Body control module problem - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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Old 02-04-2011, 01:32 PM
lapaynem4 lapaynem4 is offline
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2004 Chevy TrailBlazer LS
Dark Gray Metallic 4.2L I6 4X4
Join Date: Aug 2009
Location: Tn.
Posts: 15
Body control module problem

I have a couple questions to ask, exactly what all does the Body Control Module (truck body controller) do? I have an 04 LS TB 4wd and it has had a parasitic power drain ( .26 amps )for a while now. The reason im asking is, Im thinking of putting a switch on its power source for now until I can get it replaced. If i disconnect the wire from the front fusebox to the rear and pull the 10 amp fuse ( in the front fusebox) to the BCM the drain stops. I could wire a relay in line but im not sure how much amperage the main line to the rear fusebox actually carries. If I did cut power to the BCM overnight would it hurt anything? It has a 3 month old battery in it but I know this drain will eventually ruin it. As long as it doesn't sit for more than a couple days it will start ok. If I looked it up correctly a new BCM was about $100.00 at GM parts direct. Plus I think it has to be flashed (which also worries me) Thanks in advance, sorry for the stupid questions.
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  #2  
Old 02-04-2011, 03:03 PM
lapaynem4 lapaynem4 is offline
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2004 Chevy TrailBlazer LS
Dark Gray Metallic 4.2L I6 4X4
Join Date: Aug 2009
Location: Tn.
Posts: 15
To stop the current draw I have to do both. Pulling 10 amp fuse (#31) in front fuseblock will bring it down to .13 amps or so. Then disconnecting the main power wire to the rear fuseblock will stop it completely. The only fuses in the rear fuseblock that effects the draw is tbc3 and tbc2 (04 and 07). This is why I think the BCM is faulty. It doesn't have Onstar or electronic climate control. Thanks for the reply.
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