"Audio" circuit parasitic drain on battery.....HELP!
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2004-2007 Cadillac CTS-V Appearance Mods Discussion, "Audio" circuit parasitic drain on battery.....HELP! in Cadillac CTS-V Series Forum - 2004 - 2007; I have been searching for a couple of hours and have found some similar issues to the one I'm having. ...
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    Rez Rider's Avatar
    Rez Rider is offline Cadillac Owners Member
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    "Audio" circuit parasitic drain on battery.....HELP!

    I have been searching for a couple of hours and have found some similar issues to the one I'm having. I have owned my 2005 CTS-V for only a couple months and one day I go to start it up and nothing. Naturally I assume bad battery (or I left a light on) put in on a trickle charger and reinstalled the battery. the next morning it was dead again. hooked up a ammeter in series with the battery and there was a 2.3A draw. I began pulling fuses to locate the issue. I found that in the L.REAR fuse box when I pulled the fuse labeled "Audio" the amp draw dropped to ~1.7, then after about 30 seconds it dropped to normal level (~30mA). Well I left the "audio" fuse out and the next morning the car started up like normal. But now I don't have any power to the radio head unit. I don't have any information on that circuit for troubleshooting. I have read in other posts that the head unit is causing the draw, but I have also read that the amp in the left rear of the trunk is the culprit. I am ok with basic troubleshooting but have no idea how to go about figuring this one out. I am hoping somebody has dealt with this (or at least heard of it). I would appreciate ANY & ALL suggestions from all the experts on here. Thanks in advance!

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    Rez Rider's Avatar
    Rez Rider is offline Cadillac Owners Member
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    Re: "Audio" circuit parasitic drain on battery.....HELP!

    I was really hoping someone would know something about this issue. I guess it's not as common as I thought!

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    69stangscj's Avatar
    69stangscj is offline Cadillac Owners Fanatic
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    Re: "Audio" circuit parasitic drain on battery.....HELP!

    Can you put the Audio fuse back in and disconnect the amp in the trunk and see what happens?

  5. #4
    Rez Rider's Avatar
    Rez Rider is offline Cadillac Owners Member
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    Re: "Audio" circuit parasitic drain on battery.....HELP!

    First of all thanks for your reply. I did try that recently and no luck. I completely removed the amp and the car was still pulling 2.3A when off. Would you happen to know what else is on this circuit? I figure the head unit would be on the circuit, and was thinking of removing it and performing the same test as I did with amp, but I figured i would ask to see if someone would have encountered this problem and knew what the issue was. I am guessing that I will need a new stereo/nav head unit. I tried to find one on GMpartsdirect.com but they only showed the head unit "w/o nav". Can't seem to find a new head unit anywhere. thanks again for your input, I really appreciate it!!

  6. #5
    Rez Rider's Avatar
    Rez Rider is offline Cadillac Owners Member
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    Re: "Audio" circuit parasitic drain on battery.....HELP!

    planning on taking the head unit out tomorrow to see if I still get the same draw from the battery. I honestly just want to find the darn issue so I know WHAT to fix, after that I'll worry about the cost of the new part.

  7. #6
    Rez Rider's Avatar
    Rez Rider is offline Cadillac Owners Member
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    Re: "Audio" circuit parasitic drain on battery.....HELP!

    ok removed the head unit and the amp draw went to acceptable levels. So I think I am in the market for a new head unit, but then when I put the old unit back in (don't want a hole in the dash until I get the new unit) so I begin plugging in the connections and decided to check the draw after each thing I plug in. Each time the amp draw dropped to where it should be. Then I plug everything in and the darn thing went to normal draw from the battery! I am happy that I don't have to buy a new unit, but am a little frustrated because I didn't change anything, which means it could happen again. But I'm happy for now, and hopefully it doesn't return!!!!!!

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