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.
1991 Cadillac Seville BaseFACTORY OEM SERVICE PROCEDURE
Multiple Intermittent Codes
History Codes EO47, B333, B334, B335, B336 or B337 This chart should be used if 2 or more dataline history codes are retrieved.
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- Checks open in dataline circuit by measuring resistance of the loop. The first steps ensure BCM RAP has timed out and voltage is not present on the dataline during resistance checks.
- If 10 ohms or more are present, an open in the dataline circuit is indicated. Check the codes set to determine which section of circuit No. 800 to inspect.
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.