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Home >> Cadillac >> 2001 >> Seville SLS >> Repair and Diagnosis >> Electrical >> Charging Systems >> Self-Diagnostic System >> Engine Electrical Diagnostic System Check

Engine Electrical Diagnostic System Check

  1. Perform battery inspection test. See BATTERY TESTING & INSPECTION  under ON-VEHICLE TESTING. Go to next step.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel. Turn ignition switch to RUN position. 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 .
    NOTE: The engine may start during the following step. Turn OFF the engine 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 the ignition switch through all positions while observing the Class 2 Power Mode parameter. Does the ignition switch parameter reading match the ignition switch position for all switch positions? If so, go to next step. If not, see TEST C: POWER MODE MISMATCH .
    NOTE: Lack of communication may be because of a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  4. Turn ON the ignition, with the engine OFF. Attempt to communicate with each of the following modules on the class 2 serial data circuit:
    • Amplifier (AMP)
    • Dash Integration Module (DIM)
    • Drivers Door Module (DIM)
    • Heads Up Display (HUD)
    • Instrument Panel Cluster (IPC)
    • Instrument Panel Module (IPM)
    • Memory Seat Module
    • Navigation Display Head (NDH)
    • Navigation Module (NAV)
    • Navigation Radio (NRC)
    • Onstar (ONS)
    • Radio Module (IRC)
    • Remote Function Actuator (RFA)
    • Rear Integration Module (RIM)
    • Powertrain Control Module (PCM)
    • Supplemental Inflatable Restraint (SIR)
    • Tilt Telescope Module (TTM)
    • Vehicle Theft Deterrent (VTD)
    Does the scan tool communicate with all modules on the class 2 serial data circuit? If so, go to next step. If not, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE .
    NOTE: The symptom list in Symptoms will determine the correct diagnostic procedure to use.
  5. Select the DISPLAY DTCS function for each module. (If using a Tech 2, use the CLASS 2 DTC CHECK feature in order to determine which modules have DTCs set). Record all of the displayed DTCs, the DTC status, and the module which set the DTC. Does the scan tool display any DTCs? If so, go to next step. If not, see SYMPTOMS - ENGINE ELECTRICAL  .
    NOTE: The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will collect all the available information before you perform tests.
  6. Does the scan tool display any DTCs which begin with a "U"? If so, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE . If not, go to next step.
  7. Does the scan tool display DTC B1000, B1004, B1007 or B1009? If so, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If not, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
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