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.
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HOMESERVICE MANUALSBUICK2000CENTURY CUSTOMREPAIR AND DIAGNOSISBODY & FRAMEBODY, CAB CONTROL SYSTEMSBODY CONTROL MODULESSELF-DIAGNOSTIC SYSTEMBODY REAR END DIAGNOSTIC SYSTEM CHECK
2000 Buick Century Custom
Body Rear End Diagnostic System Check
2000 Buick Century CustomSECTION Body Rear End Diagnostic System Check
- Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install 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, engine off. Try to establish scan tool communication with BCM. If communication with BCM is established, go to next step. If communication with BCM is not established, go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE .
- Select display DTC function for BCM. Record all displayed DTCs and status of displayed DTCs. If DTCs are displayed, go to next step. If no DTCs are displayed, attempt to diagnose system by symptom. Go to SYMPTOM TESTS .
- If scan tool displays any DTCs that begin with "U", go to SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE . If scan tool does not display any DTCs that begin with "U", go to next step.
- If scan tool displays DTCs B1000, B1004, B1007 or B1009, go to BODY CONTROL MODULE (BCM) DTC DEFINITIONS . If scan tool does not display DTCs B1000, B1004, B1007 or B1009, go to next step.
- If scan tool displays DTCs B3267 or B3268, go to BODY CONTROL MODULE (BCM) DTC DEFINITIONS table and perform appropriate test. If DTCs B3267 or B3268 are not displayed, go to SYMPTOM TESTS .
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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.