Question about 2006 Chevrolet Impala

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Parasitic battery drain

2005 chev impala, 3.4L
Battery going dead over night, No abnormal activity on the dash. No lights on, or flickering. Removed battery & alternator & had them load tested for shorts at a Starter & Alternator reman. Co. They both test ok.
I replaced the BMC or Ign. module relay & had no problems for one week, then it started again. I disconnected my fully charged battery at
the ground cable, let it sit for 30 minutes at which time i began testing for a power draw with my DMM. My meter is reading a constant 1.36 amps. I started pulling fuses one at a time. The only fuse that made any difference was a 10amp on the drivers side of cabin, labled
"cluster/BCM". From articles I have read, this does not have the symptoms of a bad BCM-module. Your the expert hopfully. I,m just an
Automotive Machinist/Engine Builder/Dino Tester. Any feed-back would be greatly appreciated.........Thanks......Don

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Have u tried diconnecting battery at night then hook it up in the morning? because there isnt a short in the batt. does not mean the batt. is still good it could have a cell that is weak not alowing enough cranking amps to flow.

Posted on Feb 20, 2009

  • RedneckCaddy Mar 03, 2011

    Hi, I have been struggling with this issue for a few weeks and finally found the problem. History: the radio has been acting wonky and the radio power / volume button does not control the radio properly i.e. when you push the power button, the radio comes on but attempting to adjust the volume, changes the fade, balance and bass controls and further turning the volume, shuts the radio off. After a few dead battery mornings and recharges, I noticed that with the charger connected and the radio off, I could hear the unfiltered power sound coming through the speakers. I pulled the radio / amplifier fuse and bingo, no more drain. I am reluctant to get a used radio from the wrecker as I dont know if it was the radio or the amp as the root cause. Hope this helps others. regards, Jim

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What you are describing is called a "Parasitic Drain"

In automotive terms, a parasitic drain is an electrical load that draws current from the battery when the ignition is turned off. Some devices, such as the PCM and the radio memory are intended to draw a very small amount continuously. These draws are measured in milliamps (mA).

An abnormal parasitic drain could be something like a glovebox lamp, lighted sunshade mirror, aftermarket accessory, or luggage compartment light that remains on but undetected. Or an electronic component may malfunction and cause a parasitic drain that is larger than normal specification.

The recommendation for maximum parasitic drain is around 30 mA (0.030 amp). A typical drain today actually falls into the 7-12 mA range, even though some vehicles do approach the maximum.

Unfortunately, many mechanics do not know how to properly test for and/or track down a parasitic drain. You need to find a shop that has a technician that is familiar with this type of problem. The best way is to ask them specificly if they know how to diagnose a parasitic drain. If they hesitate, or act like they don't know what you are talking about, move on to the next shop.

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