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.
1989 Cadillac Seville BaseFACTORY OEM SERVICE PROCEDURE
System Test Chart Identification
ECM COMPUTER SYSTEM CHARTS
| Chart | Test Condition |
|---|---|
| SELF-DIAGNOSTIC SYSTEM CHECK | Self-Diagnostic System Check |
| B1 | Odometer Power/Ground Problem |
| B2 | BCM-to-IPC Communication Problem |
| B3 | CCDIC Problem |
| B4 | BCM-to-CPS Power/Ground Problem |
| B5 | Flourescent Display Pwr. Supply Problem |
| B6 | IPCto-CPS Power/Ground Problem |
| B7 | BCM-to-CPS Wake-Up Signal Problem |
| B8 | CPS-to-Other Components Power Loss |
| C1 | CCDIC Symptom Diagnosis |
| C2 | CCDIC Completely Blank |
| C3 & C4 | CCDIC Display Reads "SYSTEM PROBLEM" |
Factory Service Tools
Use the Manual With the Right Hardware
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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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