This must be correct for US. Mat did not mention where he comes from.
The latest MBs with MHI are straightforward, just plug in the MB puck to the
MHI connector. I'm afraid there is no MHI kit on a '99 car though.
US has BT support also for earlier MB car kits, not sure what is in a 99 CLK
from factory (but it needs to have a factory car kit to start with,
otherwise it will be more costly and not all dealers would run the
In Europe (other areas with same equipment) you would have to have the UHI
kit, no BT for older kits.
See e.g. www.mbenznl.com or http://www.whnet.com/4x4/phones.html for more
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