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Old 07-31-2007, 01:38 AM   #1
Deep Blue
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success: rain/light Sensor retrofit

BACKGROUND
1999-2001 e46 did not come with the rain sensor (refer to as RS) as standard equiped. It was an option depending on your package options. In 2001 and later, BMW upgraded the rain sensor with an intergrated auto light sensor (refer to as RLS). My car is a 2000 M52TUb28 and did not come with the rain sensor. I wanted this option. Here is my retrofit attempt.

KEY FACTS:
-Rain Sensor and Rain Light Sensor used the same exact wire harness and pin connector layout (4 pin)


-The only difference between a NON rain/light Sensor windshield and a rain/light sensor equipped windshield is the presence of the Infared (IR) Filter/receptors that also acts as the mounting bracket. Additionally, there is an black painted area in the windshield that blocks out excess light around the sensor to provide a more accurate reading.


-You don't have to buy a new windshield if you managed to acquired a used IR filter/receptor.

-BMW does not sell the IR filter/receptor individual. There is a part number but that part number is only sold with the conjection of a new windshield. RS IR filter/receptor part number (8-387-433) and RLS IR filter/receptor part number (6-906-431)

RS IR filter/receptor:


RS IR filter/receptor mounted:


RLS filter/receptor:


RLS filter/receptor mounted:



WHO:
People without rain sensor (RS) or Rain Light Sensor (RLS) that wanted the feature.

WHAT:
The rain-driving light sensor has integrated sensors that sense the wetness on the windshield glass and the ambient light. The rain sensor is an optical system. It consists of an optical element bonded on the windshield and an electronic element. The electronic evaluation unit and 4 optical transmitter and receiver diodes are integrated in the electronic element.

WHY:
source: BMW Wiring Diagram Systems (ver 7.0 12/2005)
The rain sensor is activated when the wiper switch is moved to the first stop position. When the rain sensor is activated, visual feedback is given to the driver in that one wiping cycle is executed first. Then, the transmitter diodes emit an infrared light which is guided across the optical element to the windshield. If the windshield is completely dry and clean, the infrared light is fully reflected to the receiver diodes. If there is water or dirt in the area of the optical element on the windshield, full reflection of the infrared light is no longer possible. Part of the light penetrates the windshield so that only part of the light arrives at the receiver diodes. The electronic circuitry detects how much water is on the windshield on the basis of the amount of light that is being blocked out and send a signal to that effect via the K bus. The ZKE basic module then performs a wipe cycle. In the case of very heavy rain, the intermittent operation goes into stage 1 or stage 2 of the continuous wiping mode.

A heating element integrated in the rain sensor prevents misting of the optical element or the diodes. The sensitivity of the rain sensor can be varied in 4 sensitivity stages by means of the knurled wheel on the wiper/washer switch. Each time the adjuster wheel is moved in the "Increase sensitivity" direction (upwards), a wipe cycle is carried out.

When the vehicle is at a standstill, there is an automatic reduction of the sensitivity so that the wiper usually runs in intermittent mode. If the rain sensor fails, the wiper runs at a fixed time interval. For safety reasons, the rain sensor is switched off when terminal R is switched off.

Requirements for faultless operation of the rain sensor are:
No wax smear on the windshield
Wiper blades OK
Windshield glass free of faults in the area of the rain sensor
Optical element bonded free of bubbles with the windshield glass

Initialization

Due to the optical process, the rain sensor has to be adapted to the windshield. This adaptation takes place at initialization.

Requirement for faultless initialization is that the windshield glass is dry, clean and free of defects in the area of the rain sensor.

The initialization is performed using the service function "Initialize rain sensor" in the BMW diagnosis system. In the service function, the adaptation values in the rain sensor are deleted. This is followed by adjustment of the sensor system to the windshield based on the following sequence:
Switching off the rain sensor
Switch off terminal 15 and terminal R
Switch on terminal R and terminal 15 and wait 10 seconds

In the 10 seconds waiting period, the new adaptation values are determined and stored.

Initialization of the rain sensor is necessary:
After replacing the windshield
Fitting a used rain-driving light sensor
Note: a used sensor must be coded beforehand!

Summary:

How does Rain Sensor works?
The sensor emit infrared beams inside windscreen at about 45 degree
The light bounces of the outside surface of the windscreen, and into an optical detector sensor
If water in any form sticks to the outside surface of the windscreen, it disturbs the beams
The microprocessor in the circuit interprets the data and determine how to run the wipers.

How does Rain Light Sensor Worrks?

The driving light sensor consists of two photodiodes and an electronic evaluation unit. The photodiodes are arranged in such a way that both light striking the sensor from the front and light striking the sensor from above (ambient light) are sensed. If there is a change in the light conditions, a signal is sent across the K bus. If the automatic headlights system is active, the light control center switches the headlights on or off. The light sensing is active as of terminal R, independent of whether the automatic driving light system is switched on or off. Adjustment of the driving light sensor on the windshield is by means of coding. This is why a used sensor must be recoded on installation!




SOLUTION
more to follow

HOW
more to follow

Last edited by Deep Blue; 07-31-2007 at 02:02 AM.
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Old 07-31-2007, 01:41 AM   #2
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staying tuned
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Old 07-31-2007, 02:17 AM   #3
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but you do have a rain-sensor compatible windshield right? I wonder how the sensor will look like on a plain windshield...
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Old 07-31-2007, 02:44 AM   #4
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Awesome, how much did the whole project cost?
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Old 07-31-2007, 03:34 AM   #5
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staying tuned too
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Old 07-31-2007, 04:25 AM   #6
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Old 07-31-2007, 08:50 PM   #7
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SOLUTION



The RS and RLS requires four signals for operation: KL R, KL 31, Windshield Wiper Motor Park Signal Feedback and K Bus interface.


KL R =12+ (or ignition que)
KL 31 = Ground
Windshield Wiper Motor (ground, activation)
K Bus

Here is the official wire diagram for both the RS and RLS.



Again, both the RS and RLS (refer to as B57) requires a 4 pin wire harness (refer to as X13084).

pin1----connects to your Fuse #15. It is a 5Amp fuse. The wire harness that it connects to is a 74 pin plug (refer to as x10016). It is black


pin2----connects to your ground (refer to as x10012)


Pin3..... connects to your Pin 14 (K bus signal) in the instrument panel (refer to as A2). The wire harness that it connects to is a 26 pin plug (refer to as X11175).

pin4----connects to Pin 45 in the GM V (General Module 5 refer to as A1).
the wire harness that it connects to is a 54 pin plug (refer to as x253)


Test Results:

Switch to the "Auto headlight" setting on the LCM/LKM (Light control module).


Park car in direct sunlight to see whether the lights will turn on.


Headlight did not turn on:


Cover the RLS with a towel to "simulate" night/dark conditions:



Headlights automatically turned on: SUCCESS!!!



In a few days I will address the HOW part with step by steps instructions. I will include pictures and all the necessary part numbers that are required to built your own rain sensor wire harness to removing and gluing your own IR filter/receptor.

Enjoy

HOW
More to follow


TEASER: Rear Fog light retrofit:

EURO LCM with rear fog lights among other cool things


Notice the Orange Rear Fog light indicator on the instrument cluster/planel?


Picture of the Euro Rear Fog ligths in actions:

Last edited by Deep Blue; 07-31-2007 at 09:00 PM.
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Old 07-31-2007, 10:03 PM   #8
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uhhh... whut?


I wish i was an electronics specialist so I can understand what all those trees in those boxes with the words mean.
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Old 07-31-2007, 10:08 PM   #9
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My car '99 328i premium package has the rain sensor. I've had the windshield replaced and replaced a failed sensor unit with a used one and neither time had to have anything recoded or anything done at the dealership - just plug and play.

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Old 07-31-2007, 10:37 PM   #10
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wow....crazy amount of knowledge
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Old 07-31-2007, 10:59 PM   #11
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Subscribed... looks like a fun way to spend a weekend once all of the part numbers and everything else are posted.
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Old 07-31-2007, 11:01 PM   #12
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Quote:
Originally Posted by paraklas View Post
but you do have a rain-sensor compatible windshield right? I wonder how the sensor will look like on a plain windshield...

Because I had a cracked in my windshield, I had the auto-glass place installed a "rain sensor windshield." However, as I mentioned earlier, you DO NOT need a "rain sensor" windshield. If you managed to acquire the IR Filter/Receptor and some clear adhesive, you can install your RS or RLS on your regular windshield.
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Old 07-31-2007, 11:04 PM   #13
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http://www.autoglas-darmstadt.de/08_ensensoren.htm#BMW

Since BMW doesn't sell the adhesive or the IR Filter/Receptor individually, you need to find another way to acquire it. A yunk yard or ebay is a good source.

However, I used the above website to buy my RLS IR Filter/Receptor and the clear adhesive.

Total cost for parts and shipping/handling from Germany to USA is 25 EUROs.

I will address what part number to order on my "HOW" section.
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Old 07-31-2007, 11:05 PM   #14
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Hey Deep Blue, did you hook up that second adjustment knob on the Euro LCM to anything? If so, are you retrofitting the headlight adjustment feature as well or are you using it for something else?
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Old 07-31-2007, 11:07 PM   #15
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very nice write-up man!!
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Old 07-31-2007, 11:08 PM   #16
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Quote:
Originally Posted by TX View Post
Hey Deep Blue, did you hook up that second adjustment knob on the Euro LCM to anything? If so, are you retrofitting the headlight adjustment feature as well or are you using it for something else?

I successfully retrofitted the xenon and xenon auto-level (sorry no DIY). Therefore, the second adjustment knob is currently not being used. In Europe, the second kob is used to manually aim your halogen headlights. I will eventually use the second adjustment knob for something later in the future. I don;t know what yet though.
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Old 08-10-2007, 12:07 AM   #17
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Nice work!!!!! Subscribed
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Old 08-12-2007, 12:42 PM   #18
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Quote:
Originally Posted by Deep Blue View Post
http://www.autoglas-darmstadt.de/08_ensensoren.htm#BMW

Since BMW doesn't sell the adhesive or the IR Filter/Receptor individually, you need to find another way to acquire it. A yunk yard or ebay is a good source.

However, I used the above website to buy my RLS IR Filter/Receptor and the clear adhesive.

Total cost for parts and shipping/handling from Germany to USA is 25 EUROs.

I will address what part number to order on my "HOW" section.
when will that be?
link broken btw

Last edited by 320de46m47; 08-12-2007 at 01:22 PM.
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Old 08-12-2007, 08:47 PM   #19
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Excellent Write-up!

The European LCM is definitely worth it if you can pick one up. With regards to the rear fog lights... How come you decided to do both sides? Generally only one bulb is used to prevent confusion with brake lights.

Otherwise this is one of the better write-ups on this site.
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Old 08-19-2007, 06:48 PM   #20
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slow hand clap increasing!!!! How section ...where is it?
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