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Home › Buick › 2001 › LeSabre Custom, 4T65E/MN3 › Repair and Diagnosis › Accessories & Equipment › Communication Devices › Body Control Modules › Self-Diagnostic System › Brake System Diagnostic System Check

Brake 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 Electronic Brake Control Module (EBCM) and Instrument Panel Cluster (IPC). If scan tool communicates with modules, go to next step. If scan tool does not communicate with all 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 the EBCM and IPC. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair concern by symptom. See appropriate DISC & DRUM article in BRAKES.
  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 B1004 and B1007, go to next step. If scan tool displays DTCs B1004 and B1007, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  6. If scan tool displays DTCs B1513 or B1514, perform appropriate test. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If scan tool does not display DTCs B1513 or B1514, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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