BCM drawing 95 mA

[tubman]

Hey, I hope someone can narrow down this issue for me. I have a customers 2004 Sunfire that keeps killing the battery. It is drawing 94mA on the cluster circ, which also feeds the BCM. I disconnected the cluster with no difference. I disconnected the BCM and the load dropped big time. So is it the BCM or something that it controls? Is there a common fault with these? I have read where G6's have had a problem similar to this. This model has the RF module for keyless entry.

If I go to my buddies salvage yard, grab a BCM and pop it in will the car start so that I can drive it to the dealership for reprogramming.

Thanks in advance!

By the way I have a 1997 Cavalier that I drive every day with 315,000km and no major issues yet. It has become a mission for me now. I must make it last!

 

[planenut_2000]

It's more likely something that the bcm controls. Pull fuses one at a time while checking draw. You'll want to get to below 25milliamps.

 

[tubman]

I already pulled every fuse one at a time. The only one that made a difference was the Cluster\BCM fuse. I disconnected the cluster with no difference, then I disconnected the BCM, which made a big difference.

 

[MaXXiS]

how long did you wait after each fuse pull because every time you pull a fuse and plug it back in the module wakes back up thats y pulling fusses is such a pain

______________________________

 

[tubman]

I waited everytime for the old Fluke meter to level out. You could see the different current loads as everything rebooted, and then finally leveled out at the same current. I will probably have to swap it to find out. I can try one for free from my buddies salvage yard as soon as I get time to take one out. I already took one out but it was the wrong one. I need one with the RF option for remote locks. For now the customer is driving it. As long as it doesn't sit for days it is ok.

I have read of the BCM killing the batt in some G6's so I guess it is possible. I will let the forum know when it is resolved. Thanks.

 

[tubman]

OK so I finally had a chance to try a different BCM. It made no difference.


So I guess it is back to something that the BCM controls as suggested earlier. All I can tell you is that the guilty circuit is in the middle(BLUE) plug on the BCM. Can anyone hook me up with a wiring diagram for the BCM? Better yet a factory service manual download. Not a DIY manual.
Thanks!