markcz

OnStar is standard on all C7 regardless of trim, plus he said this...

...so I'm assuming it will be an easy plug-n-play swap.

Maxpowers

I don't have my car yet but I assume it's as easy as covering the light sensor. Or if you want to lessen sensitivity, use a black sharpie to tint over the sensor.

walleyejack

can the auto dimming door mirror be added the 1lt model ? have always had it on other cars and i really like it.

ersatz928

Yes, if you buy the outside auto-dim mirror glass, and run the two wires from the door mirror to the interior auto-dim mirror.

walleyejack

looks like i would have to change the housing ? and i am sure inside the door somewhere it is wired for it, i would have to change the whole unit by looks of it.

geraldschumann

owc6, yes sir you get Onstar with the non dimming mirror on a 16 A8 1LT Coupe. I prefer a non dimmer as well. When I bought my 67 Mustang at age 16 I thought a switch to dim the brights lights was very cool. Easily amused in the 70's.

walleyejack

hehe, yes i agree, been there, done that. ya i got on star, and could care less about it. but i am wanting to change the door mirror to dimming. my tint on rear glass is enough to not hinder in the rear view mirror.

Mister Big

If you cover the sensor the mirror will stay in the dark, fully-dimmed mode. I think people don't want it to dim at all.

ersatz928

I think the housings are the same, you only have to change the glass, and run the wires thru the door, thru the hinge harness, and up to the inside mirror.

walleyejack

I understand that. The wires are attached to the glass or a sensor in the mirror ? I have looked at gm parts and is not very definitive.

Maxpowers

They way mine works is if the sensor on the dash senses its dark, and the sensor on the mirror senses a light (like headlights), then it dims.

At night, my mirrors don't dim unless some truck has its headlights blasting in.

ersatz928

For an Auto-dim heated mirror, there are a total of 4 wires connected to the glass: 2 for auto-dim, plus 2 for the heater.

There is no "sensor" in the outside mirror. The inside rearview mirror contains the light sensor, and just dims the outside and inside mirror whenever the sensor detects the light from a car behind you.

walleyejack

ok, got it now, so i just need the glass then.

thanks

ersatz928

If you cover the sensor on the mirror (the one that faces the rear window), the mirror will never dim.

ersatz928

And then fish two wires thru the door, up to the inside mirror. Somebody should post a picture of the electrical connector on an autodim inside mirror, to verify that the connector has the 2 wires that need to be connected to the outside mirror. GM may have two part numbers for the inside autodim mirror, one for cars without the outside mirror 1LT (and 2 less pins in the connector on the mirror), and a different pn for cars optioned (2LT or 3LT) which have the outside autodim glass.

I did this retrofit on another car, and VW saved half a cent by deleting these two pins on the inside mirror. I had to crack-open the mirror to add these two wires.

Elite275

Yes, still has OnStar capability.

walleyejack

just talked to my Stealership, informs me i need to buy the whole mirror, housing and whole jam, then have it painted. i can t see that happening. any pics i have viewed shows the glass attaching to the acuator/adjuster and wires run off of it. He tells me the wiring harness is way different. oh well. was worth a try.
thanks for all the input.

Al

owc6

This is the location of the sensor.

walleyejack

Put a piece of black electrical tape over it

owc6

Or buy some Light Dims. I bought a variety pack with differing levels of tint and silver dots. Works perfectly, and they are easy to peel off if some jerk in a lifted truck is blasting his brights.