TheElementalCashew

I’ve actually got all the lights working except the rear facing lights. I wired them to the cargo light switch, but no luck. Maybe one I get to work on the VPM I’ll work on those lights again. Side note, WAMS is not sure if my 2019 VPM will have the features needed for programming, so I may have to get a 2020 VPM (around $500). They are going to give it a try first, though.

I actually purchased this reprogram, I just haven't pulled the VPM yet to send it in. It is located behind the back seat, on the passenger side. I don't anticipate any weird codes or anything, should be just the cameras and any related features stop working. I guess I'll find out, hopefully nothing too crazy, since this is my DD.

I already asked them, they said they would look into it, but haven’t had much actual engagement from them.

This is the only one I have a the moment. Notice the hourglass in the top left, and the missing parking lines. 360 view is the most messed up, as you can see by the yellow parking lines.

I don’t think 1500s get the power extend. In any case, the mirrors I got extend manually so no switch required.

Yes. I put ‘20 AT4 loaded mirrors on my loaded ‘19 AT4. The only things that didn’t work were the parking/turn signals, reverse/cargo light, and I had to move a wire in the harness to get the task lights working again. Tow mirrors don’t have puddle lights. Your camera angles will also be screwed up, but will work. Dealerships won’t recalibrate.

The buttons look the same, except the large window lock button you have is split in two for me, with the split button on the right being for power folding, and the split button on the left being for window locks.

I've already reached out to WAMS, at least regarding my side of things. He said he is going to look into it.

Things that worked plug and play (I have a 2019, your 2020 may be different): power fold, heat, blind spot, cameras Things that didn't work: rear facing light (no wire for it), turn signal/parking lamp (no wires for it), task lights (wire in wrong spot). Pins 5 and 13 are the task lights and puddle lamps on my 2019. On the 2020 mirrors those pins are parking lamps and task lights (tow mirrors don't have puddle lamps). By swapping those pins in my wiring harness, my task lights work normally, and the parking lamps turn on when my puddle lamps used to (when unlocking the truck in the dark, for example). At some point I'm going to create my own wiring harness (or maybe Boost will come out with one before then), and hopefully gain all the functions of the mirror. The lights really aren't a big deal to me at this point. The only reason I even swapped the pins was because I have the Boost harness that turns the task lights on with my high beams.

It’s a temperature sensor.

This is what they look like in surround view. Notice how the yellow parking lines are not correct, and also my front cameras point a bit low, while the rears point high. That said, if I switch to the front/side view to view the front wheels, I still have a fairly good line of sight. One other potential issue, we both lost our front and rear parking lines. You can see in my picture how there is an hourglass in the top left of the screen. However, they eventually came back for TNAT4, but mine have yet to reappear.

I posted them above. As mentioned before, both of our cameras are misaligned. They still work, but the surround view is rather skewed on the sides. TNAT4 went to his dealer to get reprogramming done, and they were unable to do it without a code from GM. From what I understand, he would have had to buy another set of GM mirrors that come with a code, and there would still be no guarantee that they would be able to reprogram the mirrors I traded him. Maybe he can chime in at some point, but he was looking into having a custom shop fab up a mirror housing that would relocate his cameras to his previously calibrated locations.

2020 GMC Sierra Mirror screenshots are attached, here is a link to the whole electric manual: https://www.gmupfitter.com/files/media/photo/1290/20_Sierra_1500_Electrical_Body_Builder_2019JUN20.pdf I've been told that pin 16, which isn't marked as anything specific, is the rear-facing cargo lamps.

2019 GMC Sierra Mirror screenshots are attached, here is a link to the whole electric manual: https://www.gmupfitter.com/files/media/photo/1162/19_sierra_1500_body_builder_Feb_20_19.pdf

Update: I swapped pins 5 and 13 in my harness and now my tow mirror task lights are functioning normally. As these tow mirrors do not have puddle lights underneath, the integrated parking lights now come on instead of the puddle lamps. TNAT4 and I came to this conclusion based on pin diagrams for our vehicles. He has yet to swap pins on his standard mirrors, but he should regain task light functionality as well. If anyone is interested in the pin diagrams for the 2019 and 2020 GMC trucks, I can post them up. I plan to build and add a 3-wire harness to my truck that will allow the turn signals, parking lamps, and rear cargo lights to function.

Yes, if you get tow mirrors with that feature they will continue to work, plug and play.

Hey, I was curious if you ever finished this install and a write-up. I traded my standard mirrors for some fully loaded tow mirrors, and it would be cool to get the various light features working properly.

I'd love to do a swap, if you are still interested. I have a 2019 AT4 (same color even) with the same mirror features (blind spot, heat, power fold, puddle lights, cameras, task lights). They have black caps.

No spacers. There was a good deal of rubbing, and significant trimming required. The installer said it wasn’t difficult though, and that it may have been less with different tires.

They are +1.

6” BDS and 20x9 Fuel Rebels with 35” Nitto Ridge Grapplers. I need to do some coil overs on the front.

Looks good! Now you just need a Blendmount. [emoji16]

This is probably the one you want, depending on your detector. https://www.gen5diy.com/collections/14-18-silverado-p-p-harnesses/products/2019-chevrolet-silverado-radar-detector-harness I bought the GMC version, but ended up installing using a normal wiretap in my AT4 as it was easier than I thought.