kellyxxx

Turned my car on today and was greeted with a Automatic Rain Sensor Malfunction error see owners manual. The wipers are working perfectly and nothing in manual. The Audi is a 2019 A5 coupe. Anybody have any ideas?

SMac770

Scan for DTCs with VCDS or such, see what the car is actually saying behind the generic text message.

kellyxxx

Ok I got error code B136604. When I look at the sensor it looks like the clear plastic has bubbled up a bit.

SMac770

https://www.audizine.com/forum/showt...c-code-B136604

Seems to be the same scenario.

kellyxxx

Those rain sensors are not cheap. I think I better start searching for 1 online someplace.

kellyxxx

That sensor seems to also control the auto turn on lights when it gets dark.

J. Patterson

Has your windshield ever been replaced? The gel pad between the sensor and windshield must be replaced. Generic gel packs don’t always work and the OEM is pricey. A5 S5 uses the round one as I recall. I had to replace the sensor AND the pad after a windshield guy damaged the sensor replacing the windshield.
(AUDI A3 A4 A5 A6 A7 Q5 Q7 TT Windshield Rain Sensor Adhesive Gel Pad 8U0-955-609)

SMac770

Yes, the RLS is the "rain / light sensor". It provides the data used for the Auto setting of the headlights, as well as the rain sensitive intermittent wipers.

https://www.ilcats.ru/audi/?function...01&language=en

You see the sandwich is the mount 9, built into the glass, then the gel foil 13, then the sensor 12, then the retaining clip 14. So if your sensor is fine, it could be you just need to dismount it and renew the gel foil. Or you might have some other issue. Note, the RLS has its own fuse, fuse 12 in column "2" under the dead pedal.

SMac770

Also, an MY19 A5 is a B9 vehicle, not a B8 vehicle. So this forum in the future: https://www.audiworld.com/forums/aud...cabrio-b9-220/

kellyxxx

I bought the car used and have no idea if the windshield has been replaced.