Thomasocallaghan

Thanks for that Andrehj, I suppose hindsight is great after finding the issue!! I was also stuck with another issue with my Windows and central locking giving trouble.. the fix was actually a broken wire at the passenger front door wiring, which was making the passenger rear window and lock not working.. I had focused on the wiring at the drivers door loom at the hinge side. I know this is a known issue. I will look through a few photos and submit another step by step fix. Kind regards, Tom.

Hi everyone, I own a 2012 superb diesel 2.0L, and the front wipers have been working intermittently for the past few weeks. I wanted to reach out to anybody that has also encountered these symptoms. Before I get on to how I repaired it, I have tried cleaning the contacts behind the wiper switch/stalk, still not working. I replaced the wiper motor J400 type and still not working. I replaced the BCM with the same part number, still not working. Just to note all of these parts were second hand from a salvage yard. The only function working was the windscreen washer jets, not the headlights. I looked through a good few forums on BRISKODA, and to be fair all of the suggestions were good ones to try rectify the wiper issue. If anybody is trying to clean the contacts on the wiper stalk, be careful putting the arm back into place as I broke off a small plastic lug, that operates the pull back washer function. This cannot be repaired easily, and it's not worth the effort as it's tiny. This is why I replaced the full stalk unit(second hand), as a main dealer part is expensive!! So onto the fix... 3 wires coming out of the motor. Live Earth LIN( purple) With multimeter I was reading system voltage on the live connector 12v I connected this wire directly to positive on the battery and got 0v.. so no voltage drop. I did the same with the negative cable on the motor. With multimeter I was reading system voltage when connected to battery positive lead 12v I checked this connector for voltage drop by connecting it directly to battery negative and got 0v The LIN bus (purple) cable was reading system voltage also when using a multimeter to earth of the battery. I read a forum that stated a customer has brought his car to an auto electrician and they found an issue with the wiring loom between the bulkhead and the battery box holder. I removed the wipers, wiper cowl, both sides, I removed the wiper motor, I removed the ECU which is located to the right of the motor. I removed the ECU holder(plastic). I removed the battery. I followed the wiper motor wiring loom and it goes through the bulkhead and down below the inner side of the battery box plastic holder. On closer inspection I spotted the loom was tight against the edge of the holder, and could clearly see green oxidation. I removed the battery box holder and stripped down the insulation around the loom, and found the purple cable was squashed and green with oxidation. This was the cause of my intermittent wiper operation. The high resistance within the cable was causing the issue. I found that the wipers worked at random in the very cold weather, maybe because materials expand and contract in cold weather? I have attached a few pictures to show where the issue was. I found an old breakout box wiring loom from over 20 years ago that had wires the perfect size and color. I just cut out the damage bit, about 4mm of cable and added in new. I used head shrink, but allowed an inch extra long on the cable. I taped up the loom again and used 3/4" qualplex pipe insulation to put between the loom and the battery box holder. I actually grinded off a little bit from the corner of the battery box holder. I put the car back together and it works perfectly, even the headlamp washer jet works again!! I hope this long winded explanation helps somebody. Just to note I didn't have any diagnostic tools, however I've over 26 years experience as a motor mechanic!! I'd say if the system was checked, I'd say it would have read high resistance or open circuit for LIN bus cable, between J400 and the BCM under the driver's side above the clutch and brake pedals.