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Old 01-07-2020, 04:26 PM
HGV HGV is offline
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W124 1995 E320 Wagon Mysterious Switch

I was installing a headlight switch last night and all went very well. I was looking under the dash i noticed a knob that i have never seen before. It is only accessible when the the lower bolster is loosened as i did to remove the headlight switch. The previous owner of the car did some weird things so i am not sure if this is an original feature. (he removed the kick down switch,????Why would anyone do that?)

Any help in figuring this out would be appreciated. I didn't touch it, but i might to see if it does anything


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W124 1995 E320 Wagon Mysterious Switch-w124-switch-dash.jpg  
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Old 01-07-2020, 05:12 PM
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That appears to be a cruise control amplifier. The knob is a lock/unlock.

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Old 01-07-2020, 10:59 PM
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Diagnostic module. The knob is to engage / release it from the connector.

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Old 01-08-2020, 04:10 AM
HGV HGV is offline
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I am interested on the purpose for an inaccessible switch. When is it used? Why isn't it readily accessible?
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Old 01-08-2020, 10:19 AM
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It isn't a switch. It's a latch. Turning it one way releases the module and pushes it out of its socket, turning it the other way pulls it into the socket and latches it in place.
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Old 01-08-2020, 01:00 PM
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FWIW, the DM's only function is to monitor smog-related stuff and turn on the CEL if there's a problem.....

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