richardf Posted August 25, 2008 Report Share Posted August 25, 2008 I have a 1990 Cadiallac Sedan Deville with about 112,000 miles on it. The display center lights quit illuminating and now the heater fan is not blowing. The heater was just fine before the lights went out. What do you think this could be. Thank you. Link to comment Share on other sites More sharing options...
Cadillac Jim Posted August 25, 2008 Report Share Posted August 25, 2008 It sounds like either a fuse, ground connection, connector, or relay, in that order. Running the OBD codes might help; here's how: http://www.caddyinfo.com/readingcodes.html Someone with a 1990 FSM can check the schematic and see what's common between the heater and center display lights, such as power to the heater controls. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
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