Divamom5150 Posted October 22, 2012 Report Share Posted October 22, 2012 my battery is drained of all power overnight I have purchased a new battery and the problem was resolved for a while now I having the same problem again. I even replaced the battery and the new battery was dead in the morning. Please help. Link to comment Share on other sites More sharing options...
KHE Posted October 23, 2012 Report Share Posted October 23, 2012 Do you have a trunk mounted CD changer? Sometimes, the door can be partially ajar on the changer and it attempts to eject the CD cartridge but cannot. This will drain the battery. To verify the circuit that is causing the problem, disconnect the negative battery cable and connect a ammeter between the cable and the battery. With the trunk open, wait until the PZM "goes to sleep" which is about 20 minutes. Note the reading on the ammeter. If it is high (>30 mA), begin pulling fuses in the trunk fuse panel until you come see the ammeter go below 30 mA. That will be the curcuit that is draining the battery. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 23, 2012 Report Share Posted October 23, 2012 By all means follow KHE's advice but, check trunk and glove box lights, I recently solved an overnight dead battery problem and it was the trunk light Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
hjb981 Posted October 24, 2012 Report Share Posted October 24, 2012 I also have a '97 DeVille, and trunk lights, glove-box lights etc. should not be able to drain the battery, since the car is supposed to shut off all power after 10 minutes of inactivity (even if you leave a light on, it turns off). So, if an interior light or something similar is draining the battery, there must also be a problem with the power shut-off. Maybe something triggers the system on -- opening the door, using the FOB (the remote unlocking thing) to unlock the door, popping the trunk are all things that normally triggers the system on again (for another 10-minute interval), and if one of those switches malfunctions, maybe that could cause the system not to turn off. Maybe there are exceptions to this shut-down system, but I am not aware of any except for the radio receiver that responds to the buttons on the FOB transmitter (and likely also the hazard flashers would stay on if activated). I am not sure about the trunk CD-changer, but when the 10-minute timer shuts things off, at least it includes the head unit (radio and cassette deck). If you cannot find any obvious reason why the battery is draining, you could measure the current flowing from the battery and start pulling fuses. Then you should be able to track down where the problem is. To do this, first wait for the 10-minute timer to shut off power. It will shut off even if the doors, trunk and hood is open, so leave everything open to be able to access the fuses. As long as you do not close or open anything (and not turn the ignition on) the power should remain off. If you are going to connect an ammeter in series with the battery for this measurement, you would probably need to do that first, and then wait 10 minutes. You can check if the timer has shut off by using the radio, as it will shut down when power is lost. Make sure to not turn on anything that drains more current that the ammeter is rated for if you use one. Btw there is another hidden light under the hood. PS: my answer partly overlaps with KHE:s, as I did not notice that I was mentioning some things already mentioned. I must have read KHE's post a bit to quickly the first time. Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 24, 2012 Report Share Posted October 24, 2012 Good point about the retained power feature, are you sure it controls the trunk light also?, I dont know that for sure The under hood light is a good thought, Pulling the fuses to see which one sparks will isolate the circuit that is on Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
rockfangd Posted October 25, 2012 Report Share Posted October 25, 2012 well the underhood light is controlled by the headlight switch only. So i wouldnt think this could be cause GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
hjb981 Posted October 25, 2012 Report Share Posted October 25, 2012 The headlight switch is also controlled by the retained power feature. I have seen the parking lights (activated by pulling the headlamp switch out half-ways) turn off after about 10 min when I purposefully left them on once. Unlocking the car (which reactivates retained power) turned them back on. If I work around the car at night with the trunk open, the trunk light eventually shuts itself off, and it can be reactivated again by pressing the unlock button on the FOB, so I would think that it is also controlled by the retained power feature. Link to comment Share on other sites More sharing options...
rockfangd Posted October 26, 2012 Report Share Posted October 26, 2012 that is correct. it is pretty well fault proof. the only thing is if it wont go to sleep then you will have issues GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
the gold2 Posted October 26, 2012 Report Share Posted October 26, 2012 Is it possible that there may be coolant leak or external rain that gets onto the alternator only to drain the battery? I have read that scenario on other car manuf. Link to comment Share on other sites More sharing options...
hjb981 Posted October 26, 2012 Report Share Posted October 26, 2012 @Divamom5150: Do you find any of the suggestions presented here helpful? There is some information about how the system is supposed to function, and there are some suggestions on how to troubleshoot. If anything is unclear, you can always post a reply and ask for clarification. Link to comment Share on other sites More sharing options...
the gold2 Posted November 1, 2012 Report Share Posted November 1, 2012 One other possibility. Looking at my '92 Eldo service records, I saw that the driver's door latch had a loose harness and that caused the RAP to stay on and drain the battery repeatedly. Took them awhile to figure it out... Link to comment Share on other sites More sharing options...
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