16-pin 5-wire OnStar Rearview Mirror Harness - Chevy Malibu Forum: Chevrolet Malibu Forums
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post #1 of 8 (permalink) Old 05-29-2018, 08:37 PM Thread Starter
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16-pin 5-wire OnStar Rearview Mirror Harness

Hi,

I'm replacing the factory OnStar rearview mirror with a Gentex auto-dimming+compass mirror. Instead of wiring the new mirror into the dashboard, I am trying to wire it to the existing OnStar harness. The 16-pin harness has only 5 pins in use: 8 (black, gound), 11 (blue), 12 (black/white), 14 (grey), 15 (brown/white). The black/white wire controls the OnStar button illumination (green LED light), so I think I could use it as the source of the new mirror.

However, the wire's voltage is strangely 10V. So I got a voltage converter to make it a 12V. The strangest thing is then followed: although the voltage of the wire is 12V according to the multimeter, it can never power on the new mirror. The new mirror is also functional: it works when wired directly to the battery. Hard to understand why it's 10V and why the new mirror fails given a suitable voltage.

Any thoughts on the OnStar harness and other physically nearby wiring options?

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post #2 of 8 (permalink) Old 05-30-2018, 03:55 AM
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Re: 16-pin 5-wire OnStar Rearview Mirror Harness

A voltage that is present without a load can change when a load appears. 10V at "idle", so to speak, may not be 10V when it is being put to use. Boosting 10V to 12V puts a greater load on the 10V source and may overload it, too. Measure the new 12V when the mirror tries to turn on and you may find that it cannot provide the amperage required to do the job.


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post #3 of 8 (permalink) Old 05-30-2018, 07:55 AM Thread Starter
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Re: 16-pin 5-wire OnStar Rearview Mirror Harness

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Originally Posted by DrivenDaily View Post
A voltage that is present without a load can change when a load appears. 10V at "idle", so to speak, may not be 10V when it is being put to use. Boosting 10V to 12V puts a greater load on the 10V source and may overload it, too. Measure the new 12V when the mirror tries to turn on and you may find that it cannot provide the amperage required to do the job.
Thanks for the reminder DrivenDaily. So the OnStar harness cannot be used anyway... Do you think it is possible to use the source from map location?
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post #4 of 8 (permalink) Old 05-30-2018, 10:07 AM
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Re: 16-pin 5-wire OnStar Rearview Mirror Harness

I did a write-up on this. https://www.chevymalibuforum.com/foru...d-compass.html

I'd recommend getting an add-a-circuit and branch off your wipers in the center console and running the power wire up through your A-pillar to pin 13 in the harness. It's ACC/ON power so when the car is shut off, it'll shut off too.

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post #5 of 8 (permalink) Old 05-30-2018, 12:22 PM Thread Starter
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Re: 16-pin 5-wire OnStar Rearview Mirror Harness

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I did a write-up on this.

I'd recommend getting an add-a-circuit and branch off your wipers in the center console and running the power wire up through your A-pillar to pin 13 in the harness. It's ACC/ON power so when the car is shut off, it'll shut off too.
Hey Tommy I was and am reading your post. Nice work! Well, I guess I will do it in a similar way to yours: it is too risky to find the right ignition controlled 12V around map light area without reference. Grabbing my toolbox and will get it done soon!
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post #6 of 8 (permalink) Old 05-30-2018, 02:44 PM
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Re: 16-pin 5-wire OnStar Rearview Mirror Harness

Good luck! You'll love the results! It seems a bit more intimidating than what it really is, but really, it's not that bad at all. And those add a circuits are great because you don't have to ruin your wiring from the factory.

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post #7 of 8 (permalink) Old 05-30-2018, 06:45 PM Thread Starter
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Re: 16-pin 5-wire OnStar Rearview Mirror Harness

Got the new mirror installed successfully. I utilized the ground wire from the onstar harness, and route the power supply to the top edge of the windshield -> inside A-pillar -> the compartment below the dashboard -> the media center (where the factory radio was installed). The power supply is finally connected to the ACC of the media center. All routings are absolutely invisible. Can't be happier with the result!

Special thanks to DrivenDaily and Tommy for the helpful advice and suggestion!
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post #8 of 8 (permalink) Old 05-30-2018, 07:12 PM
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Cool Re: 16-pin 5-wire OnStar Rearview Mirror Harness

Yay!! Congrats! Glad you got it installed and working properly! Wait until you experience the autodimming and you won't have to constantly fiddle with it when you have bright lights behind you. If you look at the next post of my guide, I also installed the autodimming driver's mirror as well and you can do that as well if you so choose with just a bit extra wiring. But of course this is obviously great as it is.

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