Mine continues to charge when the engine is off.

Any problems with draining the battery dead?

I remove the phone. I highly doubt it would drain it though.

I have searched around and found the steps, but maybe I am doing sometihng wrong to enable aux. I have the CDR-220 and I am trying to enable aux. I have tried holding the TP button for ~10 seconds but the radio goes into a scan mode. I have not been able to get the "Becker 1" menu up. Any tips?

Any luck? I just followed the steps and it worked. I'm away from home right now so I can't take a look right now. The cord is plugged in securely right?

Duh. My fault. I don't have my cord yet- I was just curious to see if this unit had the ability to do it before I ordered one. I guess I will order one and find out!

"cord" is not needed in order to program the aux mode on the CDR220.

Here is a pdf document with instructions for the CDR220 and others:
Turn radio "ON"
2. Press and hold the "TP" button for about 8 seconds until Becker 1 is
displayed.
3. Turn the Tuning Knob until AUX OFF is displayed.
4. Press either button located directly under the Arrows on the display to
change the present setting from OFF to ON.
5. Turn radio OFF.
6. Turn Radio back “ON” Press “CD” button to enter AUX Mode.

If you are not able to do this now or anytime in the future, simply disconnect the radio power plug or battery for a little while, reconnect and try again.



http://www.discountcarstereo.com/pdf/ip-bkr.pdf