Good to be here.i'm john

[John ledwith]

Need help to sort problem with A150 wipe wash system.
Rear wipe wash working ok when switch on stalk is rotated,however when front wipe/wash button on stalk is pressed,neither wiper or wash will work.
Replaced pump same thing
Do I need to replace the complete stalk..tks in advance for any advicr

 

[LostKiwi]

Hi and welcome. Not able to offer much help on your problem sorry.

 

[L John]

Is the bonnet switch working correctly?
I think some wash/wipes are disabled if the bonnet is open, others will confirm or let me know if I just made it up.

 

[John ledwith]

1. Hi and welcome. Not able to offer much help on your problem sorry.

No problem thanks anyway

 

[A.J.]

Hi John, welcome to the forum, GLK may be your man when when he spots this post

 

[John Laidlaw]

Welcome John from another!
As said, GLK will be your best bet Ithink on this, he is our A class guru!

 

[LostKiwi]

I'll give @GLK a call for you

 

[Ken_R]

Not the same car but when I got mine I found I wasn't pressing the stalk hard enough! DOH!

 

[ZZZZ]

Hi John, and welcome

Despite what I might heard my knowledge of A-class is mostly superficial - some mods, and rectifying a few problems I came across personally ... Since it's a single pump for the front and rear, you were given a wrong advice to replace it, as you already know.

It does indeed sound like a wiper stalk fault. One question - do you get front washer working on second press position, when the front wipers selector is on AUTO or II or III, etc?

I take it wipers work on I II III positions, right?

It's also possible that, there's a blockage in front washer line, however that wouldn't explain wipers not working on single wipe (unless there's a feedback via SAM - I need to check wipers actuation diagram).

 

[John ledwith]

I swopped the 2 tubes on the pump black to blue.
Both front washers will work now when rear switch is actviated,so no blockage in front lines.
Wipers working on 1 11 and 11 positions.
It's appears that the pump should change direction for rear/front wash.
All actions on the stalk operates as should except the push bottom for front wipe wash where nothing happens,even by using force to push it.

 

[ZZZZ]

I just notice, I wrote "what I might heard" instead of "what you might heard" ... Freudian mistake or what?

Anyway, it does look like the stalk is at fault, in particular the push button function, as you get nothing on first stop (single wipe) and nothing on second stop (wash and a couple of wipes).

Do you even feel the first stop?

If not, that could be the best clue - I've seen a window switch, where something was definitely not right with one of the buttons - it would only go to the first stop (or the second, by-passing the first - not sure). I promptly return it for a refund, but your problem just reminded me of it: if something is broken inside the push button, it might not be touching the right contacts, etc.

If you're anywhere near Northampton, I can put your car on scanner, to see if there are any error codes, etc?

 

[LostKiwi]

I can put your car on scanner, to see if there are any error codes, etc?

Highly unlikely to be anything David. Star could probably operate the motor independent of the switch or look at the switch outputs to see if it's changing state.

 

[ZZZZ]

I think the first pressure point is the key - if it's not registering, then it's definitely the combination stalk.

I can see plenty on eBay, from under £15 to just over £100 for a brand new one.

Shouldn't take longer than half an hour to swap?

 

[John ledwith]

Thanks for all of that.
Just looked at replacement procedure for stalk.It sounds a bit like defusing a bomb.I think it needs to be in comfortable
Merc workshop with all the gear.
Long distance from Southampton. ...
In Republic of Irl.