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Your Activ should have the mirror as part of its standard configuration. My 2021 LT AWD with the convenience package has the auto dimming mirror. Are you looking to upgrade so that you have the compass and or temp on the mirror? That would be a 3rd party mirror and not necessarily GM.
 

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Your Activ should have the mirror as part of its standard configuration. My 2021 LT AWD with the convenience package has the auto dimming mirror. Are you looking to upgrade so that you have the compass and or temp on the mirror? That would be a 3rd party mirror and not necessarily GM.
RS and Activ can be had without the Technology, Liftgate, and Convenience packages. They're optional for them too.
 

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Wanted to swap my stock rear view mirror out for an auto dimming one. Is that possible? If so, any particular model to purchase? I have a 2022 ACTIV. Thanks!
This would be quite the task. The mirror needs power run to it. ON some of these mirrors you need to install an ambient light sensor on the rear area of the TB, and a way for it to "signal" the mirror to adjust. How they work is the sensor determines headlights of an oncoming car from the back, dims the mirror, then when the sensor no longer feels light from behind it returns to normal. Most have a sensor built into the mirror and of course work, but do not quite sense the lights approaching you as quickly as a rear mounted sensor. You need to run a wiring harness from fuse box, up through the dash, up your a-pillar post (CAREFULLY AS YOU HAVE AIRBAGS IN THERE), across the top of windshield to the mirror.
Here is a link to a video on YOUTUBE to show you the basics on how this is done:
 

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This would be quite the task. The mirror needs power run to it. ON some of these mirrors you need to install an ambient light sensor on the rear area of the TB, and a way for it to "signal" the mirror to adjust. How they work is the sensor determines headlights of an oncoming car from the back, dims the mirror, then when the sensor no longer feels light from behind it returns to normal. Most have a sensor built into the mirror and of course work, but do not quite sense the lights approaching you as quickly as a rear mounted sensor. You need to run a wiring harness from fuse box, up through the dash, up your a-pillar post (CAREFULLY AS YOU HAVE AIRBAGS IN THERE), across the top of windshield to the mirror.
Here is a link to a video on YOUTUBE to show you the basics on how this is done:
the Chevy provided mirror has a sensor on the mirror and works just fine IMO. (Probably helps its a rather short car and has a relatively low ride height). Doubt it would be worth it to go through the effort of getting a mirror with a rear sensor.
 

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the Chevy provided mirror has a sensor on the mirror and works just fine IMO. (Probably helps its a rather short car and has a relatively low ride height). Doubt it would be worth it to go through the effort of getting a mirror with a rear sensor.
Yep. Agree. I wouldn't bother with the rear sensor either. More and more they are a thing of the past and more and more mirrors have "built in" sensors.
 
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