Mirror turn signal lights

My truck came with the standard side mirrors without turn signals. I recently installed new mirror assemblies with turn signals and color matched mirror caps. However, the turn signals aren’t working but the mirrors do have power.
I’ve read a couple posts where people said all tundras are prewired for those turn signals. Does anyone have any idea why mine aren’t working? I’ve browsed the wiring diagrams and those are a bit confusing, so not sure where to go from here.
I could tap into the front turn signal wire (if I can find it) and run a wire to the mirrors, but hoping to avoid that.
Any help is appreciated.

 

Would you be able to send over a picture of the wiring on your truck side mirror connector? If you have access to the door jamb connector pictures of that would be a huge help as well

 

@22tundramirrorguy

I also ran into this issue on my 2024 SR5 Sport 4x4 this weekend. I have been trying to find a pinout and a wiring diagram that I can decipher.

The Ultimate Wiring Diagram, Im pretty sure that I found the info on page/section 71, but I don't have the training or decoder ring to figure out WTF is going on there..

I did see one video, where they were installing tow mirrors, on that the particular truck they were working on had a second harness. That harness was located behind the door panel. I'm guessing most of those wires had to do with folding and extending.

Considering that the color matched mirrors come in motorized and manual, for folding and my new mirrors only have one harness, I wouldn't expect the blinkers to be powered by the second harness that I don't have.

So here's a pick of the left side harness. I was hoping to find the wires running to the tail light blinkers on each side of the cab to tap into. Even if they were both on the same side, I could run some extra cable under the floor mats, versus going thru the firewall and taping in near the headlights.

Anyone have any insight into this? I've spent a few hours scouring the web over the last few days. Somehow, no one has completed this. It should be fairly easy. Tap in and add pinned wires to the male mirror Molex or get lucky and repin to a different slot on the Molex. Similar to what the tow mirror guys have done.

Thanks for the help fellas!

 

At lunch today, I called the dealership that I got my truck from and talked to the service manager. He told me that they hadn't done one of these swaps yet and his only advice was to bring it to a reputable stereo shop in the area. Which I'm not opposed to, for liability reasons, but at a likely $120 an hour, I'm gonna save them some time...

His assumption was the same as mine, the wires in the cab are going to the tail lights and i just need to know which ones they are. He said their schematics didn't have color coding to them. Which I find odd, but sure...

I had 15 minutes to tinker with this later, so I pulled the tail lights and took photos of the wiring on each. The left side has 3 wires, all white with different colored stripes.

The right side has 5 wires. 3 are striped and 2 are solid. 2 of the striped ones, on the right side, match the ones on the left side. My suspicion is that those are tail/brake lights. I'm thinking that the remaining striped wire on each side is the blinker.

I'll report back when I find time to mess with it again. If anyone else feels like picking up where I've stopped, have at it.

 

So after the baseball game, that I was watching, I didn't have time to watch an episode of anything before bed. So I decided to tinker a little more.

Looking at the harness, I had five pins, which I expected to be each position for the mirror and the ground. Outside of OEM wiring, in the 12 volt world, black or a black stripe typically means ground, but considering the pink wire was a heavier gauge, than the other 4 wires, I expected it to be the common ground for all mirror functions. Annnd it did ohm out whenever I tested it. However, so did the black wire...

So my results were:
Green moves mirror right
Light blue moves mirror down
Gray moves mirror up

Pink and black ohm out… curious.

Looking inside the mirror's female molex plug, there is a set of pins that are not currently being utilized. I'd expect those to be the ground and positive for the blinker. However, the BSM has to get power from somewhere. Maybe one of them is the positive pin for BSM, the other is positive for the blinker, and my theory on the thicker gauge, pink, wire is correct.

Sadly that doesn't explain the black wire ohming out. I expected it to be "Moves mirror left..." I'll retest some other time.