2000 Saturn LS2 AutomaticFACTORY OEM SERVICE PROCEDURE

Body Control Module Diagnostic System Check

  1. Connect all disconnected components. Connect scan tool to DLC. Cycle ignition off, then on. Using scan tool, attempt to communicate with BCM. If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, perform TEST B: NO COMMUNICATION ON CLASS-2 SERIAL DATA LINK  under SYSTEM TESTS.
  2. Using scan tool, select DISPLAY DTC function for BCM. If no current or history DTCs are retrieved, go to next step. If current or history DTCs are retrieved, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  3. Using scan tool, review history BCM DTCs and clear all DTCs. Cycle ignition off, then on. Using scan tool, retrieve BCM DTCs. If no DTCs are retrieved, system is okay at this time. If DTCs are retrieved, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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