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Dan
Dan, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 1694
Experience:  Auto Technician
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On my 1999 sl500 auto window drop stopped working

Customer Question

on my 1999 sl500 auto window drop stopped working
Submitted: 1 year ago.
Category: Mercedes
Expert:  Dan replied 1 year ago.

Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.

Expert:  Dan replied 1 year ago.

1997 Mercedes-Benz SL500 5.0L Eng

Component

power windows

Normalizing Power Windows

  1. Completely close each window with manual switch. Hold switch in closed position for .3 second.
  2. Repeat procedure for each power window.
Expert:  Dan replied 1 year ago.

Please reply to this if you need more help and we can continue this conversation. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. If I am not giving you 5 star service, please let me know what I missed.

Thanks,

Dan

Customer: replied 1 year ago.
I have already tried that. Car is 1999. also tried disconnecting neg battery terminal
Customer: replied 1 year ago.
drivers side works fine
Expert:  Dan replied 1 year ago.

Replace the window switch. It sounds like this is your problem.

Customer: replied 1 year ago.
window goes up and down fine
Expert:  Dan replied 1 year ago.

Its the same for 1999.

I

Customer: replied 1 year ago.
Even though window goes up and down fine your saying window switch needs replacing??
Expert:  Dan replied 1 year ago.

You can test the switch if you have a multimeter set to measure resistance.

Customer: replied 1 year ago.
why is window going up and down fine is switch is bad?
Expert:  Dan replied 1 year ago.

There is a separate part of the switch for the auto feature.

Customer: replied 1 year ago.
when I said auto I meant window does not drop a little bit when door is opened and does not go up automatically when door is closed, If I hold switch window it does go down all the way
Expert:  Dan replied 1 year ago.

In that case, check the door switch for that door. The module may not be seeing the door open or closed. Also check the wires in the door jam, there is a rubber boot with wires inside. This is a common place to find broken wires that could be causing your problem.

Customer: replied 1 year ago.
I believe door switch is working because when I open the door interior light goes on
Expert:  Dan replied 1 year ago.

Check all fuses and look for broken wires in the door bellows boot.

Customer: replied 1 year ago.
there is a separate fuse for the auto drop and raise window?
Expert:  Dan replied 1 year ago.

No, but this is a basic step that should not be overlooked.

You need a dealer type scan tool to diagnose, I wonder if you have any codes in the body control module.

Customer: replied 1 year ago.
I guess I have to bring it to the dealer?
Expert:  Dan replied 1 year ago.

They have the diagnostic tools to get the job done.

Customer: replied 1 year ago.
Oh boy. now big money
Expert:  Dan replied 1 year ago.

There are a lot of European techs that start their own shops, if you can find someone in your location who specialized in European cars. They maybe less expensive.

Customer: replied 1 year ago.
ok will try
Expert:  Dan replied 1 year ago.

Ok