Non-working wipers,child seat sensor, horn, srs error, fix-summary - Mercedes-Benz Forum
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post #1 of 22 (permalink) Old 02-15-2014, 01:23 PM Thread Starter
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Non-working wipers,child seat sensor, horn, srs error, fix-summary

Hello

I have spent some time this weekend fixing non-working wipers on a W203, C180. I thought i would share this experience.

The car had a SRS error on the cluster and the wipers did not work. Reading out the fault codes revealed that the child seat recognition sensor had a fault.

These cars have a sensor on one of the bonnet locks, if the bonnet is not locked or "locked" with bonnet open, then wipers and windows washing pump will not work.

In this case the windows washer pump did work when the bonnet lock was closed, but the wipers did not. There is a relay N10/1kM which gives 12v to Circuit 15R. The relay is controlled by the front SAM. The relay has 12v only when the ignition is on, but it is the SAM which decides when the relay is opened.

Circuit 15R provides 12v to several, amongst the relays N10/1kL and N10/1kQ which are the relays actuated by the SAM to control the wipers. Also 15R provides 12v to the child recognition sensor, SRS module, glove box light, cigarette plug and light, and the signal horn.

If all of these does not work probably the relay 15R (N10/1kM) have to be changed. The relay can easily be tested.

If a simultaneous error occur with both wipers and SRS involved, chances are that its relay N10/1kM (Relay 15R).

If windows washer pumps etc does not work, or if only parts of the wipers speeds works, then it is not a problem with relay 15R, (could be the column switch then)

Of course fuses have to be checked etc.

I have read quite many stories about SRS and wiper faults occuring at the same time and it is a pleasure to say that its down to relay 15 failing (and not SAM)

rgds
Oddemann
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Last edited by Oddemann; 02-15-2014 at 11:45 PM.
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post #2 of 22 (permalink) Old 02-15-2014, 03:14 PM
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Congratulations, Thanks for relating your experience here! You clearly know your way around the WIS circuit diagrams to have achieved this.

Did you investigate the relay N10/1 kM failure? Was it an open circuit coil or bad output contacts?
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post #3 of 22 (permalink) Old 02-15-2014, 11:43 PM Thread Starter
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The wire to the coil was loose on one of the connectors, we tried to solder the wire but it probably has been coated after fabric soldering. When we forced the relay closed with the hands the vipers where working and SRS error gone.

We used Star finder a lot, this tool is really good!

Oddeman
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post #4 of 22 (permalink) Old 05-09-2014, 12:41 AM
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My car has exactly the same symptoms. The technician said he had tried swapping the relay switch and that still didn't solve the issues. Can the SAM be partially malfunction?
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post #5 of 22 (permalink) Old 05-09-2014, 10:35 AM Thread Starter
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I belive the "technician" did not check the correct relay. If i remember correctly N10/1kM (Relay 15R) can not be fitted with the other relays, thats why we opened it to test it. Anyway, why did the so called technician not check if relay 15R gets voltage from the SAM ?

I dont believe the SAM is the problem. And i do not believe the technician is good enough :-)

rgds
Oddemann
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post #6 of 22 (permalink) Old 12-09-2014, 01:38 AM
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Quote:
Originally Posted by Oddemann View Post
Hello

I have spent some time this weekend fixing non-working wipers on a W203, C180. I thought i would share this experience.

The car had a SRS error on the cluster and the wipers did not work. Reading out the fault codes revealed that the child seat recognition sensor had a fault.

These cars have a sensor on one of the bonnet locks, if the bonnet is not locked or "locked" with bonnet open, then wipers and windows washing pump will not work.

In this case the windows washer pump did work when the bonnet lock was closed, but the wipers did not. There is a relay N10/1kM which gives 12v to Circuit 15R. The relay is controlled by the front SAM. The relay has 12v only when the ignition is on, but it is the SAM which decides when the relay is opened.

Circuit 15R provides 12v to several, amongst the relays N10/1kL and N10/1kQ which are the relays actuated by the SAM to control the wipers. Also 15R provides 12v to the child recognition sensor, SRS module, glove box light, cigarette plug and light, and the signal horn.

If all of these does not work probably the relay 15R (N10/1kM) have to be changed. The relay can easily be tested.

If a simultaneous error occur with both wipers and SRS involved, chances are that its relay N10/1kM (Relay 15R).

If windows washer pumps etc does not work, or if only parts of the wipers speeds works, then it is not a problem with relay 15R, (could be the column switch then)

Of course fuses have to be checked etc.

I have read quite many stories about SRS and wiper faults occuring at the same time and it is a pleasure to say that its down to relay 15 failing (and not SAM)

rgds
Oddemann
I have read the above, I have a C200 Kompressor 203 and has a peculiar habit. When you are at a high speed of over 40 KPH the horn, wipper and full light do not function, if you stop then accelerate they will work but only for a short time. Ihave not gotten the root cause of this.
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post #7 of 22 (permalink) Old 09-29-2015, 05:06 AM
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Quote:
Originally Posted by Oddemann View Post
Hello

I have spent some time this weekend fixing non-working wipers on a W203, C180. I thought i would share this experience.

The car had a SRS error on the cluster and the wipers did not work. Reading out the fault codes revealed that the child seat recognition sensor had a fault.

These cars have a sensor on one of the bonnet locks, if the bonnet is not locked or "locked" with bonnet open, then wipers and windows washing pump will not work.

In this case the windows washer pump did work when the bonnet lock was closed, but the wipers did not. There is a relay N10/1kM which gives 12v to Circuit 15R. The relay is controlled by the front SAM. The relay has 12v only when the ignition is on, but it is the SAM which decides when the relay is opened.

Circuit 15R provides 12v to several, amongst the relays N10/1kL and N10/1kQ which are the relays actuated by the SAM to control the wipers. Also 15R provides 12v to the child recognition sensor, SRS module, glove box light, cigarette plug and light, and the signal horn.

If all of these does not work probably the relay 15R (N10/1kM) have to be changed. The relay can easily be tested.

If a simultaneous error occur with both wipers and SRS involved, chances are that its relay N10/1kM (Relay 15R).

If windows washer pumps etc does not work, or if only parts of the wipers speeds works, then it is not a problem with relay 15R, (could be the column switch then)

Of course fuses have to be checked etc.

I have read quite many stories about SRS and wiper faults occuring at the same time and it is a pleasure to say that its down to relay 15 failing (and not SAM)

rgds
Oddemann
Until this morning, I had a problem whereby the horn and wipers do not work, and in addition, the SRS warning light came on. All these problems occurred at the same time. The affected car is a W203 (2001) C220 CDI.

Replacing the N10/1kM relay (as suggested by oddemann) fixed all these problems.

Thanks to Oddemann for his suggestion.
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post #8 of 22 (permalink) Old 06-09-2016, 11:53 PM
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Hello, I'm having a very similar problem that I was hopinhvto get helps with.
I have a 2004 C32 AMG. I just bought it 2 weeks ago. When I got it, the SRS light was on on the dash and the seller told me it came on a year ago and hasn't caused him any issues so he never tried to get it fixed.
Since having the car a short time, I noticed the washer fluid pump wasn't doing anything when I pushed the lever in. I don't know how long it's been out because the seller never mentioned it and it was a few days before I tried to use it but the first try wasn't working. The wiper, however WERE working. Now, all of a sudden, the wipers aren't working either.
I asked a mechanic on Just Answers and he said it's probably the clock spring since the SRS light is on. I bought one and it just came in the mail today. I know how to replace it but before doing so, I wanted to do a little more investigation and then I came across this thread. Now, I don't k ow wheather I should try to replace it or just change the relay 15.
Is that what you fine folks would recommend first? That I change the relay before tackling the clock spring job?

Thanks in advance for any help I get.

Shawn
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post #9 of 22 (permalink) Old 06-10-2016, 06:32 PM
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I would not replace any SRS parts without a proper diagnosis, meaning pulling codes. In order to do that, you need a scanner that reads MBZ's proprietary systems. A generic OBDII scanner won't do that. Of course the dealer's SDS system will, and a less expensive option is iCarsoft i980.

As for tis problem, the clockspring would have nothing to do with the wipers as the combination switch sits behind that. The clockspring just manages the items on the steering wheel - horn, airbag and radio/menu buttons.

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post #10 of 22 (permalink) Old 06-10-2016, 06:36 PM
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I see. So what should I do to fix the wipers issue? Should I try replacing the relays, or the control switch?
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