Displays were working fine then did some electrical work on the wekend. Then Nothing no display at all!! Tok a look at all the fuses I could find and all look ok which one should I look at to make sure??
Dave's right in asking what you were doing previously. Since the problem occurred right after you were doing some kind of "electrical work" on the vehicle, you most likely induced a fault. You'll need to go back over everything you did, item by item and either find the problem visually, or electrically. If that doesn't turn up anything, undo EVERYTHING you did and get back to ground zero when everything worked.
Agreed I did go over everything I did on that day... Several times ( Really just cleraned things up a bit ..
Starting out this is a 84 Deville Limo
Overall car is in Great working order just had no heat and found a bad vac valve that would not mover so replaced that and shes all good on heat. After starting the car The Fan comes on full blast and A/C compressor runs without cycling at all had to remove wires from compressor accumalator iced up within a minute or two!!!
I'm thinking the ECM may have died and would like to check out atleast to see if I have power going in to the ECM! Just nto all that Familar with the setup on this car mainly a Honda person myself...
The only thing I moved on the HVAC system was a wire comming out of the Fan control module that was wire nutted and screwed to the body so I ty wraped it up and installed a new connector. All other eletrical work was minor or not related to any factory systems....
Can I pull codes to determine what maybe going on???
I have noticed several others have similar problems with other models I'm assuming Cadillac used the same system in many other models...
Maybe just some test points I can look at or anything to see where My problem may lie???
Lastly Which is the best shop manual to purchace? Most detailed and useful???
ANY shop manual from any of the major publishers is better than none, but for thoroughness -especially where special-purpose test equipment or tools are concerned, I'd stick with the Helms GM factory manuals. The troubleshooting trees are an excellent source for ideas when looking for multiple faults that may or may not be related to each other. And for electrical fault isolation, the schematics are invaluable.