Digital instrument panel troubles
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Electrical Technical Information Discussion, Digital instrument panel troubles in Item Specific Cadillac Discussion; I have a '91 El Dorado. on a recent trip my digital speedometer panel went out, now I have no ...
  1. #1
    granerboob is offline Cadillac Owners Member
    Automobile(s): 1991 eldorado
    Join Date
    Oct 2012
    Posts
    1

    Digital instrument panel troubles

    I have a '91 El Dorado. on a recent trip my digital speedometer panel went out, now I have no speed, gas gauge or mileage. At dark with the headlights on the speedo comes on very, very dim. I've checked the fuse panel, all are good. The manual says there is another next to the instrument panel but shows no further location or picture. Any Idea how to get it lit back up of how to find the other fuses?

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  3. #2
    carnut is offline Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
    Join Date
    Feb 2003
    Location
    california
    Age
    66
    Posts
    5,487

    Re: Digital instrument panel troubles

    This car used a module about the size of a pack of cigarettes mounted vertically above the gas pedal on a bracket retained by 2 10mm nuts. Called a central power supply. That module provided the dash illumination. There were at least 2 updates to these because the solder connections would crack over the years. Remove it and let it dangle by the harness plugged into it. Start the car and slap the module with your hand. If the cluster lights up at all, replace it. If I recall the decal on it says CENTRAL POWER SUPPLY. I think it was used from 86 thru about 91. The only other item could be the BCM ( body control module) usually shorted by improper aftermarket stereo installation!

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