Computer malfunction
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Computer malfunction in Past Cadillac Vehicle Discussion; My daughter has a 1987 Coupe Deville which was sitting idle for several months. There was a drain on the ...
  1. #1
    badbones50 is offline Cadillac Owners Member
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    Computer malfunction



    My daughter has a 1987 Coupe Deville which was sitting idle for several months. There was a drain on the battery and electical went dead.
    Problem upon restarting car is that digital readings on dash are all jiberish now and unreadable. Is there a sequence for rebooting the computer system so that dashboard information is readable again? This is my best guess as to resolving problem. Any advice appreciated...
    JK.... freezing in Alaska

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  3. #2
    Playdrv4me's Avatar
    Playdrv4me is offline Cadillac Owners 10000+ Posts
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    Re: Computer malfunction

    Disconnect and then reconnect the battery again?

  4. #3
    badbones50 is offline Cadillac Owners Member
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    Re: Computer malfunction

    Quote Originally Posted by Playdrv4me
    Disconnect and then reconnect the battery again?

    Tried that option already with no success...

  5. #4
    Tailfin's Avatar
    Tailfin is offline Cadillac Owners Enthusiast
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    Re: Computer malfunction

    Ummm... I had an 85 and the computer would always reset when I disconnected the negative battery cable. I would say to make sure you leave it disconnected for 20 minutes or so. If you've already done that, your computer might simply be in need of replacement ... I am surprised if that's the case and absolutely nothing else appears wrong with the car. It should be noted that there are other chips and computer-controlled parts that could possibly be a factor (EPROM--stuff like that) that I don't know as much about . Good luck regardless.

    Oh yeah and P.S... Do you know what the electrical drain that you mentioned was? Sometimes, if an aftermarket stereo or something is put in, and not hooked up to the right power source (I had this happen...the ignition can cause problems on these fussy cars), it can cause a power drain which might have screwed things up...

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