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Question
How do i extract the obd codes from my 1994 cadi sedan deville and erase the light.
Hello,
Getting the light out is not much of a problem, however you are being told something in the emmissions system has a problem, which could affect mileage and in certain instances can cause damage to other components in the system.
Under your steering column and at the bottom part of the dash, you will see a black connector with numerous holes (pins). The code reader will plug in there.
Go to your local parts store and ask for a GM code reader. These things are pretty cheap these days. Inside the package should be a description of what the codes mean. Just an example would be a code for a bad O2 sensor. You would change the sensor, clear the code and the engine should run properly.
The error codes are general symptoms and can mean many things. If you just try to get the light off, this is only a very temporary fix and it will come right back on until you fix what is setting the light off.
In the event that your code reader does not determine the specific problem, you will need to check your local library for a 1994 Cadillac service manual. If not available there, see if you can buy one on Ebay or google "Helm."
Good Luck!
Rob
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Rob Painter
Expertise
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?
Experience
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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