w203 combination switch - no water
Thread Starter
Newbie
Joined: Sep 2007
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Station c200CDi - 2003
w203 combination switch - no water
Hello, all.
I was hoping I could 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 command 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
I was hoping I could 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 command 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
MBWorld Fanatic!
Joined: May 2003
Posts: 4,005
Likes: 106
From: Houston, TX
2015 E250D
you cannot test it by jumping it since it's not a hardwired switch. It's CAN controlled and sends it's signals to the front SAM unit via CAN. If you are not getting any power at the pump, then check fuse first. Then you will need to test switch and or front sam unit with a star diagnose system.
MBWorld Fanatic!
Joined: Jan 2005
Posts: 2,848
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From: Orange County
2005 C Wagon (No snickering please!)
I agree with Sunil's analysis, but I am not sure there is a fuse to be checked. Many circuits controlled by the front SAM measure the current flowing in the circuit, and switch off the power if excessive current is detected. A fuse to protect the wiring would be redundant in this case. Mercedes fuse charts report "electronic" for the windscreen washer pump.
Thread Starter
Newbie
Joined: Sep 2007
Posts: 11
Likes: 0
Station c200CDi - 2003
Yes. There is indeed a fuse F46 on the engine bay, for all of the controller. If this fuse had gone, none of the functions would be available, but the only thing missing is the washer. I believe the controller can malfunction by loosing one or more of its functions, but I guess I'll have to dismantle the trim/steeringwheel/other to check the switch...
