How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Billy Your Own Question

Billy, Trainer/ Master Technician
Category: Mercedes
Satisfied Customers: 3498
Experience:  Trainer 8+ years, master tech. 10+ years, SAE member
Type Your Mercedes Question Here...
Billy is online now

Hi There, I have a 55 reg 350 SL some times my wipers do not

Customer Question

Hi There, I have a 55 reg 350 SL some times my wipers do not work at the same time
I get the air bag light flashing on/off on the speedo and glove box and the roll bar indicator
flashing on/off and clicking behind the seats ( like a relay operating on/off )
Submitted: 3 years ago.
Category: Mercedes
Expert:  Shantal-Mod replied 3 years ago.


I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.

I wonder whether you're ok with continuing to wait for an answer. If you are, please let me know and I will continue my search. If not, feel free to let me know and I will cancel this question for you.

Thank you,


Customer: replied 3 years ago.

OK to wait

Expert:  Billy replied 3 years ago.
Hello and Welcome! I'm Billy and i will assist you with this. Feel free to ask if further info is needed.

My apologies for the delay, thank you for your patience.

First, you need to try to extend the roll bar mechanically (manually), as it seems to be stuck causing the clicking and the warning lights (it does make the airbag light flicker as well, however other faults could exist). Here is the detailed procedure:
click here for details

This is not an easy task, read the instructions carefully, and proceed if you are sure you can handle this. This should take care of the warning lights, and if they stay on, then you need to hook on to a MB scan tool, to retrieve the fault codes, which should point out the faulty component or circuit to be checked accordingly.

As for the wipers, they have a motor and linkages. One of the linkages (or the teeth on the blade) are either loose or worn, causing the wipers to be out of synch. You need to remove the black plastic cover under the windshield in the engine compartment, to gain access to the linkages, and check which one is loose, or worn, and replace accordingly.
Thank you for your trust! Get back to me if you need more info...Thank you in advance for the positive rating...
Regards, Billy
Customer: replied 3 years ago.

Hi There,

Thanks for that, the wipers operate perfect and are not out

of synch

The only time the wipers will not work is when the SRS light and roll bar

light are on the speedo stationary or driving

As for the clicking relay on the roll bar this happened whilst driving

so will check that area.

Warning lights off wipers work perfect, lights on wipers do not work

Expert:  Billy replied 3 years ago.

In this case, i would start by checking the ground points (ground connections), in engien bay, under dash (in foot wells), and check the connectors under the front seats.
Get back to me with your results.

What Customers are Saying:

  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, do indeed know your stuff. Jim
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex

Meet The Experts:

  • Matt


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
< Last | Next >
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Marty's Avatar


    ASE Certified Technician

    Satisfied Customers:

    Bosch Certified Master Technician with over 35 years experience in the automotive industry.
  • mike_a_mechanic's Avatar


    Mercedes Mechanic

    Satisfied Customers:

    17 years experience as a auto mechanic, foreign and domestic.5 years running my own repair business.
  • MB Paul's Avatar

    MB Paul

    Mercedes Technician

    Satisfied Customers:

    Mercedes Benz Qualified Diagnostic Technician
  • Greg's Avatar



    Satisfied Customers:

    Automotive diagnostic tech
  • Ross's Avatar


    Diagnostic and repair technician

    Satisfied Customers:

    Licensed diagnostic and repair technician