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The B tuner uses Bosch can communications protocol and that is incompatible with the RNS-E which wants infotainment can. Thats is why there is a TMC unit in older cars with RNS-D. It converts Bosch Can bus to infotainment can bus to talk to the cluster.

Thats why stateside cars with RNS-D still have a TMC/can gateway even though TMC is not available. They use the can gateway bit.

Craig
 
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