Cruise Control System Diagnostic System Check
WARNING: This page is about a different car, the 2001 Cadillac Seville. However, it is still accessible from the selected car via links, so may be relevant.
- Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, near steering column. See Figure . If scan tool powers up, go to next step. If scan tool does not power up, perform TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS.
- Turn ignition switch to RUN position. Using scan tool, attempt to communicate with Electronic Brake Control Module (EBCM), Instrument Panel Cluster (IPC) and Powertrain Control Module (PCM). If scan tool communicates with EBCM, IPC and PCM, go to next step. If scan tool does not communicate with EBCM, IPC and PCM, perform TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Using scan tool, select DISPLAY DTCs for IPC. If scan tool does not display any DTCs, go to next step. If scan tool displays any DTCs, perform appropriate test in accordance with DTC retrieved. See ANALOG INSTRUMENT PANELS - SEVILLE article.
- Using scan tool, select DISPLAY DTCs for EBCM. If scan tool does not display any DTCs, go to next step. If scan tool displays any DTCs, perform appropriate test in accordance with DTC retrieved. See appropriate ANTI-LOCK article in BRAKES.
- Using scan tool, select DISPLAY DTCs for PCM. If scan tool does not display any DTCs, repair cruise control by symptom. See CRUISE CONTROL SYSTEMS - SEVILLE article. If scan tool displays any DTCs, perform appropriate test in accordance with DTC retrieved. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .