DIY - B8 Auto Dim Mirror and Rain/Light Sensor (RLS)

[haroulli]

Due to demand I'm in the midst of the DIY but I figured I'd publish my parts list. This does not include tools used.
Do not follow my parts list Blindly, you will need to purchase whats right for your car and its interior color etc.
I did a lot of googling and scoured eBay here, in the UK and in Germany.

1x VCDS
1x Premium Plus / Prestige Windshield with larger Rear View Mirror Mount and Rain sensor, sorry no part number
1x Rain sensing, light assist - Harness - part number 37140
1x AutoDim Mirror for Single Zone A/C 8K0 857 511E J50 I purchased one with Headlight assist, this does not function.
1x Light Switch with Auto and Fog Light Option 8K0 941 531AL
1x Rear Vier Mirror Cover Cap 8R0 857 593J 50 This part is for a Q5 and is too long, I had to cut it to size
1x Wire Conduit Cover 8R0 857 593A 4PK This part is for a Q5 and is too long, I was able to tuck it behind the headliner
1x Rain/Light sensor 8K0 955 559 (do not get any with letters at the end as they may not work, I found out the hard way)
1x Gel for rain sensor 4E0 955 609
1x Rain Sensor Retaining Spring 4F0 907 971A

[haroulli]

I am not liable for what you do with these instructions or their accuracy. This is not an easy mod and will take time, patients and wiring knowledge

1. Install Auto Headlight Switch
   Remove the steering wheel dash by removing the fuse cover and unscrewing the 3 bolts indicated. Then pull to remove
   
   
   You can then push the switch out from behind with your hand, disconnect the cable and install your new switch, its a straight swap.
   
   
   
2. Run your harness to the mirror
   
   You will need to remove the A Pillar cover, so that you can run your harness through, be very careful as you have an airbag there. You don't need to remove the whole thing just enough to get the harness in.
   
   
   Remove your sunroof controls
   
   
   This will allow you to connect wire T8b/6 to the 8-pin connector and connect the cable for the Auto Dimming Mirror to Pin 6
   
   
   You will then want to push your two other connectors through to the windshield side ready for your mirror and sensor.
   
   
   
3. Run your harness for the AutoDim side mirrors (if equipped/applicable) to the fuse and front CAN
   On the harness from Kufatec it also has to wires for the auto dimming side mirrors (T20/17 - PIN 17 High and T20/7 - PIN 7 Low). I did not run those and just left them in a loop. However they run the passenger side and require the glovebox to be removed and connected to the Red 20 PIN connector in position 17 and 7.
   
   
   
   
4. Run your harness for the Rain Sensor and Power for the Auto Dimming Mirror
   For the rain sensor now run the T16b/2 - PIN 2 wire to the beige 16 pin connector. This is under the steering wheel on the left side. You will need to carefully remove the beige cover and connect the wire in the PIN 3 position.
   
   
   For PIN 1 I was able to tap into the homelink which is ignition only as the carrier ST2 fuse 12 is blank.
   For PIN 2 I used the bolt on the side of the fuse area which worked out fine.
   
   
5. Run the Humidity Sensor wire T32c/32 to the trunk CAN
   There is also another which is for the humidity sensor, this is only required if you have 3zone A/C and you purchased the 3zone Rearview Mirror that requires that connector. I ran it however it is not connected. This needs to be ran to the right hand side of the trunk and connected to the pictured connector in position PIN 32
   
   
   
   
6. Install Mirror on new Windshield with trim
   I can't tell you how to replace your windshield and that should be left the pros. But once it arrived I handed the mirror to the installer along with the hardware and he was able to attach it for me. The mirror does go on with a quarter turn to the right, making sure the black backing trim is on first with the gel pad and sensor and sensor clip.
   
   
   Once everything is in place it should look this
   
   
   
   
7. Coding with VCDS
   To enable the Rain and Light sensor
   Adresse 09 (Control Unit)
   Byte 22 - Bit 0 to 1 = xxxxxxx1
   To enable Coming Home, Leaving Home
   Byte 06 - HEX: AF (depending on your version of VCDS it make have the check box option)
   
   

Sources:

Instructions from the German Forum
Coding Help for Rain and Light Sensor and CH/LH
Rain Sensor and CH/LH Dicussion
Barebones Install with no P+ Windshield

[dracolnyte]

bravo to you for edging this out. unfortunately it seems too hard for me so im just gonna back out and give up to buy a car that comes with it build in lol

wait if i dont want no humidity/rain sensor and just want the coming home leaving home function, what is the easiest way? just connect my light sensor to pin6?

[haroulli]

bravo to you for edging this out. unfortunately it seems too hard for me so im just gonna back out and give up to buy a car that comes with it build in lol

wait if i dont want no humidity/rain sensor and just want the coming home leaving home function, what is the easiest way? just connect my light sensor to pin6?

It is a lot to do if you want to do it right using the Kufatec Harness for both the AutoDimming Mirror and the Rain and Light Sensor (RLS). Otherwise you just buy this harness from them which is just for the RLS.

Rain and light sensor Harness - part number 39978

You can then just kinda of tuck in the base of the RLS into your headliner, you will still need the Auto Light Switch option and the VCDS. I did this while I was waiting for my mirror and windshield. It worked out ok for the Light feature. For the rain feature to work properly it needs to touch the glass using the gel pad. The one I purchased was not sticky (mine was aftermarket from the UK) however the one the windshield guy had on him was, again his wasn't OEM.

The humidity sensor is not part of the RLS, its just a function of the mirror with the 3-zone A/C system. However in the US if you have 3zone A/C you have RLS so its really redundant. I ran it but its not wired in but it is included in the instructions.

Thanks,

[dracolnyte]

great thanks. i dont have 3 zone and i already have vcds and the auto light switch. guess i just might be doing this then :D

[haroulli]

great thanks. i dont have 3 zone and i already have vcds and the auto light switch. guess i just might be doing this then :D

If I hadn't of gone in the direction I did I would have bought this! So if your looking for Auto Dim but don't fancy messing around with the windshield. Of course you still need to wire it!
http://www.ebay.com/itm/Auto-dimming...3fea1f&vxp=mtr

[droesch99]

totally great article, helped a lot. This is almost exactly what I want to do. I ordered the harness, auto headlight switch, and RLS mirror which is somewhat wired already. Did you wire and get working the auto headlight feature..? I saw the other connections you posted, and unless I missed it didnt see what wires tell the "auto" lights to turn on and where they hook up..?

I've been looking around the forums and most people just wire the dimming/compass feature, so far havent been able to get what wires control the auto lights and where do they go..

[meatheadmike]

It is a lot to do if you want to do it right using the Kufatec Harness for both the AutoDimming Mirror and the Rain and Light Sensor (RLS). Otherwise you just buy this harness from them which is just for the RLS.

Rain and light sensor Harness - part number 39978

You can then just kinda of tuck in the base of the RLS into your headliner, you will still need the Auto Light Switch option and the VCDS. I did this while I was waiting for my mirror and windshield. It worked out ok for the Light feature. For the rain feature to work properly it needs to touch the glass using the gel pad. The one I purchased was not sticky (mine was aftermarket from the UK) however the one the windshield guy had on him was, again his wasn't OEM.

The humidity sensor is not part of the RLS, its just a function of the mirror with the 3-zone A/C system. However in the US if you have 3zone A/C you have RLS so its really redundant. I ran it but its not wired in but it is included in the instructions.

Thanks,

I'm also just looking to get automatic headlights feature and don't really care about the mirror or wipers. So all I would need is the switch, light sensor, the gel, and the harness for only the light sensor, right?


Just want to clarify on the steps...

So the switch is just a straight plug and play swap (that part should be easy enough). But then I'm not fully clear on how to connect the light sensor & harness:




Looking at the picture, I assume the black clip goes into the light sensor. But what about the other 3 wires... does the one with the thinnest end go into pin 6 of the sunroof controls? Then where do the other two get run?

Sorry if dumb questions, but I couldn't tell from the pics since it looks like the ends of the wires are different on this harness.

great thanks. i dont have 3 zone and i already have vcds and the auto light switch. guess i just might be doing this then :D

Were you able to get this working?

[dino92]

anyone have diagram for install rain/light senor and autodimming mirror

[snaky69]

Thread jacking here for maximum views. I have a canadian model with a humidity sensor in place, but no auto lights or wipers. From what I gather a straight sensor and switch swap along with some vcds would get me auto lights and wipers? No extra wiring needed?

[Smac770]

Correct. The 559 is the humidity only sensor. 559C is the rain/light/humidity sensor. They both use the same 3-pin plug, and the same connections from that plug to the car. There is certainly going to have to be recoding done on the J519. The RLS shows up as a separate submodule, at least for a B8.0.
But then the RLS sensor is connected to the J519 T16b pin 2 as well as the J400 T4g pin 4. You won't have a J400 since you didn't have rain sensor wiper control factory. You'll need to get one. Pin 1, 12v from panel C, row 2, fuse 9. Pin 2, ground. Pin 3, to that connection from sensor T3c pin 3 to J519 T16b pin 2, called "connection 11 in the main wiring harness".
I don't really understand how the J400 works. It has power and ground and a single connection to J519 shared with the G397 RLS sensor and the G355 humidity sensor. So what does it actually do? This thread might assist; I didn't bother reading down into it to see what was actually said.
https://www.audizine.com/forum/showt...g-VAG-COM-Help!

[snaky69]

Correct. The 559 is the humidity only sensor. 559C is the rain/light/humidity sensor. They both use the same 3-pin plug, and the same connections from that plug to the car. There is certainly going to have to be recoding done on the J519. The RLS shows up as a separate submodule, at least for a B8.0.
But then the RLS sensor is connected to the J519 T16b pin 2 as well as the J400 T4g pin 4. You won't have a J400 since you didn't have rain sensor wiper control factory. You'll need to get one. Pin 1, 12v from panel C, row 2, fuse 9. Pin 2, ground. Pin 3, to that connection from sensor T3c pin 3 to J519 T16b pin 2, called "connection 11 in the main wiring harness".
I don't really understand how the J400 works. It has power and ground and a single connection to J519 shared with the G397 RLS sensor and the G355 humidity sensor. So what does it actually do? This thread might assist; I didn't bother reading down into it to see what was actually said.
https://www.audizine.com/forum/showt...g-VAG-COM-Help!

So in other words, I should be able to get auto lights fairly easily, rain sensing wipers not so much.

[Smac770]

https://www.ecstuning.com/b-genuine-...or/8k1955023e/
Look at the second pic with the black box on the motor with the four pin plug; that's the J400. Maybe they are always there but not connected? Or maybe the connection is there from the J519, just not linked to the RLS when it's not there? Not sure.

[snaky69]

https://www.ecstuning.com/b-genuine-...or/8k1955023e/
Look at the second pic with the black box on the motor with the four pin plug; that's the J400. Maybe they are always there but not connected? Or maybe the connection is there from the J519, just not linked to the RLS when it's not there? Not sure.

I’ll take a look under my cowl. I have a VCDS cable so recoding isn’t an issue. I was more wondering about it working electrically.

[snaky69]

I got the switch installed, straight swap. Tried the sensor by just having it dangle by the wires. Surprisingly the rain detection works, passing my hand in front of it made the wipers go.

Unfortunately no dice on auto lights. Maybe I got a dud?

[snaky69]

Quick update.

I had a buddy's S4's that has auto lights long coding so I looked at each byte carefully and checked for differences. Got it to where the "auto" position turns on the lights. It's been cloudy and rainy at the moment and I don't know if the current coding leaves them "on" all the time or if it's just the lack of light.

Coming home and leaving home seem to work great.

[audiyadosir]

I have a 2009 A4 B8 2.0T Quattro black on black with a tan Murrow, which I replaced. The autodimming, compass included rear view mirror has an intermittent to constant “cannot reach autodimming, rainsensor mirror.” come up in VCDS constantly.

Do I have to recode the actual mirror in VCDS for a straight swap? I made sure to buy an 8 pin (or 6 or whatever it was) connector from Chris at Force5. I took down the old one that had literally disintegrated into bits on the inside plastic. After one bit was broken it faded day by day and was just dangling by the ball and wires at the end like a bobblehead.

I plugged in the new one and reset the Sector so the compass works, the rain sensor works on occasion, but usually needs a jump start of me turning off the wipers and back on, and auto-dimming is hit or miss, even though side mirrors autodim all the time (I think). Seems like a pinched or worn wire maybe? if y’all know it’s an unfamiliar piece and I have to put in codes or anything into VCDS (like when you swap instrument panels) please holler!

(if anyone can help me get my front passenger door open when it won’t open by the inside or outside handle and the door lock actuator was replaced, but clearly not working, I’d appreciate the help - I know I can start a new thread and hope this isn’t hijacking this one - just thought I’d ask while here)


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[Smac770]

I don't know about all the rest of your issue; I get no problems talking to the RLS in VCDS autoscan.

But on your comment about needing to "jump start" the auto wipers; I have to do that myself as well and my car has full RLS functionality from the factory. I suspect that when the weather is such that the wipers would have been on when you start the car, somehow the electrical logic gets confused. If I move the sensitivity toggle on top of the stalk to anything else and back where I want it, then the wipers kick in. I do not see this issue when the car has been running and then the weather should incite the wipers to activate. But if you're having to "jump start" it often or every time, then yeah, something seems off.

As for your door, I suspect your local fire dept has a tool that can help you out. :-)

[joshmc10000]

Hey guys,

First of thanks for such a great thread - this really helped me to get this far with the retrofit. But I am having some troubles in the final stages of the retrofit

To date I have done the following;
- Connected the new RLS sensor up on the mirror, and ran the loom down towards the drivers side door (A piller)
- Connected the power to the fuse box, with a 5A fuse - in the beige socket which has the label "rainlight sensor"
- Connected the eather wire to the earth location, down near the pedals
- Connected the source/feed wire (T16b/2)into the to the beige 16 pin connector in the PIN 3 position.
- Fitted the new "auto" headlight switch into the dashboard
- Have coded with VCDS; coming/leaving home and the rain/light sensor.

Since doing all of this, I am now getting a "malfunction with automation headlight/windscreen wipers" error up on the dashboard.



My suspicion is that did not connect T16b/2 correctly, I just slide the cable into the 16 pin connector. Does this need to be plugged in with a proper clip or something? If so what is this part called/part number?
I thought as a test it would be OK just to slide the cable in, rattached the housing, and click the 16pin cable back into the control box. But this does not seem to work :(

This is how it is connected (In PIN 3, between the two existing purple wires)
IMG_2892.jpg

If it is not this, then I guess it could be the sensor itself that is faulty?

Either way, does anyone have words of wisdom that could help me on this? Thanks!

[Smac770]

"malfunction with automation headlight/windscreen wipers", generic message. What's the actual complete DTC from a vehicle scan?

Wait, back up. That pic of the plug, did you just slide the bare wire into there? You didn't crimp a terminal onto it?

[Smac770]

I've not really looked through what instruction set you're following, but I think that wire you have, you need to combine it with the wire on pin 2. Pin 3 I couldn't decipher, as that's for the parking sensors.

"to J519 T16b pin 2", yes, there's already a wire in pin 2, your new wire needs to splice to that wire so they are all connected together. Basically it's a LIN bus and all the players need to be on it; you're adding a new player.

I don't know how others have elected to do the splice; I would be likely to try a t-splice, such as the T1 style here https://www.alightings.com/product-c...voltage-12-24v. The wires are small, .35mm^2 or 22awg (not sure if awg means anything over there).

[joshmc10000]

The error is still there since I coded it via VCDS. I am sure if the logs will help since I have unplugged the LRS sensor cable for now, as I needed to drive the car.

Correct, I didn't do any crimping which I felt was wrong and left it for now. A couple of questions;
- What is this crimp called? (or what does Audi/VW call it) - can someone please link me with where I could buy one?
- What pin slot "should" it go in, PIN 2 (the existing purple) or PIN 3 (where I tried)

[joshmc10000]

Just saw your reply - OK this is making more sense now. I will try splicing into PIN 2, and give that a shot. Thanks a bunch Smac770 - will keep you posted!

[joshmc10000]

OK so I have now tapped into PIN, tried it again - however the same error...

This is the error in VCDS


01520 - Rain and Light Recognition Sensor (G397)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 3
Fault Frequency: 2
Reset counter: 132
Mileage: 134182 km
Time Indication: 0
Date: 2020.05.19
Time: 21:20:00

[Smac770]

Well, you don't post which address (control module) the DTC is from, but J519 is a reasonable expectation.

I assume the harness in the pics is the aftermarket harness for adding the RLS. You have a 3-pin plug on one end, which plugs into the RLS, and then three ends, one bare, one with a ring terminal, and one with a pin terminal.

On the plug, it should be clear which pin is 1 vs 2 vs 3. I expect the ring terminal is on the wire in position 2, which should be brown. Ok, nevermind on the colors, that aftermarket harness is not using any of the proper colors.

That leaves the bare wire and the pin terminal wire. The wire on position 3 should be to that T16b pin 2, the LIN bus involving the J519 (LIN master) and the G397 RLS and J400 wiper motor. The wire on position 1 is the one that goes off to 12v, fuse 12 in row 2 in panel C (left end of dash).

The car is not going to have any idea if the RLS has power or ground issues, it's only connection is the LIN bus line. And it says it cannot establish communication. So the RLS could be not getting 12v, could be not connected to ground, or could have a wiring problem to the LIN bus, or could just be broken. If you can get back to the plug end of that harness, check for 12v on pin 1, ground in pin 2, and check for some kind of DC voltage (might be around 1v or around 12v or bouncing back and forth) as you do things that would trigger LIN comms, like turning on the windshield wipers. At this point, the pin 3 on the RLS plug is just a tap into the existing LIN between the J519 and J400. If all the stuff looks good and then you put the plug into the RLS unit, the RLS should come on and attempt to interact on the LIN bus. But to know anything more, you'd need a scope with a LIN decoder (logic analyzer).

[joshmc10000]

@Smac700 -Thanks again. I managed to check/fix some of the wiring and have cleared the sensor errors both from the dashboard and VCDS - so seems like good progress. But it seems the auto hadlight and wipers still do not activate.
Have sent you a PM with the VCDS logs

[Smac770]

Josh, PMd you back.

I'd go into Measuring Blocks or Advanced Measuring Values for address 0x09 (the J519) and see what the car is reporting for the sensor array. That's block 22, or "infrared brightness detection" and "frontal brightness detection". See if it moves when you put a flashlight over the sensor, see what the values are like in the sun, in the shade, in a garage. I don't have an infrared "flashlight" to test with. Also, I forget which block, but it's "Light switch (E1) Position)", make sure it's reporting all the positions. On mine, 1 for off, 2 for auto, 4 for park, 8 for on.

Without a LIN logic analyzer, the natural direct attack of wiretapping the conversation between these three units is not possible.

[joshmc10000]

Thanks Scott. When I chance across the weekend I will check the Measuring Blocks/Values and see what I can dig up!

[joshmc10000]

So a quick update;

Jumped into VCDS Measuring blocks
- Here is the results from the headlight switch check; same as you Scott (1 for off, 2 for auto, 4 for park, 8 for on). So the switch is good.
- Jumping into Group 022. Could see the "Frontal brightness detection flucuating between a measurement of 2-3 with the garage light on.
Infrared brightness detection showing as 0, so I guess I need to drive outside to get some UV. I will try test this in the next couple of days.

[Switch.pngSensor.png

Just to confirm the lights should activate when I switch off my garage lights, right? Or do I need to be out driving and have real light, before coming into my dark garage?


Interestingly, when I walked in front of thr car with my phone light, the wipers started to go off, so looks like something has kicked into gear :)
I got some water and sprayed it on the windshield and can confirm the auto-wipers are now working.

Now, just need to get these bloody auto-headlights working!

[Smac770]

Headlights come on in any dark. That's why I don't leave my car on auto, hate the headlights coming on when I start the car and when I pull into the garage.

It's 3pm, sunny, but my garage faces north, so no direct sunlight into it, with the car in the garage pulled in with the front towards the wall and the door open, I'm reading 17-19 for frontal brightness. If I turn on my 5000 lumen overhead light, it bounces around in the upper 30s and the 40s. My headlights come on in either case when I turn the dial to auto. If I point a flashlight at the sensor array, I get 200-400, depending on how shaky I am. The headlights go off after about 20-30 seconds. If I remove the flashlight and the reported value drops, the headlights come back on after 40-60 seconds. I wasn't counting. The max value is 1021.

Yeah, the J519 seems to see values from the RLS, and is seeing a light/dark conclusion from the RLS (which is based on those various coding values for tweaking the interpretation of the raw values into a light/dark conclusion). But if it's not activating the headlights, that's about the J519 rather than the RLS. I'm not sure what you might check at that point.

[snaky69]

So a quick update;

Jumped into VCDS Measuring blocks
- Here is the results from the headlight switch check; same as you Scott (1 for off, 2 for auto, 4 for park, 8 for on). So the switch is good.
- Jumping into Group 022. Could see the "Frontal brightness detection flucuating between a measurement of 2-3 with the garage light on.
Infrared brightness detection showing as 0, so I guess I need to drive outside to get some UV. I will try test this in the next couple of days.

[Switch.pngSensor.png

Just to confirm the lights should activate when I switch off my garage lights, right? Or do I need to be out driving and have real light, before coming into my dark garage?


Interestingly, when I walked in front of thr car with my phone light, the wipers started to go off, so looks like something has kicked into gear :)
I got some water and sprayed it on the windshield and can confirm the auto-wipers are now working.

Now, just need to get these bloody auto-headlights working!

Infrared is for rain sensing only so you can disregard this as far as the lights go.

I retrofitted my car from the plain humidity sensor to a RLS. If there’s anything you’d like to me to look at on my end let me know.

My lights would be on all the time once I got it working, I seek to recall having to enable «*adaptive lighting*» for them to work properly. I can share full module coding if need be.

[joshmc10000]

OK guys, I have some good news. Today, I hooked up VCDS again and started to review the settings to see if I missed anything. Turns out I did - I forgot to enable "Assistance Driving Light active". Attached are the settings I used.

After I did this, I then noticed that the "Auto" switch turned a different colour and the headlights came on. I locked the car and the coming home/leaving home also started to take effect.


Thanks again for the help! :)

[snaky69]

OK guys, I have some good news. Today, I hooked up VCDS again and started to review the settings to see if I missed anything. Turns out I did - I forgot to enable "Assistance Driving Light active". Attached are the settings I used.

After I did this, I then noticed that the "Auto" switch turned a different colour and the headlights came on. I locked the car and the coming home/leaving home also started to take effect.


Thanks again for the help! :)

That's the one, good on you for figuring it out. I couldn't quite recall the name!

[Audi 4 Life]

Was reading thru this and noticed nobody was doing this for HBA? Seems kinda odd to go thru all that and not add HBA mirror.

Infrared is for rain sensing only so you can disregard this as far as the lights go.

I retrofitted my car from the plain humidity sensor to a RLS. If there’s anything you’d like to me to look at on my end let me know.

My lights would be on all the time once I got it working, I seek to recall having to enable «*adaptive lighting*» for them to work properly. I can share full module coding if need be.

Can you share more info ? On this did you just leave the old hunidity sensor unplugged?


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[snaky69]

Was reading thru this and noticed nobody was doing this for HBA? Seems kinda odd to go thru all that and not add HBA mirror.





Can you share more info ? On this did you just leave the old hunidity sensor unplugged?


Sent from my SM-G960U using Tapatalk

It’s all one unit. I replaced the plain humidity sensor with rain/light and humidity sensor. Same pinout, all I needed was VCDS to get it going.

[Audi 4 Life]

It’s all one unit. I replaced the plain humidity sensor with rain/light and humidity sensor. Same pinout, all I needed was VCDS to get it going.

Ah I see thanks for clarification. Thats good news. I wasn't sure if pins needed moving.

I was getting confused because nobody is retrofitting HBA in this thread and I thought the harness was made for all of it. At least the one I have is.

https://www.kufatec.com/en/volkswage...for-pq35-38052

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[dejan643]

Sorry for late replay.But I ordered Single zone mirror(6 pin) and Kufatec Harness,but Harrnes is 8 pin :/.What can i do ? new harness or new mirror

[Smac770]

Is this B8.0 or B8.5? What is the actual part number of the new mirror?

[dejan643]

Is this B8.0 or B8.5? What is the actual part number of the new mirror?

B8 ,Mirror No.: 4F0 857 511 4FK

[Smac770]

So for a B8.0 (since all B8.0 and all B8.5 are "B8"), 4F0... mirrors are not auto-dimming. The only 4F0... mirror I see listed is 4F0 857 511 AA (the 4PK is just a color code, for black in this part).

So:
4L2 - manual dimming
8N6 - intermittent wipers with RLS (G397) without HBA
9AK - basic climate control system (ie, no humidity sensor, G355)

But a manual dimming mirror has no plug on it. And the B8.0 RLS has its own 3-pin plug. Had it been an autodimming mirror without humidity sensor, then it would have a 6-pin plug. Reconfirm the part number.