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Anti-Lock Brake Diagnostic System Check

  1. Turn ignition switch to LOCK position. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. See Figure . Turn ignition switch to RUN position, with engine off. If scan tool powers up, go to next step. If scan tool does not power up, perform TEST F: SCAN TOOL DOES NOT POWER UP  under SYSTEM TESTS.
  2. Turn ignition switch to RUN position, with engine off. Try to establish scan tool communication with Electronic Brake Control Module (EBCM), Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). If communication with all modules is established, go to next step. If communication with all modules is not established, perform TEST E: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  3. Select DISPLAY DTC function for EBCM, IPC and PCM. If scan tool displays any DTCs, go to next step. If scan tool does not display any DTCs, repair Anti-Lock Brake System (ABS) by symptom. See appropriate ANTI-LOCK article in BRAKES.
  4. If scan tool does not display any DTCs that begin with "U", go to next step. If scan tool displays any DTCs that begin with "U", perform TEST E: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE  under SYSTEM TESTS.
  5. If scan tool displays DTC B1000 or B1004, perform DTC B1000: CONTROL MODULE MALFUNCTION  and/or DTC B1004: CONTROL MODULE KEEP ALIVE MEMORY MALFUNCTION  under DIAGNOSTIC TESTS. If scan tool does not display DTC B1000 or B1004, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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