Audi S5 Dead Wipers: Switch vs Motor Mystery Fix

Had similar issues on a 2014 Audi S4 last season. The symptoms matched exactly, wipers completely non-functional with stored error codes. Initial diagnosis pointed to the wiper switch, but after testing it turned out the wiring harness had deteriorated where it passes through the steering column. The actual fix required replacing the complete wiper motor assembly and a section of the wiring harness. The rain sensor was still functional, but the corroded wiring prevented proper communication between components. This is a known weak point in several Audi models from that generation. The repair was significant since accessing the wiring harness required partial dashboard removal. Not something manageable as a DIY job unless you have specialized diagnostic tools and extensive experience with automotive electrical systems. For proper diagnosis, the shop needs to check: 1. Wiring harness connections at the motor 2. Steering column wiring integrity 3. Rain sensor functionality 4. Cruise control module interference (they share some wiring paths) This turned out to be more complex than a simple switch replacement, but once fixed, no issues since then.

Thanks for sharing that detailed insight about the wiper system repair. The wiring harness issue through the steering column sounds exactly like what I am experiencing with my S5. I am relieved to hear it was fixable, though it seems more involved than just a faulty wiper switch as I initially thought. Would you mind sharing how much you ended up paying for the whole repair? Also, have you noticed any other electrical issues with the turn signal or other systems since the fix? Just want to make sure I am prepared for what might come up during the diagnosis.

Good news, my issue ended up being much simpler than the full wiring harness replacement I initially thought was needed. After having it properly diagnosed, the problem was traced to a loose connection where the wiper switch connects to the steering column wiring. The repair shop found and fixed the faulty cable connection in about an hour. Total cost came to 95 Euro, which was a relief compared to what a complete wiring harness job would have cost. The turn signal, cruise control, and all other steering column electronics have worked perfectly since the repair. No related electrical issues have popped up in the months following the fix. This really shows why proper diagnosis is important, what seems like a major wiring harness problem can sometimes just be a basic connection issue with the wiper switch. The repair has held up well, and the wipers now function exactly as they should.

I took my S5 to a trusted mechanic last week and I am glad I asked for advice here first. The issue turned out different than expected. While checking the windshield wipers, they found the wiring harness was intact, but there was a failed control module in the steering column that was disrupting signals to multiple systems, including the wipers. The repair took about 3 hours and cost 480 Euro including parts and labor. They also discovered and fixed a loose turn signal connection while they were in there, which I had not even noticed was starting to act up. Everything is working perfectly now, both the wipers and all other steering column controls. Much better outcome than my previous bad experience with another shop that wanted to replace the entire wiring harness without proper diagnosis. Really pays to get informed before heading to a mechanic.