I have a tech2, how do I tell the BCM to stop hyperflashing my LED turn signals?

[sniper_x]

I searched, and maybe I missed a post, but I am trying to start doing things like programming key fobs, etc.
However, first I would like to tell the BCM I have LED taillights.

Is this information available somewhere - Ideally finding a source for all the BCM codes and tunable features would be great?

 

[Doubeleive]

I searched, and maybe I missed a post, but I am trying to start doing things like programming key fobs, etc.
However, first I would like to tell the BCM I have LED taillights.

Is this information available somewhere - Ideally finding a source for all the BCM codes and tunable features would be great?

that is not a feature of the tech2, you need a different 3rd party device that can write it to the bcm or use resistors.

 

[sniper_x]

Ah, good to know.

So, I bought a VCX NANO and have everything installed and running.
It has the ability to run the newer MDI methods of programming as well.

Perhaps that is what people are using to do this?

 

[Doubeleive]

Ah, good to know.

So, I bought a VCX NANO and have everything installed and running.
It has the ability to run the newer MDI methods of programming as well.

Perhaps that is what people are using to do this?

no you need a 3rd party device that will write 3rd party software to the bcm such as a "autosync"

 

[Myfirstz71]

Please correct me if I’m wrong……….. if you change out your standard turn bulbs for LEDS doesn’t that change the load, and result in the quicker flash rate? I remember this issue on my Harley. I needed a load balancer to make it run normal.

 

[Doubeleive]

Please correct me if I’m wrong……….. if you change out your standard turn bulbs for LEDS doesn’t that change the load, and result in the quicker flash rate? I remember this issue on my Harley. I needed a load balancer to make it run normal.

correct, the resulting hyperflash is the automotive industries way of letting you know you have a burned out indicator bulb, a shorted incandescent would change the load a regular led does not re-create that load but there are some brands out there that have a resistor built into the led so you will not have this issue such as genuine Auxito

 

[Joseph Garcia]

You need to install resistors in those circuits, in order to slow down the flash. I left the hyperflash on mine, as I believe that the fast flash attracts more attention from other motorists, and after all, that is the purpose of the directional signals in the first place. I will note that hyperflash is illegal in some states.

 

[sniper_x]

Well, yes i know how to install resistors on the harnesses, but I don't want to do that.
I needed the TECH2 and GDS2/MDI features so I had to buy the VCX Nano in any case, so I was going to disable the bulb out detection feature in the BCM.

I have built many cars, and I hate modding factory harnesses with those taps and other "easy connect" things.
I was about to make a harness with marine grade connectors that allows me to remove the resistors at any time, but I wanted to try the programmatic way in the BCM first.

I need to see if the 2013 Tahoe BCM has that feature like so many other vehicles of this same year, using the same BCM.

 

[swathdiver]

BCM tuning (2007-2014)

GM Body Control Module tuning for the 2007-2014 Gas/Diesel Trucks and SUV’s IMPORTANT NOTE: YOU MUST ALREADY OWN AN AUTOSYNC TO USE THIS TUNING. IF YOU DO NOT ALREADY OWN AN AUTOSYNC, CLICK HERE THE BT DIESELWORKS AUTOSYNC AND BCM TUNING ARE FULLY COMPATIBLE WITH EXISTING EFILIVE ENGINE...

www.btdieselworks.com

 

[sniper_x]

BCM tuning (2007-2014)

GM Body Control Module tuning for the 2007-2014 Gas/Diesel Trucks and SUV’s IMPORTANT NOTE: YOU MUST ALREADY OWN AN AUTOSYNC TO USE THIS TUNING. IF YOU DO NOT ALREADY OWN AN AUTOSYNC, CLICK HERE THE BT DIESELWORKS AUTOSYNC AND BCM TUNING ARE FULLY COMPATIBLE WITH EXISTING EFILIVE ENGINE...

www.btdieselworks.com

So, are you showing me that this function is something that has to be added externally using the AutoSync?
The BCM has no facility for turning off bulb out detection natively?

Other BCM's of this same year do, so I am surprised if this is true.

 

[swathdiver]

So, are you showing me that this function is something that has to be added externally using the AutoSync?
The BCM has no facility for turning off bulb out detection natively?

Other BCM's of this same year do, so I am surprised if this is true.

Yep, they can do it. It cannot be done with GM bi-directional scan tools like the Tech-2 or MDI.

 

[krbjmpr]

Read somewhere here (TYF) that setting incomplete chassis in bcm turns off hyperflash.

Seems to work as a lot of GM van-based (3500, 4500) Class C Motorhomes have the stupid silly LED brake/tail light assembly in rear, incandescent on front, and whatever was handy on the sides.

What is even more interesting is that same chassis & year, same Cab options, etc... when doors are 'double' locked with remote one make/model will flash front signals, side marker, tail lights, clearance lights, etc. Oh, and honk horn too. But near identical floorplan on identical chassis will flash front signals, rear tail, but no other lights at all. I have not been able to find any similarities to identify disparity yet. I suspect one floorplan uses upfitter, other one doesn't.

 

[petethepug]

The BT Dieselworks autosync does not turn off the hyperflash. It’s an option to have it programmed out in their custom BCM tune. It’s an add on to the Autosync module and of course has a bunch of other features in the package.

 

[91RS]

Other BCM's of this same year do, so I am surprised if this is true.

No GM BCMs give this functionality to the end user. Some newer HD trucks can have the hyper flash disabled but the dealer has to call GM and request the special program and reprogram the BCM.