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Cadillac Repair/trouble codes

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Expert: - 12/3/2011


Question
how do you clear the trouble code on a 93-94 cadillac sedan-de-ville
4.9 engine  tks,

Answer
Hello,

The first point is that there is a reason for the trouble code in the first place and clearing the code is just a temporary measure and it will appear. these codes do not set arbitrarily for no reason.
1993 and 1994 should be two completely different systems. 1993 is OBDI and 1994 is OBD II. The 1993 could be reset I believe through the heater control, but to be perfectly honest, I haven't had service manuals for the 1993 for at least 12 years, but you can go down to parts stores like Auto Zone and get a cheap code reader and an explanation of what the codes mean and how to reset the computer.
On 1994 I used my OTC scanner to read and reset the codes. You can find these with manuals and software on Ebay these days with the case for $50 plus. The scannner plugs into the OBD II port at the bottom of the driver's side dash via cord.

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Rob Painter

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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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