DNA Motor Two Mirror Turn signals both flashing

[sully94079]

Help with this problem. My friend and I installed a set of DNA Motor tow mirrors on a 2015 Silverado LTZ. Truck had power folding, heated, and turn signals in the stock mirrors. After these tow mirrors were installed, when he turned on either his left or right blinker both (left and right mirror) began to flash but the rest of the turn signals matched the blinker. Any idea what could have caused this or what is causing this?

[Sierra Dan]

Ask Phil (pgamboa) the site electrical genie 

[pgamboa]

Help with this problem. My friend and I installed a set of DNA Motor tow mirrors on a 2015 Silverado LTZ. Truck had power folding, heated, and turn signals in the stock mirrors. After these tow mirrors were installed, when he turned on either his left or right blinker both (left and right mirror) began to flash but the rest of the turn signals matched the blinker. Any idea what could have caused this or what is causing this?

It’s because these aftermarket mirrors (and a large majority of them) have their turn signal circuits tied to the running lamps circuit. So you’re backfeeding voltage when either turn signal is used and illuminating the running lamps.

I’m guessing these mirrors don’t have a dedicated turn signal indicator on the glass?

This is a common issue.

I’m also going to venture a guess and assume you didn’t change the harnesses? If so, this also means that the backfeeding voltage will be coming from your puddle lamps.


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[sully94079]

Thanks pgamboa for the info on those mirrors. They came with their own harness and the harness was just plug and play. Do you know of a way to fix this? Is this a re-wiring the harness type of fix or will a diode somewhere in line in there work?

[pgamboa]

Thanks pgamboa for the info on those mirrors. They came with their own harness and the harness was just plug and play. Do you know of a way to fix this? Is this a re-wiring the harness type of fix or will a diode somewhere in line in there work?

Yes - they’ll have their own harness but your door harnesses are pinned for DL3 Mirrors. So the pinout is different as shares the same slots in the connector but route for different things on the far end.

Does the mirror has an arrow in the glass or just the Amber forward shining light?


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[sully94079]

His mirros just have the amber facing forward. Nothing on the glass

[pgamboa]

His mirros just have the amber facing forward. Nothing on the glass

Gotcha. Since the mirror has a cargo light, the factory harness won’t be pinned to Support it either.

Two things have to happen here to get this to work right.

Swap harnesses so that the it is pinned correct. Delete the running light circuit for the mirror.


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[sully94079]

Thank you sir for the information. Ill get with him and see what he wants to do!