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Trouble codes on a 91 Deville


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Hello all.

Its been awhile since I've visited , mostly because my SLS is about 5 thousand miles away from me at this time .

Anyway, a friend has a 91 Deville that's having problems with the brakes releasing . The cars been sitting for a few years now , but was very well maintained before the PO passed away .

I wanted to help this fellow out , but I'll be darned if I can remember which climate control buttons need to be held to bring up the code display on the dash .

I'm pretty sure that the 91 had a full functioning ECU that had information for all of the cars systems. He's getting ready to take apart the ABS control unit . I asked for him to hold off on taking that ABS apart thinking the computer will have a code if the ABS unit has a problem .

I kind of remember that my Father had a similar problem with his 91 Seville some years back . I think that turned out to be bad calipers .

Any ideas of what this problem might be ? And is anyone willing to share how to bring the codes up?

Thanks in advance for any help .

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Try the OFF and WARMER buttons.

Thanks , but that was the first thing I tried . I know that's what brings up the codes on the 90 Seville ,but it won't work on this 91 Deville for some reason . Did the 91 Deville have duel climate control? (driver and passenger settings) I know my SLS needs to have the passenger heat button held to bring up the codes . Also...I can't recall if the codes are displayed on the dash , or the radio . The radio isn't working in this car , so if the radio is what displays the codes the guy is sol.

Sorry that it's been so long since I've worked on these cars that I can't remember what I once knew like the back of my own hand. Guess I've developed a case of CRS . (can't remember *^#@.)

Thanks for the help .

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It should work for this 4.9 platform, why it does not is odd. Try disconnecting the negative battery cable, to reboot and try again

See this

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

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Not positive, but I think the '91 will display the codes in the fuel data center if memory serves me correctly.

I believe that is correct but wasnt that called the DIC?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Not sure, but I guess since that part of the cluster is digital I guess it could be Mike. I've always been under the impression that that part of the instrument panel was called the fuel data center. I think I got that from my old '92 FSM.

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