Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
Did the radio ad speedometer quit at the same time? remove the radio fuse and see if drain goes away.
the best way to find the cause of a draw is to install an amp meter in line of the positive battery caable and see how much of a drain there is. you would need to wait for a few minutes for modules to go to sleep. then pull fuses one at a time and see which circuit is causing drain. I have seen several radios cause a drain so I would start with that fuse.
There is not a recall on an 03 for this. Some of the newer ones had a recall for a drain.