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 MANUALSCADILLAC1993SEVILLE BASEREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSANTI-THEFT SYSTEMSYSTEM TESTINGINTERMITTENT OPEN/SHORT CIRCUIT CHECK
1993 Cadillac Seville Base
Intermittent Open/Short Circuit Check
1993 Cadillac Seville BaseSECTION Intermittent Open/Short Circuit Check
- Wiggle suspected PASS-Key system wiring harness. This will set a fault Code ED58 (Eldorado and Seville) or PO58 (Riviera) in PCM if problem is detected in fuel enable circuit. Check for history fault codes in PCM. If a PASS-Key history code is present, check for intermittent wiring or contacts in fuel enable circuit. See appropriate G - TEST W/CODES article in the ENGINE PERFORMANCE Section.
- Check module power and ground circuits while wiggling harness. SECURITY indicator will light and remain on while a problem is detected in key resistance circuits, and will turn off if fault goes away. SECURITY indicator will light for a 5 second bulb check if ground or battery inputs are intermittent. Loss of battery input is not a possibility since internally the decoder module will use ignition input for power if battery is lost.
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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.