, 4T65E/MN3 >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control Modules >> Self-Diagnostic System >> Defogger System Diagnostic System Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Defogger System Diagnostic System Check

  1. Connect scan tool to Data Link Connector (DLC). DLC is located on lower 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.
  2. Turn ignition switch to RUN position. Using scan tool, attempt to establish communication with the Instrument Panel Module (IPM) and Rear Integration Module (RIM). If scan tool communicates with modules, go to next step. If scan tool does not communicate with modules, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Using scan tool, select DISPLAY DTCs function for IPM and RIM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair concern by symptom. See appropriate REAR WINDOW & MIRROR DEFOGGERS article.
  4. If scan tool does not display any DTCs beginning with "U", go to next step. If scan tool displays any DTCs beginning with "U", go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  5. If scan tool does not display DTCs B1000, B1004, B1007 or B1009, go to next step. If scan tool displays DTCs B1000, B1004, B1007 or B1009, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  6. If scan tool displays DTC B1327, perform appropriate test. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTC B1327, repair concern by symptom. See appropriate REAR WINDOW & MIRROR DEFOGGERS article.
scientia non olet · About LEMON Manuals