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 DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - PCMSELF-DIAGNOSTIC SYSTEMENTERING SELF-DIAGNOSTICS
1993 Cadillac Seville Base
Entering Self-Diagnostics
1993 Cadillac Seville BaseSECTION Entering Self-Diagnostics
- Turn ignition on. Simultaneously push OFF and WARMER buttons on Climate Control Panel (CCP). Continue pushing OFF and WARMER buttons until segment check appears (about 3 seconds) on Instrument Panel Control (IPC).NOTE: Failure of any segment to glow may result in inaccurate test results. Replace any inoperative segment display before proceeding with self-diagnostic process.
- When segment check appears (all segments glow), system has entered into self-diagnostic mode. Release both buttons. Driver Information Center (DIC) will display diagnostic codes. Diagnostic code level displays PCM codes first, followed by IPC, ACP and SIR codes (if so prompted).
- To proceed to desired level, press and release CCP panel HI (fan up) button for "yes" or LO (fan down) button for "no". Depress LO button to go to next test level (i.e., IPC?, ACP? or SIR?) or depress OFF button to return to next selection in previous test level.
- To exit diagnostics, press AUTO button on IPC. System will go back to normal vehicle operation.
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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.