BCM Replacement
Thread Starter
4th Gear
Joined: Jul 2020
Posts: 4
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BCM Replacement
2008 Z51. The battery is draining constantly, to the point where if I don't run it for 2 or 3 days, the battery is dead. This battery is less than a year old. I've taken it in for service to a Corvette specific auto repair place, and they have diagnosed it as a BCM issue. This was during the GM strike, so they were not able to fix it. Now, the place I took it to is taking weeks to look into getting the part...I have found several of them OEM on websites that are reputable. Should I keep waiting for a Corvette place, or is this a pretty straightforward repair that any good service center could repair? It doesn't look like there is anything special about this component, and I'm tired of waiting.
Thread Starter
4th Gear
Joined: Jul 2020
Posts: 4
Likes: 0
The story goes like this. Battery was replaced, still had issues with the battery. This is my wife's fun car, and she was pregnant last year and it didn't get used as much. If we ran it once a month even for a few minutes it would be fine. But eventually once a month turned into once a week, then every few days.
If you turn the car off, open and close the door to kill the accessory mode, there are sounds behind the center console. When I dropped it off I described the sound as if it was trying to load a CD, just lots of clicks and stuff.
The team sat in the car with a multimeter on each fuse until they found one that was drawing current even when off. They say it was drawing from the bmc.
If you turn the car off, open and close the door to kill the accessory mode, there are sounds behind the center console. When I dropped it off I described the sound as if it was trying to load a CD, just lots of clicks and stuff.
The team sat in the car with a multimeter on each fuse until they found one that was drawing current even when off. They say it was drawing from the bmc.
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,629
Would take the car to the dealer, since it may be as simple at just needing a BCM TBS reflash with updated software.
Also, BCM is in the passenger foot well, with the RCDLR above the radio, so it may be the RCDLR that needs the updated firmware flash instead.
Hence BCM is the last item that goes in to sleep mode, and if the RCDLR is the problem, will keep the BCM from going into sleep mode isntead.
Lastly, your location would help, since if you are in the Denver area, can not only put a tech II on the car to figure out the true problem quickly, but have TIS2000 that I can reflash any needed modules with the update firmware if needed for free as well. If you are elsewhere in the country, others like me, have the same that could give you a hand as well. If it does turn out to be the BCM (which I don't think is the problem, but some other module down line isntead), takes me about 30 mins to pull one, pull the board out of it, and resolve the problem on the board instead. Hence with BCM repaired and already married to the car, saves time by not having to marry a new one into the car isntead (tis2000, or TDS flashing).
Also, BCM is in the passenger foot well, with the RCDLR above the radio, so it may be the RCDLR that needs the updated firmware flash instead.
Hence BCM is the last item that goes in to sleep mode, and if the RCDLR is the problem, will keep the BCM from going into sleep mode isntead.
Lastly, your location would help, since if you are in the Denver area, can not only put a tech II on the car to figure out the true problem quickly, but have TIS2000 that I can reflash any needed modules with the update firmware if needed for free as well. If you are elsewhere in the country, others like me, have the same that could give you a hand as well. If it does turn out to be the BCM (which I don't think is the problem, but some other module down line isntead), takes me about 30 mins to pull one, pull the board out of it, and resolve the problem on the board instead. Hence with BCM repaired and already married to the car, saves time by not having to marry a new one into the car isntead (tis2000, or TDS flashing).
