Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Body Control Module Diagnostic System Check: Notes
2000 Saturn LS1 AutomaticSECTION Notes
WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use this check as the starting point for any Body Control Module (BCM) complaint. BCM is a very reliable component, and is not likely the cause of malfunction. Most malfunctions are caused by faulty wiring, connectors or components.
- Turn ignition off. Connect scan tool to Data Link Connector (DLC). If scan tool powers up, go to next step. If scan tool does not power up, go to SCAN TOOL DOES NOT POWER UP .
- Turn ignition on. Attempt to establish communication with BCM. If scan tool communicates with BCM, go to next step. If scan tool does not communicate with BCM, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE .
- Check for BCM DTCs. If any BCM DTCs exist, go to next step. If no BCM DTCs exist, check for symptoms and go to appropriate article for symptom related diagnostic procedure.
- Using scan tool, check for any DTCs that begin with "U" (communication DTCs) stored in BCM. If any communication DTCs exists, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE . If no communication DTCs exist in BCM, perform appropriate test under DIAGNOSTIC TESTS . See BODY CONTROL MODULE DIAGNOSTIC TROUBLE CODE DEFINITIONS table.
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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.