'86 FWB - no access to computer codes..

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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, '86 FWB - no access to computer codes.. in Past Cadillac Vehicle Discussion; hey guys. On my '86 FWB, I've tried several times to get to the onboard computer by holding the off ...
  1. #1
    hankk17 is offline Cadillac Owners Fanatic
    Automobile(s): 78 Eldorado x2; 99 Eldorado
    Join Date
    Feb 2004
    Boston area

    '86 FWB - no access to computer codes..

    hey guys. On my '86 FWB, I've tried several times to get to the onboard computer by holding the off button and warmer on the climate control, but it never comes up with the display showing I've gotten into diagnostic mode...

    What gives? Do I have a bad computer, or did they not allow diagnostics on certain model Caddies?

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  3. #2
    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
    Automobile(s): 1968 Cadillac Sedan deVille, 1994 Chevrolet G20
    Join Date
    Aug 2003
    Bucks County, PA

    Re: '86 FWB - no access to computer codes..

    Yours probably uses blink codes. Theres a post in electrical with more info. Basically you have to jump two pins in the connector under the dash, and count the number of times the check engine light flashes

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