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.
2003 Buick Century BaseFACTORY OEM SERVICE PROCEDURE
Scan Tool Data List
Body Control Module (BCM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. | |||
| Ignition 0 | Inputs | Volts | 0-25 V |
| Ignition 1 | Inputs | Volts | 0-25 V |
| Park (BTSI) Relay | Outputs | ON/OFF | ON |
Powertrain Control Module (PCM) Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. | |||
| Ignition 1 | Eng 1, Eng 2, EGR, Fuel Trim | Volts | 0-25 V |
| TFP Switch | Eng 2, EGR, Fuel Trim | Park/Neutral/Drive 1/Drive 2/Drive 3/Drive 4/Reverse | Park |
Factory Service Tools
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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.