Replace the TMC module behind the cluster. It's a little silver box a little bit bigger than a *** packet with 3 connections, antenna in, antenna out and power/data.
This module translates the can messages to the cluster and adds the TMC functionality to the nav systems.
Which is why you get the message and have lost the radio/nav information in the DIS.
They can be found on ebay or places like VAG parts.
From audi they are about £200, from ebay they are around £50 upwards.
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