Hyundai cable harness, felt cost to high

Hello, I’m driving a Hyundai i30 gd 2012 intro edition and with the right outside mirror the plastic from the led flasher has gone defective which means he had no longer flashed. it was already the led unit + plastic exchanged and he then flashed briefly again but then again no more, now when repairing came a message that probably should be in the door of the complete wire harness and it probably costs 400€+. my breath feels a little funny, has one of you with it e drivages and whether such a thing is really so expensive ? above all it just doesn’t flash, fold up, mirror high down, mirror heating, electric window lifter etc everything still works, only the blinking stop doesn’t… and even such a little wired zodiac on the door so expensive?