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Discussion Starter · #1 ·
Hi all. Had a long, fruitless search through the posts for a definitive answer to my query before asking other members. I'm hoping I can get some specific advice or pointers to make the issue as easy as possible.

My airscarf switch for the drivers side has 3 led lights that show when the button is pushed, but then go out after a few seconds. Reading a post from Seanhump it mentions that a 3 led that then goes out, without flashing, indicates nothing coming back from the seat. I'm assuming that the airscarf is a pretty rudimental bit of kit, with few parts, so not too difficult to point to any common problems, others have had.
I can't do it, but I'd like to give an auto electrician a guide as to how to narrow possible problems down. For example, is it easier to remove the seat? Is it a coincidence that the drivers bottom heated seat element is also not working? is there anyone who has had, and solved, the same problem?

Any and all help is appreciated.....
Ian
 

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The heated seat element is a common issue in our cars and shockingly most of the MB lineup from the early 2000s up until 2012. There was a stickied thread on this issue in the R171 General Discussion on this topic in the past, not sure where it has gone. Use the search feature, should be easy to find.

In regards to the airscarf, seeing as all the components live in the back of the seat you need to remove the seat itself to work on it effectively. Removing the seat itself is not hard, and neither is exposing the components, diagnosing the exact faulty part may be an issue though. Since you plan to hand it over to an automotive electrician and in the scheme of things the airscarf system is *relatively* simple(ish) once the seat is out it should not take too long to diagnose the faulty part.

Worse case scenario is that you may need to take it to someone with DAS and see if it is a control module issue... but hopefully that will not be necessary if it is just a faulty part.
 

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Hi all. Had a long, fruitless search through the posts for a definitive answer to my query before asking other members. I'm hoping I can get some specific advice or pointers to make the issue as easy as possible.

My airscarf switch for the drivers side has 3 led lights that show when the button is pushed, but then go out after a few seconds. Reading a post from Seanhump it mentions that a 3 led that then goes out, without flashing, indicates nothing coming back from the seat. I'm assuming that the airscarf is a pretty rudimental bit of kit, with few parts, so not too difficult to point to any common problems, others have had.
I can't do it, but I'd like to give an auto electrician a guide as to how to narrow possible problems down. For example, is it easier to remove the seat? Is it a coincidence that the drivers bottom heated seat element is also not working? is there anyone who has had, and solved, the same problem?

Any and all help is appreciated.....
Ian
Under your driver's seat (accessable from the front) there is a black electrical connector which has four wires - two are for the airscarf heater, two are for the airscarf fan motor. If you know how to use a multimeter you can test the continuity through the heater then the motor, and compare to your passenger seat. I'm betting that either the heater or the motor are open circuit and thus need to be replaced.

If you are interested in tackling this I can upload the wiring diagram and instruct you on what to test. I can also upload the instructions on how to remove the airscarf unit if you want to do this. It's very easy, but I don't know your competency level.

Whatever you do, do not disconnect the yellow connector under the seat as this will trigger an SRS warning light on your instrument cluster.
 

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...and the airscarf blowers are accessable WITHOUT removing the seats - the rear covers can be removed (they are only held on with 4 torx screws - T20 I think).
The thread mentioned shows how to remove the seat backs

The control unit is on the rear firewall, at floor level under the carpet behind the drivers seat, if you want to check the connections - again, the thread shows where it is
 

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Discussion Starter · #5 ·
thank you all, for your help.

RJV, I would like the wiring diagram and instructions please, it would be a big help. Happy to receive via here or my personal email.

Seanhump, the seat back removal seems easy enough, so does the switch testing, thanks to the original post.

Akonion, do you suggest DAS first, or the continuity testing?

Ian
 

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thank you all, for your help.

RJV, I would like the wiring diagram and instructions please, it would be a big help. Happy to receive via here or my personal email.

Seanhump, the seat back removal seems easy enough, so does the switch testing, thanks to the original post.

Akonion, do you suggest DAS first, or the continuity testing?

Ian
OK, here are the instructions to remove the seat back and the wiring diagram for airscarf (and seat heater pads).

On the wiring diagram locate M4/11 and you will see the fan motor and heater element in your right seat. Locate X55/4 which is the black connector under your right seat. Look at the wiring above X55/4. The brown wire and red wire connect to the fan motor and the blue wire and green wire connect to your heater element. Unplug the male side of the connector (which come up through a hole in the carpet from the female side of the connector (which is clipped to the under seat frame) and with a multimeter test the continuity across the fan motor and then the heater element by probing the female side of the connector. Make a note of the resistance in both, and then compare these to the readings on the left seat.

On the faulty (right) seat I'm expecting that either the fan motor or heater element is "open circuit" (i.e. infinite resistance). My bet is that the heater element (blue to green wires) is open circuit.
 

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Before you start doing nasty things, do something simple (5 min. job).
When the Airscarf is used intensively for prolonged periods of time, the wiring may simply overheat. As a result, it MAY be the case that the feeding plug has melted (resulting in a short circuit).

In my car, this appeared to be the case. I did not realise until I had read a posting on a German SLK forum.
The solution? Instead of swapping the super expensive Airscarf unit, all it cost me was some EUR3.50 for a new plastic plug housing. :)
Part no. is A0465458228.

The plug feeds underneath the seat, and you do not even have to take out the seat (I only put it into its highest position, and as much to the rear as possible).
Below is a pic of the melted plug housing.

Arjen.
 

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Discussion Starter · #8 ·
thanks again.
Wiring info and seat back removal instructions, duly nnoted and saved.

Arjen, I have heard about the melting plug before too.
Was the melted plug coming from the car loom, or was it in the seat loom?
How were you able to cut, then reattach, the new plug without removing the seat?
I'll be giving this a go asap and fingers crossed...

Ian
 

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The melting plug is on the feeding wire (hence, the car loom). On my LHD car, it is the plug located on the outer side, bottom of the seat (front side).
See some of the below photos.
If you have the memory seats (like I do) then you will see three plugs. The black one on the below photo, next to the yellow one for the airbag, and another separate black one for the memory seats.

The first below photo shows the plug when still mounted.
In the second one I took out the Airscarf wiring plug (clicked into the larger one). In my case, all I had to do was putting something thin into it (flat blade screwdriver, or tie wrap) to loosen the pins.
Next, I bought the new small plug housing, of which the third photo shows the opposite side of what you see in photo 2.

Really, it is a 5 min. job to check and (if needed) repair this.

Arjen.
 

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Ian, many thanks for your kind words :), and yes... you are totally right... most Brits now have something else to worry about than a malfunctioning Airscarf... particularly those living in the North/North-West... :(

Wishing you all some better weather... please share your "Eureka!" moment with us...

Arjen.
 

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Discussion Starter · #12 ·
Eureka!!!! :laugh:

Plug was making a short circuit after melting!!
Thankyou Arjen.
From the back of the plug, all looked ok.
After disconnecting it, it was easy to see that the centre part of the plug had melted, allowing the shorting.
New plug on order, but lets hope its acted as an RCB and nothing else is fried.

Just one more thing Arjen, how do you get the offending plug out of the loom?
I thought it would just click out, but not so.

Ian
 

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Did I hear somebody screaming "Eureka" from the other side of the Channel?! :):D
Super nice, Ian! :tu:

If I remember correctly, the smaller plug housing (that you will have to replace) can be taken out from the larger plug by inserting two super thin blade screw drivers. Once you have the new plug housing in your hands, you will see where they hold/click into the larger one.
So, from the "melted side" so to speak (i.e., the side where you see the two metal connectors making contact/short circuit) you insert the thin flat blade screwdrivers, and then gently pull out from the other side.

Arjen.
 

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Poor design fault though, for such a heavy electrical load....
Yes, but I once learned that this only occurs if you frequently use the Airscarf at its highest position, for prolonged periods of time (and I believe also with the seat in a very low position, allowing very little air to circulate at the seat's bottom end).

Anyway, now that you know the bug, and also know it will hardly cost you anything to repair it... I would say: "Live with it" and rather enjoy the hot air in your neck pretty soon.

Would this stupid plug housing be the culprit indeed, then I happily await my digital beer:Beer:... ;)

Arjen.
 

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Thanks Arjen,

This was the same problem for me too on an E350. However, not only did the plastic housing melt in the front seat, but also after the fuse box in the trunk. So if anyone has an issue where the Airscarf on both sides stops working, check the trunk for a short as well.

Does the A0465458228 part you referenced include both the male and female parts of the connector, or just the male?
 

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Thanks Arjen,

This was the same problem for me too on an E350. However, not only did the plastic housing melt in the front seat, but also after the fuse box in the trunk. So if anyone has an issue where the Airscarf on both sides stops working, check the trunk for a short as well.

Does the A0465458228 part you referenced include both the male and female parts of the connector, or just the male?
FYI Arjen has not been on since: Last Activity: 01-28-2017

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