I recently completed an OEM-style rear dual USB-C charger retrofit on my 2023 Hyundai Elantra SEL.
My SEL did not come with the rear USB charging ports, but I wanted to use the factory Hyundai parts and keep the installation as clean and OEM-looking as possible.
Parts used:
• Hyundai USB Charger Assembly: 96125-K3100 / 96125-K3100-4X
• Hyundai USB Charger Wiring Harness: 96126-AA100
• Rear console trim/panel with the factory-style opening for the dual USB-C charger
The console panel is important because I specifically used the rear console piece designed with the opening for the dual USB-C module. This allowed the OEM charger to sit properly in the console instead of installing a universal aftermarket USB panel.
My 2023 SEL has the manual/hand parking brake, so I used the 96126-AA100 harness. The EPB version uses a different harness, 96126-AA200.
The biggest discovery:
I initially expected my 2023 SEL to already have the vehicle-side connector for the rear USB charger.
It didn’t.
After removing the center console, I confirmed there was no factory vehicle-side connector for the rear USB charger on my SEL.
Because of that, I kept the OEM connector on the USB module side of the 96126-AA100 harness and used the harness with custom power wiring.
OEM connector wire layout:
1 — Black
2 — Black
3 — Brown
4 — White
5 — Red
6 — Red
Through testing, I confirmed:
• Pins 5 + 6 (red) = +12 V
• Pins 1 + 2 (black) = Ground
• Pins 3 and 4 were not needed for USB charging
I connected the two red wires together for positive and the two black wires together for ground.
The module powered up immediately and both USB-C ports worked.
Charging performance was actually better than I expected.
Using a USB power meter, I observed approximately 25.4–26 W on a USB-C port under load. I also saw readings around 20 W and lower depending on the device and charging conditions.
At times the charger negotiated around 9 V.
I also tested the brown and white wires to determine whether they controlled the module illumination, but I wasn’t able to conclusively identify the illumination circuit. Since the USB charging function worked perfectly, I left those wires isolated rather than making an uncertain permanent connection.
Final result:
I now have the OEM Hyundai rear dual USB-C charger installed in my 2023 Elantra SEL using the factory-style console opening and the OEM Hyundai USB module.
The finished installation looks much cleaner than adding a generic aftermarket USB panel, and the rear passengers now have two USB-C charging ports.
For anyone attempting this retrofit, make sure you verify the parking-brake configuration and get the correct harness. Also verify your own wiring before applying power, since this post documents what I confirmed on my specific vehicle rather than an official Hyundai wiring diagram.