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Ron
Ron, ASE Certified Technician
Category: Cadillac
Satisfied Customers: 33415
Experience:  34 year as an ASE Tech
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I have a 1990 coupe deville with electrical trouble.all the

Customer Question

I have a 1990 coupe deville with electrical trouble.all the instrument lights work except the digital readings on the fuel range and the climate control panel. Checked all the fuses they are all good.and the radio lights up but doesn't work.I would appreciate any advice?
Submitted: 1 year ago.
Category: Cadillac
Expert:  Ron replied 1 year ago.

The problem you are describing with the climate control panel as well as the fuel range panel can be caused by any of the following,

  • Body Control Module (BCM)
  • Climate Control Panel (CCP)
  • Fuel Display Center (Fdc) — Fuel display panel.
  • Ground
  • Power
  • Programmer

    With the Body Control Module being the most common, In order to determine if that is the case you are going t need to do some testing. See the steps in the link below. Copy and paste the link to your browser to open and view the steps.

    https://dl.dropboxusercontent.com/u/104923897/BCM%20test%20Nov%2022.pdf
Customer: replied 1 year ago.
I disconnected fuel data center and ecc did nothing,did the the same in reverse and fdc lit up.what should I look for now?
Expert:  Ron replied 1 year ago.

The common problem is usually with the BCM.

Customer: replied 1 year ago.
What does it mean if one works when the other is disconnected and neither work when both Are connected? Should I just get a bcm?
Expert:  Ron replied 1 year ago.

They are both controlled by the BCM, it usually means the BCM is at fault.

Customer: replied 1 year ago.
I was pushing buttons on radio at the same time and all hell broke loose,things started making noise in dash and both fuel and climate lights flickered and battery drained.am up in arms what could I of done to it by doing that?
Expert:  Ron replied 1 year ago.

With out being there to do some hands on testing I can not say for sure.