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Home >> Buick >> 2001 >> LeSabre Custom, 4T65E/MN3 >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Shift Interlock Systems >> Self-Diagnostic System >> Diagnostic System Check >> Diagnostic Procedure

Diagnostic Procedure

  1. Connect scan tool to DLC. DLC is located on lower left side of instrument panel, near steering column. If scan tool powers up, go to next step. If scan tool does not power up, diagnose scan tool concern. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  2. Turn ignition to RUN position. Attempt to establish communication with the RIM. Does the scan tool communicate with the RIM? If so, go to next step. If not, diagnose body control system. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
    NOTE: If vehicle is a 2001 model year, go to step  4 . If vehicle is a 2002 model year, continue with step  3 .
    3. 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 ignition switch 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, check for power mode mismatch concern. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  4. Select the RIM display DTCs function on the scan tool. Does the scan tool display any DTCs? If so, go to next step. If not, attempt diagnosis by symptom. See SYMPTOM TESTS  .
  5. If "U" series DTCs (communication DTCs) are not retrieved, go to next step. If "U" series DTCs are retrieved, diagnose body control system. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  6. If DTCs B1000, B1004, B1007, B1009 or B1010 are not retrieved, go to next step. If DTCs B1000, B1004, B1007, B1009 or B1010 are retrieved, diagnose as necessary. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  7. If DTC B1328 is retrieved, diagnose charging system. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. If DTC B1328 is not retrieved, attempt diagnosis by symptom. See SYMPTOM TESTS  .
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