Power Folding Mirror Upgrade

November 13, 2016

Ok,so after some more research on my side,dealer ordered/ installed non powerforld mirrors & told me they aren't made- hah,yeah right,so that's the issue on my truck,parts guy doesn't know or care.Thanks for everyone's help

No Tyme · November 13, 2016

These young guys that work at dealerships, or even parts stores today only know what the computer tells them. There is always someone around the proverbial corner who knows of a better way.

block8head · November 13, 2016

Anyone here looking for DL3 powerfold mirrors and harnesses? I have a set forsale in the Forsale sections.

AdamZ71 · November 21, 2016

Hey everyone just an update on my build , was not able to convince my sales gal to let me pop any door panels so I wasn't able to confirm the unicorn harness exists . I have managed to find a cheap used set of DL8 harnesses that I am having shipped this week - 50$ CDN for the pair - still hard to find these items cheap - at least here in Canada

Mirror switch which was USA only stock has yet to arrive either.

My plan is to use the pass. harness as the donor and build the driver one on my bench so its plug and play when i get the door panel off and only have to pull and wire the passenger one - after some good advise I'm also going to pin it for the auto dim so down the road when I swap my rear view i can wire that feature as well.

Getting colder by the day here so its looking more and more likely i wont be doing the swap until spring - or if i have a decent day where i can run the heater in the garage for a few hours to heat er' up enough to be comfortable pulling door panels again!

rick08 · December 28, 2016

Hey All, just completed the DL8 to DL3 mirror swap on my '15 GMC Sierra SLE. The magical door harness from the All Terrain exists. I bought a set of dl3 mirrors and door harness from a guy with a '16 GMC All Terrain without memory seats. The mirrors AND harnesses were plug and play, No flashing required. No splicing of any wires. No running new wires. I also bought the powerfold switch to complete the mod.

mirror part #'s 23180074 and 23499472

harness part #'s 23342729 and 23342715

powerfold switch # 23154702

This worked on my truck (dec/14 build), can't say it will work on everyone elses.

Hope this helps.

pgamboa · December 28, 2016

Hey All, just completed the DL8 to DL3 mirror swap on my '15 GMC Sierra SLE. The magical door harness from the All Terrain exists. I bought a set of dl3 mirrors and door harness from a guy with a '16 GMC All Terrain without memory seats. The mirrors AND harnesses were plug and play, No flashing required. No splicing of any wires. No running new wires. I also bought the powerfold switch to complete the mod.

mirror part #'s 23180074 and 23499472

harness part #'s 23342729 and 23342715

powerfold switch # 23154702

This worked on my truck (dec/14 build), can't say it will work on everyone elses.

Hope this helps.

This is good news! What are the chances I could convince you to re-open the panels and get pinout assignments of the different connectors? I would be curious to know how they are wired up. And is an "All Terrain" model an SLE or lower trim? Thanks for the update!

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rpsixeight68 · December 28, 2016

Hey All, just completed the DL8 to DL3 mirror swap on my '15 GMC Sierra SLE. The magical door harness from the All Terrain exists. I bought a set of dl3 mirrors and door harness from a guy with a '16 GMC All Terrain without memory seats. The mirrors AND harnesses were plug and play, No flashing required. No splicing of any wires. No running new wires. I also bought the powerfold switch to complete the mod.

mirror part #'s 23180074 and 23499472

harness part #'s 23342729 and 23342715

powerfold switch # 23154702

This worked on my truck (dec/14 build), can't say it will work on everyone elses.

Hope this helps.

So, just to be clear.... swapping to a set of DL3's, replacing the mirror switch w/ part #23154702 and replacing the driver and passenger side harnesses with 23342729 & 23342715 got you full functioning DL3's? Power adjust, heat, power fold, turn signals & puddle lights? No additional wires or grounds? Just want to confirm as I have already installed the DL3's and the switch for power adjust, fold and heat and have a line on both harnesses noted.

rick08 · December 28, 2016

rpsixeight68 That is correct, no additional wiring at all. Though i should have mentioned that of course the auto dim and curb tilt features do not work. I haven't tried the fold with the remote yet either, i'm guessing it wont work. The only other thing not checked is the heat, feeling like it will work seeing as the other main features work.

pgamboa I had to have my friend, who is a Tech do the work as the weather here in Canada is not favourable. So, at this time I will not be taking it apart. Maybe when the warmer weather comes back.. Sorry!

pgamboa · December 28, 2016

rpsixeight68 That is correct, no additional wiring at all. Though i should have mentioned that of course the auto dim and curb tilt features do not work. I haven't tried the fold with the remote yet either, i'm guessing it wont work. The only other thing not checked is the heat, feeling like it will work seeing as the other main features work.

pgamboa I had to have my friend, who is a Tech do the work as the weather here in Canada is not favourable. So, at this time I will not be taking it apart. Maybe when the warmer weather comes back.. Sorry!

No worries at all! Completely understand. Auto Dim wouldn't work because it is dependent on having an Auto Dim Rear View Mirror. When the Rear View Mirror engages, it sends the signal to the Driver Side Mirror to dim.

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rick08 · December 29, 2016

Has anyone been successful at getting the "flash" done to enable curb tilt etc on the dl8 to dl3 mirror swap?

pgamboa · December 29, 2016

Has anyone been successful at getting the "flash" done to enable curb tilt etc on the dl8 to dl3 mirror swap?

I tried. I have a good relationship with my Service Advisor and after showing him my binder of work, photos, and all, he said "Sure, we can flash the LTZ Profile on your BCM. 30 Minutes and $60." I was tickled to death. An hour later, he came out with bad news that his tech said "You should know better. Unless you have the cab chassis truck, we don't have the calibration codes to perform this work on any other truck models". They called Tech Assist and was told my truck is not listed as a qualified truck to get the programming.

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AdamZ71 · December 29, 2016

Rick98 that's awesome to hear that the unicorn harness does in fact exist and work. I will certainly be hunting for these now as I too have not ventured to do this myself yet because of our awesome Manitoba winter we've been having even to heat up my garage isn't the best option.

thanks for sharing your success!

pgamboa · December 29, 2016

Rick98 that's awesome to hear that the unicorn harness does in fact exist and work. I will certainly be hunting for these now as I too have not ventured to do this myself yet because of our awesome Manitoba winter we've been having even to heat up my garage isn't the best option.

thanks for sharing your success!

If you end up getting these, please PM me so I can understand the pinout for compatibility before you install it. I am going to try and source a set myself, but I'm up to my eyeballs in harnesses. LOL.

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No Tyme · December 31, 2016

Bummer, I received one of my 2 harness's I ordered. Now I have to wait till Tuesday for the other to do the project.

I broke down and ordered the harness's since I loose my left turn signal periodically. I give up trying to work under the dash...

pgamboa · January 3, 2017

Hey All, just completed the DL8 to DL3 mirror swap on my '15 GMC Sierra SLE. The magical door harness from the All Terrain exists. I bought a set of dl3 mirrors and door harness from a guy with a '16 GMC All Terrain without memory seats. The mirrors AND harnesses were plug and play, No flashing required. No splicing of any wires. No running new wires. I also bought the powerfold switch to complete the mod.

mirror part #'s 23180074 and 23499472

harness part #'s 23342729 and 23342715

powerfold switch # 23154702

This worked on my truck (dec/14 build), can't say it will work on everyone elses.

Hope this helps.

With the help of No Tyme providing me with the pinout for the passenger side, this harness appears to be designed for towing mirrors and not DL3s.

It is pinned such that Seat Memory has been removed.

Rick08 - The reason this appears to be working is because:

- Turn Signal Circuit is pinned correctly.

- Your Puddle Lamps are functioning as Park Lamps and not as true Puddle Lamps.

- Seat Memory / Serial Data Bus # 8 is removed

This passenger harness is pinned for Turn Signal, Heated, Power Fold, Courtesy Lamp (Cargo Lamp), Park Lamps. Both ground circuits are present as well.

We should have more info on the Driver's Side harness in the next day or so.

Unfortunately, this is not the "unicorn" we've been looking for.

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