Date registered: Oct 2007
Vehicle: 1990 190D, 1997 S300 Turbo Diesel, 2002 ML270 CDI
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Quoted: 2 Post(s)
Non-working wipers,child seat sensor, horn, srs error, fix-summary
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)
Last edited by Oddemann; 02-15-2014 at 11:45 PM.