Turn signal indicators don't make clicking noise? - Mercedes-Benz Forum

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Old 12-19-2011, 09:49 PM   #1 (permalink)
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Turn signal indicators don't make clicking noise?

I just bought a 2001 ml55 and I noticed that when using my turn signals, they operate just fine but they don't make the clicking noise. What could be wrong with it? I find myself forgetting they're on sometimes.
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Old 12-28-2011, 01:39 PM   #2 (permalink)
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Anyone? Is it the cluster that makes that noise or is it a separate unit?
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Old 12-28-2011, 01:50 PM   #3 (permalink)
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Clicky-click thing is inside instrument cluster. Is your seat belt buzzer working? How about lights on buzzer?
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Old 12-28-2011, 01:53 PM   #4 (permalink)
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Actually now that you mention it, lights on buzzer and seat belt chime never go off. How would I fix this?
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Old 12-28-2011, 01:56 PM   #5 (permalink)
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Somebody killed sound thingy to mask other problem. Pull instrument cluster take it apart and see what was severed.
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Old 12-28-2011, 02:02 PM   #6 (permalink)
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Any idea what I'm looking for?
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Old 12-28-2011, 07:55 PM   #7 (permalink)
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PBC buzzers may have different shapes. They have small slots or hole for sound to get out. Here is sample. Buzzers - PCB Mount

Dive into this project only if you are comfortable with printed circuit board work. Once you open instrument cluster you are on your own.
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Old 12-29-2011, 08:33 PM   #8 (permalink)
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Actually just checked my buzzer by turning on the headlights without the key and the buzzer does in fact work. So now I just have to figure out if the turn signal "clicker" is actually located in the cluster itself. I know some other cars use a relay that makes that sound. Is it the same as the w163 or is it as simple as a simple device that makes that sound?
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Old 12-29-2011, 10:27 PM   #9 (permalink)
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ML uses two separate relays for left and right turn signals. They are in the fuse box under the hood. Too far away to be audible. Clicker is positively inside the cluster.
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Old 12-29-2011, 10:37 PM   #10 (permalink)
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Circuit diagram

Here is the part of the cluster circuit that has the indicator lights and clicker. It looks a bit like a relay but you can't tell exactly from the diagram. This clicker is isolated by a diode from each of the left and right input signals but it is the same device that makes the noise from either side. As it is unlikely that both diodes have gone open circuit and because the indicator lights in the cluster work, the clicker itself must be faulty. If you can find the device on the circuit board in the cluster, it might have a part number on it (if you are lucky).
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