How to BCM Delete?
Thread Starter
Instructor
Joined: Apr 2012
Posts: 195
Likes: 7
From: Houston Texas
How to BCM Delete?
Long story short...
Full on race car, no interior, or dash Always turn off traction control
Inside got wet and ruined BCM - getting NO COMM message.
I have zero use for the BCM itself, more of an inconvenience, i would rather have an ignition switch and started button anyways, wiring in cabin is a fricken mess, and needs to be cleaned, good time to fix it all.
This i have read about removing BCM...
So if i remove the BCM, what else needs to be done to make the car start?
Thanks in advance
Full on race car, no interior, or dash Always turn off traction control
Inside got wet and ruined BCM - getting NO COMM message.
I have zero use for the BCM itself, more of an inconvenience, i would rather have an ignition switch and started button anyways, wiring in cabin is a fricken mess, and needs to be cleaned, good time to fix it all.
This i have read about removing BCM...
- The VATS system tells the BCM key is there which allows PCM to start car?
- lt.blue wire from brake switch needs removed to keep ABS
- starter relay needs power from a starter switch
- fuel pump relay needs power from a switch
So if i remove the BCM, what else needs to be done to make the car start?
Thanks in advance
Melting Slicks
Joined: Jun 2002
Posts: 2,246
Likes: 66
From: Middletown CT
You might get a better response posting in the Autocross Road Racing Section. You will probably find more people that have done what you are trying to do. The average Corvette owner isn't going to be deleting the BCM.
Just to give you an idea of the work your in for here is a thread showing BCM delete on a C6.
https://www.corvetteforum.com/forums...-race-car.html
Just to give you an idea of the work your in for here is a thread showing BCM delete on a C6.
https://www.corvetteforum.com/forums...-race-car.html
Last edited by Greg_E; Jun 17, 2016 at 06:29 AM.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Various things like the starter, a bunch of lighting, hatch/trunk release etc are routed and controlled via the BCM. You would have to bypass or re-wire every circuit you wanted to work.
The BCM sends a signal to the PCM telling it the car can start. So, you would have to get the PCM reprogrammed to remove the VATS.
I'm pretty sure the PCM controls the fuel pump so that one isn't an issue.
You really need to get the schematics and go through the circuits. I hope you're decent with wiring because it's not a simple task and I'm doubting anyone would walk through every BCM circuit wire by wire with an explanation of what you need to do.
The BCM sends a signal to the PCM telling it the car can start. So, you would have to get the PCM reprogrammed to remove the VATS.
I'm pretty sure the PCM controls the fuel pump so that one isn't an issue.
You really need to get the schematics and go through the circuits. I hope you're decent with wiring because it's not a simple task and I'm doubting anyone would walk through every BCM circuit wire by wire with an explanation of what you need to do.
Thread Starter
Instructor
Joined: Apr 2012
Posts: 195
Likes: 7
From: Houston Texas
Thanks for the replies. I'll try the roadracing section. Looks like a guy did a C6 which i looks way more intrusive.
I can do it all from schematics, but figured i would ask for some guidance before i dive in.
Thanks,
Z
I can do it all from schematics, but figured i would ask for some guidance before i dive in.
Thanks,
Z
Thread Starter
Instructor
Joined: Apr 2012
Posts: 195
Likes: 7
From: Houston Texas
Kind of depends upon what you have done or not done to the ability of the key pellet to be read correctly. The re-learn procedure is done so that the BCM and PCM have a common password for the VATS system based on the resistance of the key pellet used in the procedure. The resistance of the key pellet needs to be read by the sensor inside the key cylinder or a resistor equal in value to the resistance of the pellet put in the circuit to the BCM so that the BCM enables the Theft Deterrent Relay. Without the correct resistance being seen by the BCM the TDR does not get enabled and the engine does not crank.
Alternatively as mentioned in post #3 above the VATS can be programmed out of the PCM.
Alternatively as mentioned in post #3 above the VATS can be programmed out of the PCM.
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