Anti-Lock Brake System Diagnostic System Check
- Turn ignition off. 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 on. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST D: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS.
- Turn ignition on. Try to establish scan tool communication with The Body Control Module (BCM), 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, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Using scan tool, select DISPLAY DTC function for BCM, EBCM, IPC and PCM. Record all displayed DTCs and status of displayed DTCs. If any DTCs are displayed, go to next step. If no DTCs are displayed, repair anti-lock brake system by symptom. See appropriate ANTI-LOCK article in BRAKES.
- 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", go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- If scan tool does not display DTCs B1652, B1656, B1657 or B1658, go to next step. If scan tool displays DTCs B1652, B1656, B1657 or B1658, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
- If scan tool displays DTCs B1982 or B1983, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display DTCs B1982 or B1983, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .