Rain/light sensor postion sensor fault

^^^mlody: Here is a very cut-down version of the wiring diagram for your rain-light sensor

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As you can see, it's a very simple circuit. Your screenshot suggests that there is enuff volts @ the +ve voltage supply pin ("Voltage 12.2 V)- which is on pin#1.

Your fault is "static" which means that it is permanent and the error has the feel of not being a coding problem. If it was my car, I would examine the integrity of the connector on the sensor to make sure that it's OK. I would also use a multimeter to check the T30 voltage and importantly, I would look-at the earth pin potential. Finally, I would make sure that the actual sensor is sitting correctly on the gel pad (up against the windshield glass.

Here's how VW says you should get access to the sensor:


Don

^^mlody: For clarity, I'm just hypothesizing - guessing really.

Yes, you can just pull-apart the male/female connection without disconnecting the battery. The official VW method is ultra-conservative; because the voltage supply is "T30", it's directly connected to the battery - which means that the wire is live regardless of the ignition switch position. Just make sure that you don't short pin#1 to any metallic surface with the connector pulled apart. If you do short pin#1, the relevant fuse is in position #8 on the fuse block that's under the steering wheel if you have a LH drive car and it's behind the glove box on a RH drive car


The other factor that I didn't mention is that the Body Control Module which is the master module for the sensor continuously monitors the sensor for faults. This means that when you pull apart the connector, an error will likely be recorded in the Central electrics module @ address hex09. This error should be easily cleared after you re-connect the wires.

Yes, about "check voltage in T30"; likely doing this will just confirm the screenshot measurement. It's entirely your decision whether to proceed with this check - but it's an easy try (I would do the check for completeness). I'm not sure what is meant by "going from" - but pin #1 is connected to a wire that terminates at the fuze-box and ultimately is connected to the battery +ve terminal.

Yes about "check earth pin potential"; set the multimeter on the "continuity" function and check between pin#2 and any good metal point on the car frame.

Yes about the gel pad question. But you need to be careful not to damage, or rip the pad when removing the sensor. Also, make sure that dust or other detritus doesn't attach itself to the pad (keep it clean). If you can't see an obvious misalignment problem in the sensor's seating position when you remove the cover, my hunch (again-guess) is that you probably need to replace the sensor. But before you decide to throw money at the problem, it's probably prudent to try to re-seat the sensor (it costs nothing but your time - if you don't damage the gel pad)

Don

Hi, sorry can’t help with sensor prob,
However,, how do you disable start stop by temperature!?

Hi,
I have one more question. According to OBD, my sensor is 5Q0955547.

I know that golf was fitted with 5Q0955547A and later 5Q0955547B. I read that newer models will not be able to activate the automatic window closing function in the rain. which sensor is best to buy? 5Q0955547, 5Q0955547A or 5Q0955547B? And if I buy a different one then 5Q0955547 I will have to change something in OBD, or system detect which sensor I installed?
Thanks!

I have had the same problem for months now, but the anomalous thing is that the closing in case of rain works regularly, the lights in case of rain work but the automatic wiping does not, therefore the srnsore works. I believe there is some conflict with other enabled features.