'04 Voy Unexplained Draining Battery While Sitting for 2-3 days - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 08-11-2010, 04:26 PM
ralincv ralincv is offline
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'04 Voy Unexplained Draining Battery While Sitting for 2-3 days

Hi all,
I have an 04 Envoy that is draining the battery over just 3-4 days while the car sits in the garage. I replaced the factory speakers a while back with some JBL's. Don't know if it is just coincidence or whether I may have wired the speakers in reverse (positive and negative leads). I know that these cars are very computer-dependent and that the factory radio is somehow connected to the OnStar system, so I suspect the battery draining problem might be connected with the speaker upgrade I did. I wasn't having this problem prior to the speaker upgrade.

Here are the specifics. The car has a 4.2 liter engine and the non-Bose system. In taking the old speakers out, I discovered that there were external tweeters mounted right next to the main 6" speakers in the front only. The rear speakers did not have the external tweeters. As is customary with factory installed speakers, the speaker leads were not labeled for phase. According to the repair manual I have (cheap Haynes), the color code for the left front is tan & gray; the right front is dark green & light green. The right rear is light blue & dark blue. The left rear is brown & yellow. What the manual doesn't tell me is which colors are the negatives and which are the positives. If I recall correctly, I did not find these same color codes on some of the speakers.

Has anyone out there had this same problem? Any help would be greatly appreciated.
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  #2  
Old 08-11-2010, 04:28 PM
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I didn't fully read your post, but take the Onstar fuse out and see if it stops happening... Onstar is known for sometimes draining the battery over a couple days, on these things, for whatever reason...

Better yet, put an amp meter on the battery, check current draw, then take the onstar fuse out and check amp draw...

If that doesn't work, go fuse by fuse to see what changes the amp draw.

Mike
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Old 08-11-2010, 08:00 PM
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I had the same type of problem about two years ago. If memory serves me correctly, it was either a defective relay or solenoid in the rear life gate. Would drain my battery every couple of days, never left any lights on or anything, just would be dead in just a few days of sitting.
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Old 08-11-2010, 09:08 PM
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GavinVoy GavinVoy is offline
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how old is the battery?
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Old 08-12-2010, 12:06 AM
ralincv ralincv is offline
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Battery is New

Sorry, I overlooked mentioning that the battery is brand new (a Bosch). When the old battery turned up dead, I thought that it was the battery and I replaced it. The battery is probably not the problem, since the odds of two batteries discharging in the same car are not good.

I have began testing each circuit per bartonmd's suggestion, but I have not found any circuit draining the battery by systematically pulling fuses and noting any change in amps at the battery level. In other words, I have not yet found the problem...

Thanks to all who have contributed...I really appreciate it.
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Old 08-12-2010, 08:31 AM
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Quote:
Originally Posted by ralincv View Post
Sorry, I overlooked mentioning that the battery is brand new (a Bosch). When the old battery turned up dead, I thought that it was the battery and I replaced it. The battery is probably not the problem, since the odds of two batteries discharging in the same car are not good.

I have began testing each circuit per bartonmd's suggestion, but I have not found any circuit draining the battery by systematically pulling fuses and noting any change in amps at the battery level. In other words, I have not yet found the problem...

Thanks to all who have contributed...I really appreciate it.
Disconnect the "megafuse" and that'll tell you if it's something in in the fuse block under the back seat drawing the current, then you can start back there... IIRC, both the Onstar and lift gate are back there...

Mike
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  #7  
Old 08-12-2010, 09:56 AM
2007TBlazer 2007TBlazer is offline
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Mine was doing the same thing. Turned out to be a faulty Onstar module that was killing the battery.
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  #8  
Old 08-12-2010, 10:02 AM
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a yazan a yazan is offline
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Oh guys... I have this problem a year ago, but thank you for the suggestions, I will remove the OnStar fuse and try but where can i find it ? underhood or under the back seat ? thanks
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Old 08-13-2010, 12:57 AM
WOOLUF1952 WOOLUF1952 is offline
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The fuse box under the back seat. Listed as #27 in the owners manual.
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  #10  
Old 08-13-2010, 02:13 PM
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a yazan a yazan is offline
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Originally Posted by WOOLUF1952 View Post
The fuse box under the back seat. Listed as #27 in the owners manual.
thank you man
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