Update....nothing out of the ordinary. The dealership offered to upgrade the system with a discount at $800. It's not worth it for us, so we'll just rely on the old cell phone system.

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....just drive'em!
'89 300TE White w/Blue, 152K SOLD!
'93 300E Blue w/Tan, 154K SOLD!
'01 E-320 4-Matic wagon, 130K
'67 Vette Conv. White w/Blue, 217,421K

Not much of a discount. The DTA control module lists for $600, and there's not much to the installation.