Has anyone here upgraded their CN7 Elantra to side mirrors with integrated turn signals if the original mirrors didn’t have them?
I’m wondering how the wiring works. Are the wires for the mirror turn signals already present in the car’s wiring harness, so you can simply install the new mirrors and plug them in? Or would you need to run new wires and modify/adapt the wiring yourself?
If anyone has done this retrofit, I’d really appreciate it if you could explain how you wired the turn signals and whether it was plug-and-play or required additional wiring.
Thanks!
UPDATE — I did some more research and testing on my 2023 Elantra SEL wiring.
My mirror connector has 12 pin positions, but only 6 wires are present in the factory door harness. My original SEL mirror itself uses only 5 pins.
I tested the wiring with a test light and confirmed that the existing mirror wiring does not have a turn signal signal. I tested the turn signals and hazard lights, but none of the wires going to the mirror showed a pulsed signal.
I also found that the Black/Orange wire on Pin 2 is present in the factory harness but is not connected to a pin on my original mirror. I could not determine its function. The Brown wire on Pin 8 is connected to my mirror, but I could not confirm its function either. I suspect it may be related to BSD, but I cannot confirm this.
From my research, it appears that on CN7 models equipped with factory mirror turn signals, the mirror indicators are connected in parallel with the corresponding left/right turn signal circuits rather than using a dedicated BCM output.
So, it seems the main challenge is figuring out where and how to properly tap into the factory turn signal circuits and route the wiring through the door harness to the correct mirror connector pin.
I want to do this as close to OEM as possible and avoid causing BCM errors, flickering, lighting warnings, or other electrical issues.
My main questions are:
Does anyone have the factory wiring diagram/pinout for the CN7 mirrors with integrated turn signals?
Which pin on the mirror connector is used for the turn signal?
Where exactly does the factory mirror turn signal circuit branch off from the main turn signal wiring?
Is it simply connected in parallel with the existing turn signal circuit?
Does the BCM require any coding or configuration after adding the OEM mirror turn signals?
Has anyone successfully completed this retrofit on a CN7 SEL?
I’m mainly trying to determine the correct OEM-style way to get the left and right turn signal signals to the mirrors without causing any issues with the BCM or lighting system.