Question about 1993 Cadillac DeVille
Check all your fuses first, if they are all good, check for bad ground in dash panel
Posted on Apr 13, 2014
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Posted on Jan 02, 2017
This is defenetly the BCM, I had a 1990 with all of the same problems. Buy a rebuilt and install it behind the clove box. Remember that you must install you memory prom into the new unit as they don't come with any in them (it is what is memorizing your miles driven.) You will get off pretty easy on this one as they are available and not too expensive.
Posted on Jan 29, 2009
If its a digital dash not that this sounds good but smack the dash right in front of the steering wheel a few times and if it clears up or makes it do other things it needs a new instrument cluster.
Posted on Mar 30, 2009
i had the same problem in my 91 deville but the fuel gauge was intermittent at first, working most of the time then eventually it quit working all together, i also replaced my ignition switch thinking that was the issue but what actually happened is the fuel gauge shorted out the 16 volt supply from the bcm (body control module) which also feeds the ac and in my case the digital speedometer. your speedo probably isnt digital, but if you unplug the fuel gauge from the harness your ac gauge should come back on or vise versus unplug your ac and the fuel gauge should come back on right now im trying to locate fuel gauge. i hope this info is helpful to you, all you need to remove the gauge is 1/4 inch drive rachet and 7mm socket and a phillips screwdriver (#1) for the trim
Posted on Aug 04, 2009
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