From what I understand the LED lights on the new tow mirrors on the 2015's are capable of illuminating in reverse? If that is true how do you enable that function? Mine do not do that and I can't find anything in the owners manual to that states how they can be enabled. They will light up when the cargo light is on, but not in reverse.
Works great on my 2016 LT. Hardest part was finding a wire that was small enough and strong enough to stick in the connector. Thanks for the picture and description of where to find the BCM!
What type of wire did you finally end up using? I tried with a pair from a Cat 5 cable and it worked, but the next morning when I drove the truck it must have come loose because the lights were no longer turning on when I unlocked the car.
I'll be attempting this on my 2017 today - Wife likes the reverse lights on the mirror's, forgets it's on, and parks truck at sale barn...
4 hours later...
Wife calls on way home, says the Voltage was low, but it's OK now...Gets home, parks truck, forgets it's on... We chit chat, and I go out to check the truck out...it looks like a Search party in the Driveway...Hmmmm, Honey.<we have a blond moment> Yes you do have to turn off the cargo lights when you park it, yes, I do know that is dumb, sure I understand, of course...I'll fix it dear.
Just wanted to update the thread, I was able to successfully use a coaxial cable as a bridge and it has been working for a week no with no issues. Great hack! Now, if there was only a way for change the amount of time the lights stayed when the truck is unlocked!
Tried this on my 2017 and couldn't get it to work. I used a copper wire filed to a point on both ends and checked twice to make sure it was bottomed out on both ends and nothing. Darn, sure would like those leds to come on in reverse and during unlock.
I have an early 2015 model that came with the old style electric / heated towing mirrors, I needed to replace a broken one and installed a set of aftermarket "new style" mirrors with backup lights, I've tried the cargo light switch with no luck does anyone know if there are wiring harness differences if the truck didn't have the backup light mirrors from the factory?
I just completed this successfully on a 2017 Silverado 2500 High Country.
Used the picture from post #4 - the wire colors were different but same locations, I took Coax cable and left ~3/4 inch of insulation and had 3/4" of bare copper wire on each side. Bent the wire 90 degrees and used wire cutters to put a slight point on the end. Pushed into the locations on the pink and brown plugs and worked just fine.
Notes:
1. If you have a backup camera, turning the cargo lights on via the switch, also changes your Infotainment screen to show the backup camera
2. If your headlights are set to auto, and it is night time - when you get out of your car and lock it, the led lights in the mirror stay on until the delay for the headlights to turn off.
3. If you unlock you car via the key fob, the led lights will come on, locking it again turns them back off
4. Putting the car in reverse will illuminate the cargo lamp button - even though your dash info will say cargo lamp is off
5. If you use the cargo lamp button - it gets confusing as to if it is on or off, its best to not trust the button, go by the info messages in the dash
I suspect if you use the diode that some of the "weirdness" listed above goes away, but I do not have a diode to test it with.
I did this modification on my prior truck - 2016 Chevy 2500HD Duramax - and my current 2018 Chevy 3500HD Duramax DRW using pin 26 on the Brown block to pin 25 on the Pink block. Works great on both.
Boostautoparts.com sells a kit to do this, along with YouTube instructions. I ordered it but have not installed yet. Mirror lights operate with b/u lights, and you can still use the cargo light switch to turn them on also.
Hey guys glad you've all been enjoying this mod! Im back with the question has anyone tried it on a 2020 yet? Originally I thought I would not but I do believe I will now.
I'm interested in this mod for a 2020 also. The other night, I was backing my gooseneck trailer in the driveway and it was dark and was having trouble seeing the trailer tires. Turned on the LEDs in the mirror and wow, what a difference it made.
I just sold my Dmax friday and have one of the Boost kits for this that I never installed. PM me if you want it and I'll give a good price
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