Question about 1990 Cadillac Deville

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Electrical Problem with 90' Cadillac Sedan Deville

Whenever the car is started the climate control center and the fuel control center both fail to operate. After a 10 sec wait a "d" is displayed on both panels. I have search for solutions to this problem such as checking the diagnostic errors, however the climate controls do not work, which prevents me from accessing these codes. Any help will be greatly appreciated.

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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.

Posted on Aug 29, 2008

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Posted on Jan 02, 2017

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Climate control 1996 cadillac deville


Unfortunately, it sounds like your HVAC control module is failing. You can try a reset by removing the negative battery lead (under the rear seat) for about 10 minutes, and then reconnecting it, but if that doesn't work, you will probably have to replace the module.

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