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Ok, I have finally resolved this issue. Brake light switch wire from X1-57. The wiring diagram showed it should be run to the lighting schematics. Several searches told me to hook it up to 12v...

So I guess I should start by asking if this circuit is even necessary for other BCM functions if I don’t need to run the starter through it? Engine is running well with Vats removed through HP...

Thanks, that did fill in a couple of blanks in my notes but I'm still confused as to how to hook up BCM X3 pins 15 and 22.
12V or 5V or do I need to add in a resistor?
I guess I just don't know how...

I'm trying to get my BCM to function on a 2014 L83 swap project and wondered if anyone here could help me decipher the ignition switch wiring diagram.
It looks like BCM connector X3 pin 6 is +12v in...

Thanks for the suggestion Jbeemer, unfortunately it didn’t make any difference.

OK, I know that I'm new to this whole tuning thing but I have been getting along good so far with this swap.
I just don't understand why I can't get the throttle to open at low or no MPH.
I have...

Anybody know if this will work on a Gen V L83/6L80 2014 Sierra motor?

Thanks for the responses. First I want to say that the upfitter stuff has been a great help in this swap but the 2014 electrical section is missing the BCM X3 information. I used the 2015 to get...

Has anyone had any success getting the BCM to function properly on a GEN V swap? I'm using a 2014 L83/6L80 from a Sierra and would like to get Backup lights, Cruise Control, Alternator control and...

Anybody got a link to the TSB? Or maybe some aftermarket parts to solve the problem?

I will update it tonight. Thanks.

How are you getting to the "auto shift speed" tables? My version 3.4 only has "Trans type" and "VSS location" buttons under the transmission tab for my 2014 Sierra L83/6L80. Sorry about the hijack.

Thanks, I was looking at the brake torque table last night and thinking that the brake position sensor might be pushing out a little too much voltage. The traction control is a great idea too. So...

Thanks, I have the tune attached now. Maybe there is something goofy in it that's causing this problem. Sorry the log file was so long, I needed to get out of town before I started scanning. I'll...

I swapped an L83/6L80 from a 2014 Sierra into an old Land Cruiser Wagon. Kept the stock program except for Vats is disabled, Starter Diag. is disabled, DOD is disabled and several codes are turned...

I have been doing a lot of research on this since this is where I'm at on my swap. It looks like there are several PWM modules out there that should work. I grabbed a module off of a Volvo at Pick...

Hi, I was searching for info on controlling the cooling fans on the gen V L83 (2014 Sierra) engine but not finding what I need.
Does anyone know if switching the cooling fans to discrete in the...

Thanks, advanced mode got the OS tab to show TCS Patch, VATS Patch 1 and VATS Patch 2.
Do I disable both VATS Patches to disable VATS?
I wish that the description at the bottom of the screen was...

I just noticed that the Trans Diag box is also empty.
Do I need to be connected to the tuner to see these?

I just finished rewiring a 2014 Sierra L83/6l80 for a swap project.
I did a read vehicle/entire and started looking at turning off DOD and VATS etc.
Searching this site tells me that VATS is...