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I've seen the procedure and codes listed here before but a search and look through the sticky's did not find them. Anyone have a link or that can post the jumper procedure and the code listing for a 91 C4.
I have them at home but have someone asking for them today.
The two upper right terminals are A and B. Jumper those two and turn the key to on but don't crank the engine. The fan should come one and after 3 cycles of "blink...blink, blink" <----code 12
any stored codes will blink out 3 times each. Example:
Code 33
blink,blink,blink.....(pause) blink,blink,blink
next code and so on.
When all codes finish(from smallest number to biggest)
it will return back to code 12.
Someone may had a link to a site that has all the codes listed and hopefully will post it for you. Posting each code and the associated cause and cure on this site calls for a LOT of typing.
If no one posts a link, it would be a LOT easier for you to pull any stored code(s), then post it here. We can then post what you need to know to address the problem.
Another option is buying a Haynes manual for your year. About $20 at many of the auto parts stores.
For your 95 Ground pins #12 to #4. It will display codes on the speedo. There was a site c4vettes.com that had a very explanation for pulling codes, etc. Can't find it as of late.