teenwolf80

I purchased my 991 last year from a dealer in CA (I’m in PA). As soon as I received the car, I noticed that the rear view mirror was loose. I took it to a friend-of-a-friend who works on classic Porsches, and he secured it back into place. It wasn’t until a month or so later that I noticed the rain sensor wasn’t working for the wipers. I thought maybe it was user-error, but I eventually got fed up enough to read the manual and realized it was the sensor. I don’t know if the sensor worked prior to the mirror being reaffixed, as I had never driven in the rain.

My local dealership told me that I needed to replace the entire windshield. Not wanting to do that, I found a troubleshoot for the issue online where you can use your phone’s camera to see if the infrared light on the rain sensor is, in fact, lighting up. Well, not only do I not see the infrared light going on, but my phone is actually activating the wipers! Every time I hold my phone up to the sensor, the wipers wipe. So, now I’m really confused!

I still feel that it’s as simple as the rear view mirror being put back somehow interfered with the sensor. Anyone have any advice on how to proceed? This is very frustrating!

DBH

Don't mean to be cute but, if you see raindrops on the windshield...
BTW, I don't have rain sensors.

Pb Pedis

I didn't even know these cars came with rain sensors?

VII7

You can try to recalibrate it but most likely it's misaligned and you need a new windshield.

barncobob

dont drive in rain

991_T

This^^^ and have you had the Blinker Fluid system flushed and replaced ?

Cuda911

Has to be one of the most useless features ever invented.

Noah Fect

I feel like I'm taking crazy pills. Of course there's a rain sensor. It is effective, it is not the least bit "useless," it works well at reducing "pilot workload," and it is worth keeping in working condition. If you can't provide more helpful replies than this, or if you're the sort to religiously avoid driving in the rain, it'd be preferable to say nothing at all.

Section from the 991 service manual showing how to remove/install the sensor attached. I would take it off the car and reinstall it according to the instructions, which don't seem too involved. The sensor mounts on an adhesive plate, but the adhesive sticks to the windshield, not the sensor. It doesn't appear to be necessary to remove it from the windshield, if I understand correctly.

Porsche_nuts

it works well at reducing "pilot workload,"



the amount of "pilot workload" is the same as turning on your turn signal, except you are using your right hand

all the same the pdf is extremely helpful

Elmiko

Here's a YouTube vid that explains the operation of the 991.1 wipers:

Live Steam

Here are som options. Link