Question about 1991 Cadillac DeVille

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On a 1991 Cadillac Deville, the digital display on the instrument cluster panel is out. When I turn the key in the ignition, the digital dash lights up briefly and appears to go through a self-check, displays weird/broken characters, then no LED display for the Electronic Climate Control or Fuel readings . The digital display had been flickering for some time but always worked. Now the digital display is completely dark. Dont know if this helps but the rear window defroster works while the blower motor does not. Thank you.

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  • rcot77 Oct 09, 2010

    Thank you Kirkx, I'll follow your advice and hope for the best

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  • Cadillac Master
  • 2,019 Answers

Flickering is not good, and indicates a deteriorating connection of some sort.
The problem is deciding if it is in external power and ground to the dash, or internal to some chip.
Clean all the connections.
Start with the battery terminals, they should be brushed shiny and then greased.
Make sure the engine ground strap and alternator connections are cleaned and greased.
Clean and check the fuses as well, with a test light, because you can't see corrosion enough to reduce current.
It would also be useful to put a voltmeter across the battery and ensure 12.5 volts at idle, and over 14 at high rpm, but not over 14.5 volts.
The next would be the connections to the back of the dash panel, which you reach from underneath. Remember the dash also have one or more ground connections.

If all that does not turn up anything, then I would suggest getting a salvage dash panel.

Posted on Oct 09, 2010

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http://myweb.accessus.net/~090/dtcobd1.html

Hope this is what you need!!!

ABS (Antilock Brake System)
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