Retrofit data removed from WIS last offline version
 

The last offline version of WIS/ASRA, version 3.17.13.2 no longer has the retrofit data for the W221. This means retrofits like iPod interface wiring harness(az82.60-p-0001-01sx), Media interface(an82.60-p-0016sx), etc, are no longer documented. I'm not sure of the version of WIS where this started happening but I do know the documentation does exist in version 3.8.10.1. My thinking is that Mercedes is pulling this information thinking that it is no longer relevant, which makes sense. This is just a heads up so that if you're attempting to purchase a "version" of WIS/ASRA for your car, you will have an idea of what version to look for.

That's not totally correct------you did not install the delta disk

It's correct if you don't have a delta disk and if you're using a "boot leg" you may not have access to the "delta".