onboard diagnostics.

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Electrical Technical Information Discussion, onboard diagnostics. in Item Specific Cadillac Discussion; I posted trouble with dash lights going out a few days ago, as I search for an answer I hear ...
  1. #1
    LESPI10153 is offline Cadillac Owners Member
    Join Date
    Aug 2003

    onboard diagnostics.

    I posted trouble with dash lights going out a few days ago, as I search for an answer I hear about onboard diagnostics. What is this and how do I display. I have 1994 Eldorado, does it have this device. I know you can check oil, temp, volts, etc. Not sure how onoard diagnostics works. Do I have to take into dealer to get reading or can my husband find this information. Any help would be appreciated as car is getting worse.

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  3. #2
    vanaisa's Avatar
    vanaisa is offline Cadillac Owners Enthusiast
    Automobile(s): `65 DeVille Convertible´67 Eldorado,´02 DHS
    Join Date
    Apr 2003
    Tallinn, Estonia

    Re: onboard diagnostics.

    Just turn on ignition, press and hold "off" and "warm" buttons for ~3 sec. This enters diagnostic mode (its good to have paper and pen ready). Then computer shows diagnostic codes.
    what those codes mean - by Katshot

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