Thanks for the help. I was worried it would be something like this.

I have an 87 300d and I disconnected the negative battery terminal when bleeding my brakes recently. Now I have the dashed line also. Is this just because I disconnected my battery cable? It was working fine before I did so. If I can expect this every time I disconnect my battery for some bit of maintenance, I am definitely getting rid of this radio. Any ideas what a dealer might charge to reset the radio with that special tool? I suppose they reset it while in the car and with the battery hooked up or it would just go to dashed lines again. I don't suppose anyone has the tool for rent?

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87 300D 162,000 miles: It's not just a car, it's an adventure!

Someone should try reverse-engineering what the tool does. hmmmmm.
Yeah the radio stays in place, they remove the face plate only. The tool is a small electrical box with a red and green button on it. It has a bunch of small connectors that plug into the same connector the radio face plate uses. There is an instruction sheet that tells you what to do after it's plugged in. The small electrical box "tool" is really small. I'm sure it just shorts together certain pins, depending on what button is pushed. There are I think only 2 variations to what button is pushed and when.
The radio can be repaired so the dashed lines don't show up immediately if the battery is disconnected or drained, there is a small capacitor or battery which can be replaced.
Gilly

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Does anyone know of a place I can send my becker radio to for replacement of the battery/capacitor so it doesn't code as soon as the battery is disconnected? There must be someone who services these things I can mail it to for service. The silence in my car is becoming maddening.

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87 300D 162,000 miles: It's not just a car, it's an adventure!