I have a cruise control that does absolutely nothing. I pulled out the amp and checked resistance on the coding plug and every resistor is open. Every PIN combo tests open?

So I ordered a new Coding plug. But that makes mewonder what blew the "plug" out?

Any ideas what takes the plug out?

Here's an excerpt from "another parts dealer" about the amplifier replacement:

This unit is the Mercedes replacement unit for numerous older versions. Will require appropriate Mercedes coding part for proper function and may require slight wiring modification on some models per Mercedes TSB. Most failures are found in the coding part not the amplifier, we cannot accept amplifier return for warranty without corresponding proof of purchase of new coding part from Mercedes. 1 per car.

That's the only place I've heard about the coding plug being a big problem. Elsewhere it seems that the Amp is a bigger culprit? I'm going to check the other parts, just thought maybe someone would say "X" makes the coding Plug Blow.

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<<Les Garten>> 1988 300TE 280,000 Miles