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Vehicle » Heating and Air Conditioning » Testing and Inspection » Reading and Clearing Diagnostic Trouble Codes » Displaying & Reading Trouble Codes - HVAC System - Automatic » Without Scan Tool
2000 Buick LeSabre V6-3.8L VIN K
A Tech II or equivalent scan tool must be used to retrieve Diagnostic Trouble Codes (DTCs) from the PCM memory. DTCs can no longer be retrieved at the data link connector. This also eliminates the PCM function of flashing Code 12. Follow the instructions supplied by the scan tool manufacturer in order to access and read either current and/or history DTCs.
Ok, I gave you from the GM field service manual. The reason that the methods you tried didnt work is because they cant be retreived that way. You have to use a scan tool to retreive them. If you are using a cheap code reader, they dont read body or hvac codes. It needs to be a high end scan tool.
Most of the time what you are describing is a faulty control unit itself, but a high end scan tool is needed to test it to verify it
Yes, there are different years, different models and different options on those models that self diagnostic mode was available on.
For your specific year, model and options, there is no self diagnostic mode.
Just a heads up, but trying diagnostic methods or repairs using information from different year, different model, or different options usually winds up in wasting of your time and your money. Sometimes an issue may be universal to any vehicle application, but 99% of the time, the diagnostic methods and repairs are very vehicle specific. Even fault codes have different definitions depending upon year, make, model, engine and transmission configuration