w203 combination switch - no water

jobela · 31-05-2008, 05:40 PM

Hello, all.

I was hoping I could get some help from you masters...

The combination switch doesn't switch on the water for the windshield. She's a 2003 c200cdi estate, elegance level. I have removed the pumps (2) plugs on the water tank, switched them, and made the rear window button actuate the windshield pump. Now, I know the rear system is a relay-based one. But the windshield is an electronic, non-relay based. The electronics of it come from the multiple function control module nr. 1. So, what would be most likely to have gone? The combination switch or the electronic module? Is anyway we can check it or reprogram it via the engineering mode at the command 2.0 panel?

TIA

Diesel Benz · 31-05-2008, 06:13 PM

The combination switch likely. No way to diagnose the front SAM or the combi switch via Comand. Star could do it.

jobela · 31-05-2008, 06:15 PM

Thanks for your reply.

Any special care in removing the switch?

kjay · 31-05-2008, 06:24 PM

This might sound daft, but are you pressing the switch far enough. For the wash function, you have to push it in 'beyond' the first spring action until it clicks.
Just a thought.

jobela · 31-05-2008, 06:39 PM

Hmmm, doesn't seem to have a second barrier...
Will try and let you know, thanks

jobela · 01-06-2008, 07:47 PM

Nope...
Looks like something is gone, pushed it all the way to no avail...

whitenemesis · 01-06-2008, 08:29 PM

A kjay says, one must press past the first resistance, hold and then one may have to wait quite a few seconds before water starts, especially if the system hasn't been used in a while.

Or if it's been dismantled!!

Dec · 01-06-2008, 09:34 PM

Have you considered opening the stalk to investigate, the pictures are of a W202 stalk, might be useful?

jobela · 03-06-2008, 06:37 PM

Ok. I have pushed the stalk over the two barriers; I have switched the 2 pump plugs on the water tank so that the windshield pump would work with the rear comand, and it did.
Now how do I remove/dismantle the stalk switch? I'm cautious and afraid because of the airbag...

Dec · 03-06-2008, 07:26 PM

Was the link in my last post any use to you? The pictures are for a W202, yours may be similar and likely to work in much the same way.
The stalk is a combination switch, the lower part is a lever switch and the upper part is for wipers so it is the upper part that you need to dismantle, there is no need to involve the steering wheel/airbag.

Dec

jobela · 04-06-2008, 08:55 PM

Thanks dec. But I'm concerned I may damage the switch when I try to dismantle it... Can you post exactly how to dismantle it?

Dec · 04-06-2008, 10:01 PM

Jobela, could you come over to the bottom of this thread (page 2) here...Intermittent wiper comes on when not in position

Dec

jobela · 05-06-2008, 12:18 AM

Tks, DEC, that is very well explained. I will give it a go and let you know(my English is not so good...)

jobela · 05-06-2008, 10:42 PM

Ok so I dismantled only half of the switch and I can say it is quite different
http://www.mbclub.co.uk/forums/attac...1&d=1212702039

http://www.mbclub.co.uk/forums/attac...1&d=1212702039

The black thingy is a cursor which is supposed to be actuated when you press it for water. I am really afraid of going further...

Remeber this is for W203

Dec · 06-06-2008, 08:55 AM

I would not go any further than that unless I was definitely going to replace the stalk, if there is a fault inside the mechanism, it is unlikely that it would be repairable.

You are left with two choices, replace the Stalk or replace the Combination Relay.
In the link below, one man solved his problem by replacing the Relay while the other solved it by replacing the Stalk, it’s a 50/50 chance of getting it right. You could go to a dealer first, to have it diagnosed.
http://www.mercedesshop.com/shopforu...%2Fwiper+issue
Dec

31-05-2008, 05:40 PM	#1
jobela Hardcore MB Enthusiast Join Date: Sep 2007 Posts: 109	w203 combination switch - no water Hello, all. I was hoping I could get some help from you masters... The combination switch doesn't switch on the water for the windshield. She's a 2003 c200cdi estate, elegance level. I have removed the pumps (2) plugs on the water tank, switched them, and made the rear window button actuate the windshield pump. Now, I know the rear system is a relay-based one. But the windshield is an electronic, non-relay based. The electronics of it come from the multiple function control module nr. 1. So, what would be most likely to have gone? The combination switch or the electronic module? Is anyway we can check it or reprogram it via the engineering mode at the command 2.0 panel? TIA

01-06-2008, 08:29 PM	#7
whitenemesis Hardcore MB Enthusiast Join Date: May 2007 Posts: 4,660	A kjay says, one must press past the first resistance, hold and then one may have to wait quite a few seconds before water starts, especially if the system hasn't been used in a while. Or if it's been dismantled!! Last edited by whitenemesis; 01-06-2008 at 11:24 PM.

31-05-2008, 06:13 PM	#2
Diesel Benz Hardcore MB Enthusiast Join Date: Feb 2006 Location: Europe Car: 221.122 & 212.025 & 204.089 Posts: 2,957	The combination switch likely. No way to diagnose the front SAM or the combi switch via Comand. Star could do it.

31-05-2008, 06:15 PM	#3
jobela Hardcore MB Enthusiast Threadstarter Join Date: Sep 2007 Posts: 109	Thanks for your reply. Any special care in removing the switch?

31-05-2008, 06:24 PM	#4
kjay Hardcore MB Enthusiast Join Date: Aug 2007 Location: buxton, derbyshire Car: C200k Coupe 2003 Posts: 1,028	This might sound daft, but are you pressing the switch far enough. For the wash function, you have to push it in 'beyond' the first spring action until it clicks. Just a thought.

31-05-2008, 06:39 PM	#5
jobela Hardcore MB Enthusiast Threadstarter Join Date: Sep 2007 Posts: 109	Hmmm, doesn't seem to have a second barrier... Will try and let you know, thanks

01-06-2008, 07:47 PM	#6
jobela Hardcore MB Enthusiast Threadstarter Join Date: Sep 2007 Posts: 109	Nope... Looks like something is gone, pushed it all the way to no avail...

01-06-2008, 09:34 PM	#8
Dec Hardcore MB Enthusiast Join Date: Jul 2004 Car: C180,A. December '94 84k Posts: 873	Have you considered opening the stalk to investigate, the pictures are of a W202 stalk, might be useful?

03-06-2008, 06:37 PM	#9
jobela Hardcore MB Enthusiast Threadstarter Join Date: Sep 2007 Posts: 109	Ok. I have pushed the stalk over the two barriers; I have switched the 2 pump plugs on the water tank so that the windshield pump would work with the rear comand, and it did. Now how do I remove/dismantle the stalk switch? I'm cautious and afraid because of the airbag...

03-06-2008, 07:26 PM	#10
Dec Hardcore MB Enthusiast Join Date: Jul 2004 Car: C180,A. December '94 84k Posts: 873	Was the link in my last post any use to you? The pictures are for a W202, yours may be similar and likely to work in much the same way. The stalk is a combination switch, the lower part is a lever switch and the upper part is for wipers so it is the upper part that you need to dismantle, there is no need to involve the steering wheel/airbag. Dec

04-06-2008, 08:55 PM	#11
jobela Hardcore MB Enthusiast Threadstarter Join Date: Sep 2007 Posts: 109	Thanks dec. But I'm concerned I may damage the switch when I try to dismantle it... Can you post exactly how to dismantle it?

04-06-2008, 10:01 PM	#12
Dec Hardcore MB Enthusiast Join Date: Jul 2004 Car: C180,A. December '94 84k Posts: 873	Jobela, could you come over to the bottom of this thread (page 2) here...Intermittent wiper comes on when not in position Dec

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05-06-2008, 12:18 AM	#13
jobela Hardcore MB Enthusiast Threadstarter Join Date: Sep 2007 Posts: 109	Tks, DEC, that is very well explained. I will give it a go and let you know(my English is not so good...)

06-06-2008, 08:55 AM	#15
Dec Hardcore MB Enthusiast Join Date: Jul 2004 Car: C180,A. December '94 84k Posts: 873	I would not go any further than that unless I was definitely going to replace the stalk, if there is a fault inside the mechanism, it is unlikely that it would be repairable. You are left with two choices, replace the Stalk or replace the Combination Relay. In the link below, one man solved his problem by replacing the Relay while the other solved it by replacing the Stalk, it’s a 50/50 chance of getting it right. You could go to a dealer first, to have it diagnosed. http://www.mercedesshop.com/shopforu...%2Fwiper+issue Dec