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Home >> Buick >> 2001 >> Park Avenue Base >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control Modules >> Self-Diagnostic System >> Engine Electrical Diagnostic System Check

Engine Electrical Diagnostic System Check

  1. Check battery. Ensure battery is fully charged. Go to next step.
  2. 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.
    3. NOTE: The engine may start during the following step. Turn engine off as soon as you have observed the crank power mode.
  3. Access the Class 2 Power Mode in the diagnostic circuit check on the scan tool. Rotate ignition switch through all positions while observing ignition switch power mode parameter. If ignition switch parameter readings match ignition switch position for all switch positions, go to next step. If ignition switch parameter readings do not match ignition switch position for all switch positions, repair voltage input to body control module as necessary. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
  4. Turn ignition on. Try to establish scan tool communication with Body Control Module (BCM), Climate Control Panel (CCP), Instrument Panel Cluster (IPC), Memory Seat Module (MSM), Onstar(R) (ONS) 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.
  5. Using scan tool, select DISPLAY DTC function for BCM, CCP, IPC, MSM, ONS 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, diagnose system by symptom. See appropriate article in STARTING & CHARGING SYSTEMS.
  6. 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.
  7. If scan tool displays DTCs B1000, B1652, B1656 or B1658, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If scan tool does not display DTCs B1000, B1652, B1656 or B1658, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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