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What usually happens is the Ipod kit that is installed in the vehicle the connection adapter at the back of the radio has poor contact and causes this issue here.Mercedes has a bulletin on this type of fault here to replace the Ipod connection kit with a new factory replacement.This will occur if the Ipod kit was installed with the vehicle when built or added in after.The connection at the back of the radio/command unit needs checked to see if it has poor connection and then the Ipod conversion harness needs replaced with the updated harness usually to correct this issue here which can be obtained at a dealer to replace it.This connection is the main connection for the radio/head unit that affects the steering controls in some cases as well as all operations of the radio.
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The radio itself will need removed.This involves removing the center vents above the radio using special tools then the screws can be removed to remove the radio.Once removed the connection/adapter harness can be replaced.The special tools are below.
I know usually at a dealer this can run around an hours labor to have done plus the cost of the harness itself.