What Input Wires are Used for a 2-Wire System On a 2015 Mercedes-Benz GLA45

Question:

I have a 2015 Mercedes GLA45. I followed your YouTube video for installing a zci trailer harness for a gla250. The wire colors given in the video are different to mine. It seems like I may have a 2 wire system with brown being the ground on both left and right harneses. That leaves me with these wires: Left Yellow/white Gray/black Brown Right Gray/red Orange/gray Brown Can you tell me which wire connects to which pickup sensor?

asked by: Dinesh H

Expert Reply:

The ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector and Installation Kit # 119250KIT is a universal wiring harness and will work with a 2-wire, 3-wire, PWM, and multiplex wiring systems.

With that being said, I went ahead and checked the instructions and the input wire used should be yellow to left turn/brake, green to right turn/brake, and brown to vehicle tail wire.

expert reply by: Bryce D