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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Re: 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.
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Those service windows are lit by tiny halogen lamps. Unfortunately, they can be a bear to get at. You will need to remove the front of the dash to gain access to the lamps. If you decide to do the job, do yourself a favor and replace ALL of the lamps while you have the dash apart.
Ralph, Most common cause of this is the blower fan (proper name for the fan you refer to) continuing to run is a shorted out Electronic Climate Control Module. This solid state device replaces the older style fan speed resistor block (at about 4 times the price) This unit is found on the top of the HVAC box under the hood. (HVAC means heating, ventilation and air conditioning) The HVAC box is found on the passenger side of the firewall. Look behind the A/C's accumulator. It will have an electrical wiring plug on top of it. It will be fastened to the HVAC box with a few 7mm hex head screws. Very easy to change. FYI, do yourself a favor and replace the blower fan motor at the same time. The Electronic Climate Control Module usually fails because the motor is drawing to many amps of current. This is because it's bushings are worn out or the brushes are worn out. This is very common on Cadillacs and Buicks. Charlie PS Not sure why car won't start. Either you drained the battery or blew a fuse which controls starting the engine. Need more info regarding the "no start" condition.
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.