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Where do you find the programming override button on a 1991 Cadillac DeVille?

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Wiki User
2008-06-13 03:27:57
2008-06-13 03:27:57

Hold the OFF and WARM buttons on the E.C.C. When 7.0. is displayed on the F.D.C press the HI button once, You should now see E.9.5 displayed on the F.D.C. Then hold the ECON and WARM buttons on the E.C.C. and the F.D.C should now display E.5.0 indicating your in override diagnostic mode and depending on what you want to do use the HI or LO buttons the scroll up or down.

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