Question about 1989 Cadillac Sedan DeVille

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Fuel Data Center and Electronic Climate Control not funtioning

When I start the vehicle (1991 Cadillac Deville), the Digital Fuel Data Center and the Electronic Climate Control are showing a small 'c' in the display and nothing else. The fuel center doesn't give any fuel information. The Electronic Climate Control can't be operated either. The blower for the Heat/AC is running on high and directed to the defrost on top of the dash.
Every now and then while driving, both start to work for a short time and then stop again.

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  • craig stevns
    craig stevns Jan 13, 2014

    i have changed the bcm the ecc and the fdc and same results still need help

  • Anonymous Mar 16, 2014

    My dash only partially works, and my the top half to my electronic climate control works, but the bottom half doesn't?

  • Anonymous Mar 24, 2014

    I can change modes, and temp. Settings but it will not operate the modes and will not give any heat. A/c works all the time

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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

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Cadillac deville 89 fuel data center and climate control arent working.


Hello Belinda Reid,

Nice car...
(sorry... I'm sure you are not in the mood right now)...

There are CADILLAC Clubs across this country
(lovers, admirers, professionals & amateurs)...

I recommend for future issues you seriously consider
looking into joining... The wealth of information is
really quite EXCELLENT... or buying your own set of
FACTORY WORKSHOP REPAIR MANUALS.

For these issues... (I doubt they are related)
Starting with a GREAT CIRCUIT DIAGRAM
would be the best approach...

I PREFER PROFESSIONAL GRADE FACTORY
repair manuals ... but FREE circuit drawings & your 22 TECHNICAL Service Bulletins (TSBs) can be found
on BBB Industries website
(registration is required... these are real documents)
BBB Industries Premium Alternators Starters Power Steering Products

In the 1989 Deville (an issue shared issue w/Eldorado) ...
I did find a TSB on "BLANK DISPLAY" ... Ironically the
TSB page was also blank (GM humor ..
(I presume)).

The FUEL GAGE seems to be a popular part...
(typically means "unreliable: great point to START").

On eBay (refurbished (1 year warranty)
OEM 1985 1993 CADILLAC DEVILLE FLEETWOOD FUEL DATA CONTROL DISPLAY 1YR...

Rockauto (out of stock (I rest my case))
http://www.rockauto.com/en/catalog/cadillac,1989,deville,4.5l+273cid+v8,1025693,fuel+&+air,fuel+display+control+module,10492

Extra information
More Information for BLUE STREAK ELECTRONICS FDC1

Also see HVAC Controls, Motors & relays
(another OUT of STOCK: popular part)...
http://www.rockauto.com/en/catalog/cadillac,1989,deville,4.5l+273cid+v8,1025693,heat+&+air+conditioning,programmer,19408

Info
More Information for BLUE STREAK ELECTRONICS PRG2

ENTIRE control panels are available on eBay(some good... some NOT-SO-MUCH (but you are protected (sorta)).
85 92 CADILLAC DEVILLE ELECTRONIC CLIMATE HEATER AC CONTROL SWITCH eBay

Dress warm... happy hunting
On the HVAC if the controls seem to be working... another
popular part are in the ACTUATOR DOOR sections of your parts catalogs...

Look through the eBay parts for ideas...
0results for cadillac 1989 deville hvac vac control
AND don't overlook the CONTROL RELAYS that ABOUND in
your vehicle... Buy a few spares BEFORE they become rare.

Hope this helps.

Carnac the Magnificent

Oct 22, 2017 | Cadillac Cars & Trucks

1 Answer

I have changed the ecm in my 1991 cadillac deville and now the climate control and the fuel data system and the radio are blank need help!


The ecm,the last didget can't be under no more than 2 didgets or over 2 didgets if so the ecm is program for different sensors

Sep 14, 2013 | 1991 Cadillac DeVille

1 Answer

1993 cadillac , letter c on fuel data center and climate control


I don't know about the fuel data issue, but the climate control module has failed.

Apr 21, 2009 | 1993 Cadillac DeVille

1 Answer

1986 Cadillac Deville, Fuel Data Center & Electronic climate control panels both reading 'c' and blinking rapidly. the radio blinks rapidly as well, tried fuses, now i'm lost


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.

Mar 30, 2009 | 1986 Cadillac DeVille

2 Answers

Electronic climate control and fuel data center not working


Hi there :
hey have you taken it to autozone and had them do a free diagnostics on the car then can tell u exactly what the problem is i am suspecting a computer issue

Mar 07, 2009 | 1992 Cadillac DeVille

1 Answer

Heater not blowing, No digital readout on the fuel data center and electronic climate control unit on a '92 deville.


check your fuses it might just need a new 20 amp fuse which is a little "U" shaped yellow thing

Jan 15, 2009 | 1993 Cadillac DeVille

1 Answer

Instrument cluster went blank


I am currently working on my 92 Deville with the same problem. I was driving along, and smelled what I felt was a smoking printed circuit board. I looked down, and the digital fuel data center and climate control panel were dark.

I have the factory shop manual, and with the aid of a meter and the manual, I traced the problem to a bad BCM. The 16v supply coming from the BCM was gone. Opened up the BCM and found an overheated transistor. I also removed the fuel data center and the Climate control panel. The fuel data center panel did not smell good. I found a shorted capacitor on the Fuel data center circuit board. I am replacing the capacitor, and will be picking up a used BCM at the boneyard tomorrow. I might also have an overheated wire in a cable that might have to be replaced. I have not gotten that far in the troubleshooting yet.

Good luck with your problem.......

Oct 01, 2008 | 1991 Cadillac DeVille

1 Answer

Electrical Problem with 90' Cadillac Sedan Deville


the climate control is intergrated through the pcm and ecm i would advise you to take the vehicle to the service shop they have a diagnostic scanner that will access the ecm and either clear a code that prevents the climate control from working or find a more severe problem that requires you to replace the hole unit. please rate this solution. thank you and good luck.

Aug 29, 2008 | 1990 Cadillac Deville

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