No radio display in instrument cluster
 

Hello all, I am french so sorry if my english is not perfect!

I have an Audi S8 from 08/1999 with RNS-C. I have replaced it by a RNS-D with TMC box.
I searched for many months for an used TMC box to keep radio, cd and navigation display in the instrument cluster.
I found on ebay a TMC box and I mounted it this week-end.
After recoding the RNS-D and the instrument cluster, navitagion display work fine but there is no Radio and CD display in the instrument cluster. Also I lost TV :(

Someone could help me?

Many thanks!!

Welcome to the forum Buelldozer (great name). Some will be around soon with an answer for you.

Hi Conan!

It was a long time I wanted to come on this forum but always something to do...
But now I decided to take the time! +++

I had the same problem with not having Radio / Cd displaying in the DIS when I did the upgrade. No matter what settings I tried, I dont think I ever got it to work....

But, your TV should be able to work.

The TV tuner needs its canbus connection connecting directly to the back of the head unit to work. If the canbus isnt there, the Nav wont see the tuner and the TV option wont be there.

So, you have probably taken the canbus from the back of the instrument cluster into the TMC, then from the TMC into the pin 13 and 26 on the Head unit ?

In which case, the original canbus wires for the TV tuner are now no longer connected to the headunit ?

On a UK car, remove the passenger side transmission tunnel cover and you will reveal a square multiblock connector, which is part of a chunky wire that runs from the headunit all the way directly to the back of the car for the CD changer, aerial, Phone, Nav etc. Im sorry, I dont know exactly how this will be on a French car...

This loom is continuous from the back of the car all the way to the front. The multiblock is used to transfer signals into the audio loom that it needs, eg reverse signal, ABS pulse and canbus. Power comes from the boot fuse panel.

If you find this connector, and disconnect the 2 canbus wires from the main car loom(wires same colour as the ones you removed from the connector original) and then make a connection from your new pins 13 and 26 to these wires that run to the rear where the TV tuner is, then your TV should work again. I'm not 100% sure that you need to disconnect the wires from the main loom, but I think it cant be good to have old and new canbus protocols talking on the same twisted pair.

Sorry this is all english, and might be hard to understand. I tried to make it easy but failed!

Ian

Yes, I disconnected rear original canbus to connect canbus from. Can I connect both TMC and original canbus together?

Im not sure.... it might work, but it might just get confused..

It shouldnt hurt anything to try, and if it doesnt work, then you just need to cut the two canbus wires that connect the audio loom to the main loom where that connector block is.... +++

Sorry for the late, I didn't have time to test it.
I also have another question : is it possible to activate the safety belt light in the instrument cluster?

When I test it with vagcom it's ok but if I drive without the safety belt it doesn't light on.

A little off topic, but I have to agree with Conan - great name, having owned a couple of lightnings, and never having got off of one without a grin on my face!

+++ Mine is XB 12R, I have since 5 years, and 5 years of pleasure!