2026 Side Mirror Question

SC4R3C120W · January 26

I recently went from a 2020 RST to a 2026 RST with a lot more premium features. The only thing I can't seem to figure out is my side mirror. It looks as if it has lights, but they do not turn on for anything. I lock/unlock with the fob and nothing, I've put my truck in park and tried turn signals with nothing, i turned on my headlights and nothing. I've set my convenience options for exiting/entering the vehicle and nothing. Is this a mistake from the factory that never got programmed to use?

Just as an FYI, the truck does have the camera package with the 360* for parking and towing (does not have bed camera or rear-view mirror cam). for my first oil change, should i bring this up to the dealer?

Atlas · January 26

I had a 2020 with mirror lights from the factory like that, and the switch was mixed with the rear cargo lamp/ bed lights. Try messing with those.

Of course, there's always the owner's manual... Download here

Atlas · January 26

Here you go, page 145...

newdude · January 26

Also, they will only work in park from factory.

Boost Auto sells mod harnesses to have them work while in drive.

TASK LIGHTS WHILE IN DRIVE - Spot Light In Drive Mirror Mod | 2019-2026 Silverado & Sierra

TASK LIGHTS WITH HIGH BEAMS - High Beam to Spot Mirror Mod | 2019-2026 Silverado & Sierra

Both can be combined.

SC4R3C120W · January 26

thanks everyone for the answers. I was thinking of the older styler tow mirrors where they were always on with headlights or worked as turn signals

2016 Sierra Owner · January 28

The most useless lights on the truck IMO

PhilB · January 28

11 hours ago, 2016 Sierra Owner said:

The most useless lights on the truck IMO

I totally agree with you. I would like to know if anyone uses those lights. They were on my 2019 LTZ, and in 7 years I never used them.

2016 Sierra Owner · January 28

7 hours ago, PhilB said:

I totally agree with you. I would like to know if anyone uses those lights. They were on my 2019 LTZ, and in 7 years I never used them.

Yeah I've had them on my 20 and 24. I think I've turned them on maybe 3 times on both trucks.

cautious optimist · January 28

22 hours ago, 2016 Sierra Owner said:

The most useless lights on the truck IMO

I've used my lights a couple times. They're too dim to be worthwhile facing the front. I've folded my mirrors to get some extra light to the side. I'd love a mod to swap them out for something with power. Something to light up the edges of the road to spot deer with shields to avoid blinding oncoming traffic.

Edited January 28 by cautious optimist

Bikerjon · January 30

On 1/28/2026 at 6:51 AM, PhilB said:

I totally agree with you. I would like to know if anyone uses those lights. They were on my 2019 LTZ, and in 7 years I never used them.

I use them. Very tight squeeze when parking in my garage with wife's car. I installed the Boost Auto TASK LIGHTS ON IN DRIVE MODE. I can see the wall studs better in the dark while parking in my garage.