99 Deville Battery Drain Issue, possible bad PZM
 

Model: Deville 4dr
Year: 1999

I am having a battery drain issue with my 99 deville. I did a battery drain test and found that it was pulling a current of 2.08amps while the car was off and suppose to be "sleeping". I let the vehicle sit for 15 mins before performing the test to make sure the RAP wasnt still working.

I narrowed the drain to the antenna fuse and comfort fuse located in the trunk. I also found a .200amp drain coming from the inadvert fuse under the hood. I then looked at the inadvert power relay and saw that one wire was completed corroded to the point where it seperated from the relay. I figure that was the issue with the inadvert fuse drain.

My antenna has been broken for a little while now and will not go down. I hear something grinding in the trunk as if its trying to go up or down but nothing happens. I assume thats why the antennna fuse is pulling some current.

My problem is the comfort fuse. The controlled power relay sounds like its working. When i remove the comfort fuse, and reinstal it, i can hear the fuse clicking on and off. The only way I have been able to stop my battery from draining is to keep removing and installing the comfort fuse.

After looking at some threads on here i saw that people were told to search for any codes related to the problem that were coming up. I had a few, but the ones that were interesting were
PZM B1558; PZM B2471

Its looking like i might have a bad Body Control Module PZM, but I wanted to know how I would be able to test it first. Do all signs point to a bad PZM? all the relays behind the back seat are in great shape, no wires seem loose or tampered with.

Thanks

Frank