Cadillac Repair/ECC Display


My '95 Seville ECC display went dark. The A/C is working along with the  fan. I can't see the temp setting, the outside temp or anything else.
What could it be?


Hi John,

This is a 20 year old vehicle which means it has been exposed to vibration, extreme cold or extreme heat, dust. You have plastic circuit boards that can crack and other variables.
The first thing to do is get your owners manual and locate the multiple fuse panels. Check the fuses.Change if needed.
Chances are good this is a bad unit, but I recommend going to Ebay or Craigs to get a factory service manual for the vehicle. The schematics and flow charts will walk you through the diagnoses where you are not changing parts that do not need to be changed.
The manual will help you through any future problem saving you money.
I think it is the display is bad, but don't go by my guess.
Let me know what you find.

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Rob Painter


Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?


Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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