Mike H Cheshire
Active Member
When I switch on the intermittent wipe the wiper goes through one cycle and then stops and does not budge unless I move the control to setting 1 or 2 or press the wiper control in lightly ie not hard enough to send a jet of water onto the screen.
On setting 1 and 2 the wipers work normally and when the car comes to a stop the wipers stop. They restart as soon as I move off so in the main they are working fine all apart from the intermittent function.
The car was fitted with a new body control unit just before I bought it 2 years ago. I have been told that the intermittent wipe function may not have been “switched on” and that it possibly needs diagnostic equipment connecting and being “told” to work?
Does that sound feasible?
I did see on a USA Mercedes Forum that someone raised the same issue and the fix was as follows
"First, pull and reseat your windshield wiper relays (locations are on the fuse diagram usually found in the toolcompartment in your spare tire well).
With engine running and all passenger doors closed, starting at 0 turn on wipers to #3 position, then put the switch in the 0 position then put it in the auto #1 (rain sensor position) then have someone splash water on the windshield as the doors have to be closed to reset this function. Then they should function normally.
Anyone heard of this and if so can you tell me where the wiper relay is located ?
Finally when its working properly is the intermittent cycle rain sensitive and does it speed up the wipers depending on the amount of rainfall?
Thanks
On setting 1 and 2 the wipers work normally and when the car comes to a stop the wipers stop. They restart as soon as I move off so in the main they are working fine all apart from the intermittent function.
The car was fitted with a new body control unit just before I bought it 2 years ago. I have been told that the intermittent wipe function may not have been “switched on” and that it possibly needs diagnostic equipment connecting and being “told” to work?
Does that sound feasible?
I did see on a USA Mercedes Forum that someone raised the same issue and the fix was as follows
"First, pull and reseat your windshield wiper relays (locations are on the fuse diagram usually found in the toolcompartment in your spare tire well).
With engine running and all passenger doors closed, starting at 0 turn on wipers to #3 position, then put the switch in the 0 position then put it in the auto #1 (rain sensor position) then have someone splash water on the windshield as the doors have to be closed to reset this function. Then they should function normally.
Anyone heard of this and if so can you tell me where the wiper relay is located ?
Finally when its working properly is the intermittent cycle rain sensitive and does it speed up the wipers depending on the amount of rainfall?
Thanks