Question about 1989 Cadillac Sedan DeVille

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Fuel Data Center and Electronic Climate Control not funtioning

When I start the vehicle (1991 Cadillac Deville), the Digital Fuel Data Center and the Electronic Climate Control are showing a small 'c' in the display and nothing else. The fuel center doesn't give any fuel information. The Electronic Climate Control can't be operated either. The blower for the Heat/AC is running on high and directed to the defrost on top of the dash.
Every now and then while driving, both start to work for a short time and then stop again.

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  • craig stevns
    craig stevns Jan 13, 2014

    i have changed the bcm the ecc and the fdc and same results still need help

  • Anonymous Mar 16, 2014

    My dash only partially works, and my the top half to my electronic climate control works, but the bottom half doesn't?

  • Anonymous Mar 24, 2014

    I can change modes, and temp. Settings but it will not operate the modes and will not give any heat. A/c works all the time

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  • 3 Answers

This is defenetly the BCM, I had a 1990 with all of the same problems. Buy a rebuilt and install it behind the clove box. Remember that you must install you memory prom into the new unit as they don't come with any in them (it is what is memorizing your miles driven.) You will get off pretty easy on this one as they are available and not too expensive.

Posted on Jan 29, 2009

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I have changed the ecm in my 1991 cadillac deville and now the climate control and the fuel data system and the radio are blank need help!


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Good luck with your problem.......

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