Windshield wipers not working properly

KAPUKU2001

MEMBER
2006 MERCEDES BENZ C230
V6
2WD
AUTOMATIC
146,000 MILES

My windshield wipers only work when I press on it to wash the windshield and even then the liquid doesn't come out. I've changed the fuse but no change, I'm not sure what else to do since I live in Houston and it rains often.

Thursday, July 8th, 2021 AT 12:19 PM

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

This could be a number of things but the likely issue on your vehicle is a front SAM module issue. The reason is there is a circuit board on the SAM module that controls each of these functions.

The way to confirm this is we need a scan tool capable of monitoring the SAM so that we can see if the switch input is being recognized by the SAM. If it sees no switch input then the switch could be the issue but I suspect you will have the switch input and that means we need to check and make sure there is no voltage coming out of the SAM. If not then the SAM is the issue.

Here is a guide that helps use a test light that will help with checking this power:

https://youtu.be/Hlna_kUt7As

Below you will find the wiring diagram that will help with testing this voltage.

Please run through this material and let us know what questions you have. Thanks

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