What job Posted October 18, 2010 Report Share Posted October 18, 2010 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 . Quote Link to comment Share on other sites More sharing options...
What job Posted October 18, 2010 Author Report Share Posted October 18, 2010 Bump, Did I ask the wrong question , or isn't the 91 Deville able to display the ECU codes like the SLS models do? Thanks. Quote Link to comment Share on other sites More sharing options...
Ranger Posted October 19, 2010 Report Share Posted October 19, 2010 Try the OFF and WARMER buttons. Quote Link to comment Share on other sites More sharing options...
What job Posted October 19, 2010 Author Report Share Posted October 19, 2010 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 . Quote Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 19, 2010 Report Share Posted October 19, 2010 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 Quote 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 Link to comment Share on other sites More sharing options...
Ranger Posted October 20, 2010 Report Share Posted October 20, 2010 Not positive, but I think the '91 will display the codes in the fuel data center if memory serves me correctly. Quote Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 20, 2010 Report Share Posted October 20, 2010 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? Quote 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 Link to comment Share on other sites More sharing options...
Ranger Posted October 21, 2010 Report Share Posted October 21, 2010 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. Quote Link to comment Share on other sites More sharing options...
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