Looking to upgrade to tow mirrors

[TerryA2218]

Hello

     I am wondering if someone can help me.  I am wanting to buy a set of tow mirrors for my 2016 gmc seirra.  My gmc mirrors now have just power adjustment.  The mirrors that im looking at have turn signals in the mirror and on the back and the lights that shine down on the ground.  Do I need to pull my inside cover off and see what all pins I have on my mirror plug or is their a harness I can also purchase to plug into the existing harness and plug into the new mirrors?   

[JimCost2014]

harness I can also purchase to plug into the existing harness and plug into the new mirrors?   

 

This^^^^^^^^^^^^

[Scribe325]

I did this when I bought the truck years back. I bought the GM harness for both doors that was compatible with mirrors with lights in them. Everything is plug-and-play but It takes some time and patience to change out the harnesses inside both doors.  No special tools are required beyond some molding tools to remove panels.  You will need to pull off part of the plastic moisture barrier inside the door which is glued in place.  Getting some sealant to replace the stuff you cut is my recommendation.

 

I later bought the power-fold mirror switch which allowed me to go from the “base” mirrors to power fold tow (GM uses the term "camper" for the big towing mirrors).  Here's some part numbers if you're interested in going this route:

 

Mirror control switch: GM part #84643953
Driver side door harness: GM part #23342729

Passenger side door harness: GM part #23342715

Driver side power-folding camper mirror: GM part #84228899
Passenger side power-folding camper mirror: GM part #84228900

 

This mod invalidates the DL8 RPO code and effectively adds DPN RPO code.

 

Also, as is their custom, it's very likely that GM has changed these part numbers multiple times since I did this mod.  Recommend you research accordingly.

 

Edited May 25, 2025 by Scribe325
Added part numbers

[someguy1313]

good timing.  considering the same upgrade.  

[superdave160]

The Harness Dr. sells conversion harnesses for upgrading mirrors.  I went from power adjust/heated mirrors to tow mirrors that were power adjust, heated, turn signal, and reverse lights.  I could have also added power fold but I didn't want that.  I installed the mirrors and installed the harness that I got from the Harness Dr. and everything worked.