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

Entering Self-Diagnostics

NOTE: The Electronic Climate Control (ECC) panel and Driver Information Center (DIC) make up the Climate Control Driver Information Center (CCDIC). See Fig 1 .

Turn ignition on. Simultaneously push OFF and WARMER buttons on ECC panel. See Fig 1 . Continue to push OFF and WARMER buttons until the segment check appears on the Instrument Panel Cluster (IPC) and CCDIC (approximately 3 seconds). See Fig 1 and Fig 2 .

Fig 1: Climate Control Driver Information Center (CCDIC)
Courtesy of GENERAL MOTORS CORP.

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.