RDS-TMC connection: RDS-TMC connection is faulty
Re: RDS-TMC connection: RDS-TMC connection is faulty
Malcolm are you on RNS-D or E?
______________________________________________________
C7 A6 allroad 3.0TDi.
Tiguan 2.0TDi R-line
C7 A6 allroad 3.0TDi.
Tiguan 2.0TDi R-line
Re: RDS-TMC connection: RDS-TMC connection is faulty
No TMC module with RNS-E. 
I would temporarily wire the TCM directly to the dashpod (J285) to eliminate a wiring fault. Use twisted pair if possible.
Is there anyone close to you that would be willing to try one of your "new" TMC modules in their car?
I would temporarily wire the TCM directly to the dashpod (J285) to eliminate a wiring fault. Use twisted pair if possible.
Is there anyone close to you that would be willing to try one of your "new" TMC modules in their car?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RDS-TMC connection: RDS-TMC connection is faulty
So I tried some wire tracing but then just lived with pressing the Return button three times every time the dreaded “RDS-TMC connection: RDS-TMC connection is faulty” message came up.
However I really would like to fix this now once and for all. I think I’m a the limit of my knowledge and probably need someone else to look at it. But who? It’s not the kinda thing I’d give to your Audi dealer as they’d just replace components on a trial and error basis and at huge cost.
So what all have I tried… Any clues in here?
I did some continuity tests on the CAN H and CAN L wires from radio, through RDS-TMC unit to dash. CAN H (high?) was fine but CAN L (low then?) showed nothing. But I didn’t do anything further about that as I’m sure I read somewhere that CAN L isn’t used. Or did I dream that?!
You’ll recall I bought two TMC units from breakers on eBay that didn’t resolve the problem. Well then I got a chance to try a third unit that was in a car and known to be working. It still showed the error message though. So I’ve ruled out the physical RDS-TMC unit then(?).
I then started to get a problem when I’d get in the car in the morning and the radio would ask for the safe code. This would be pretty random but did seem to be more prevalent if I left the car for a longer period of time or if I left the radio on and switched the ignition off rather than switching off the radio then the ignition. It also happened more frequently after having not used the car over a weekend for example. However that theory was disproved recently when it happened after I’d gone into pay my fuel after filling up! I initially thought this could only happen through a power interruption so I’m struggling to see how this is happening.
Now this may be a complete red herring but one morning I came out and the battery was flat and I had to start the car with jump leads. In 6 years of ownership this is the first time this has happened. Alternator is charging and I’m getting a decent 13.8v from the battery under charge.
I did read somewhere that the battery can be flattened by the radio continually looking for the TMC unit when it’s not present. But why has this happened only once since my RDS-TMC problem started?
I then got the chance to try another RNS-D unit in the car. It still gave the “RDS-TMC connection: RDS-TMC connection is faulty” message and was fine for a few days until it too asked for the safe code one morning! WTF!
I also read that it is possible to configure the RNS-D unit not to look for an RDS-TMC unit. By changing the Adaption code 10 under the Nav Module 37 block in VCDS I thought I could configure the unit out. I’m afraid I don’t know how my code is derived but I changed mine one up and then one down but that didn’t make any difference. I still get the error when the RNS-D is turned on.
All suggestions gratefully received!
However I really would like to fix this now once and for all. I think I’m a the limit of my knowledge and probably need someone else to look at it. But who? It’s not the kinda thing I’d give to your Audi dealer as they’d just replace components on a trial and error basis and at huge cost.
So what all have I tried… Any clues in here?
I did some continuity tests on the CAN H and CAN L wires from radio, through RDS-TMC unit to dash. CAN H (high?) was fine but CAN L (low then?) showed nothing. But I didn’t do anything further about that as I’m sure I read somewhere that CAN L isn’t used. Or did I dream that?!
You’ll recall I bought two TMC units from breakers on eBay that didn’t resolve the problem. Well then I got a chance to try a third unit that was in a car and known to be working. It still showed the error message though. So I’ve ruled out the physical RDS-TMC unit then(?).
I then started to get a problem when I’d get in the car in the morning and the radio would ask for the safe code. This would be pretty random but did seem to be more prevalent if I left the car for a longer period of time or if I left the radio on and switched the ignition off rather than switching off the radio then the ignition. It also happened more frequently after having not used the car over a weekend for example. However that theory was disproved recently when it happened after I’d gone into pay my fuel after filling up! I initially thought this could only happen through a power interruption so I’m struggling to see how this is happening.
Now this may be a complete red herring but one morning I came out and the battery was flat and I had to start the car with jump leads. In 6 years of ownership this is the first time this has happened. Alternator is charging and I’m getting a decent 13.8v from the battery under charge.
I did read somewhere that the battery can be flattened by the radio continually looking for the TMC unit when it’s not present. But why has this happened only once since my RDS-TMC problem started?
I then got the chance to try another RNS-D unit in the car. It still gave the “RDS-TMC connection: RDS-TMC connection is faulty” message and was fine for a few days until it too asked for the safe code one morning! WTF!
I also read that it is possible to configure the RNS-D unit not to look for an RDS-TMC unit. By changing the Adaption code 10 under the Nav Module 37 block in VCDS I thought I could configure the unit out. I’m afraid I don’t know how my code is derived but I changed mine one up and then one down but that didn’t make any difference. I still get the error when the RNS-D is turned on.
All suggestions gratefully received!
Re: RDS-TMC connection: RDS-TMC connection is faulty
Wow, talk about elimination.
The SAFE thing is bizarrre. Makes me wonder about a short circuit somewhere.
I think the TMC module is coded out not with the Vagcom but from the engineering menu on the RNS-D itself. There's some info in the FAQ but I think the screenshots have gone to the big photo bucket in the sky.
If you disconnect the TMC module from the RNS-D, do you still get the SAFE message coming up?
The SAFE thing is bizarrre. Makes me wonder about a short circuit somewhere.
I think the TMC module is coded out not with the Vagcom but from the engineering menu on the RNS-D itself. There's some info in the FAQ but I think the screenshots have gone to the big photo bucket in the sky.
If you disconnect the TMC module from the RNS-D, do you still get the SAFE message coming up?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RDS-TMC connection: RDS-TMC connection is faulty
I took the TMC module out this morning. The thing is I can go for a few hours or a few days without it going into SAFE mode. I'll report back when it does. Or I might never!
Re: RDS-TMC connection: RDS-TMC connection is faulty
Just to pick this fault up again...
Even with the RDS-TMC unit disconnected I was still being asked for the the SAFE code every morning. Eventually though it wouldn't even allow me to enter the SAFE code.
I read a forum post elsewhere that suggested that if there wasn't a constant 12v to the RNS-D unit SAFE pin you wouldn't be allowed to enter the SAFE code. I measured mine and there was less than 1v showing so I ran a new cable from the fuse box with 12v and the problem of continuously prompting me for the SAFE code has gone away. Why this ever happened though I don't know...
Anyway after being contacted by PM by another forum member with exactly the same problem I decided to try re-wiring the CAN bus from RNS-D to instrument cluster. Maybe if the power supply cable had failed others could have too. To cut a long story short I tried replacing the two wires from RNS-D to RDS-TDC; the two wires from RDS-TDC to Instrument cluster both individually and together and even by-passed the RDS-TMC unit by wiring the RNS-D CAN connections direct to the instrument cluster. I still have the same problem.
However I have more serious and immediate problem. The car will not start after putting everything back together - or it starts and then cuts out after a second.
Whilst the instrument cluster was out I did not have the key in the ignition and only turned on the radio to test that. From what I've read elsewhere the immobilizer has kicked in. Correct?
I've disconnected the battery just now and will try again shortly but is that all i need to do to resent everything??
Even with the RDS-TMC unit disconnected I was still being asked for the the SAFE code every morning. Eventually though it wouldn't even allow me to enter the SAFE code.
I read a forum post elsewhere that suggested that if there wasn't a constant 12v to the RNS-D unit SAFE pin you wouldn't be allowed to enter the SAFE code. I measured mine and there was less than 1v showing so I ran a new cable from the fuse box with 12v and the problem of continuously prompting me for the SAFE code has gone away. Why this ever happened though I don't know...
Anyway after being contacted by PM by another forum member with exactly the same problem I decided to try re-wiring the CAN bus from RNS-D to instrument cluster. Maybe if the power supply cable had failed others could have too. To cut a long story short I tried replacing the two wires from RNS-D to RDS-TDC; the two wires from RDS-TDC to Instrument cluster both individually and together and even by-passed the RDS-TMC unit by wiring the RNS-D CAN connections direct to the instrument cluster. I still have the same problem.
However I have more serious and immediate problem. The car will not start after putting everything back together - or it starts and then cuts out after a second.
Whilst the instrument cluster was out I did not have the key in the ignition and only turned on the radio to test that. From what I've read elsewhere the immobilizer has kicked in. Correct?
I've disconnected the battery just now and will try again shortly but is that all i need to do to resent everything??
Re: RDS-TMC connection: RDS-TMC connection is faulty
The RNS-D can't communicate directly with the car via CAN, that's why it uses the TMC module, aka CAN gateway.
I can't believe that you did any damage. Have you now disconnected the CAN wiring you put in place?
Does sound like immobiliser. But if the CAN network is borked then the instrument cluster can't tell the ECU it's OK to run the engine.
You might have blown a fuse somewhere. Maybe check number 32?
I can't believe that you did any damage. Have you now disconnected the CAN wiring you put in place?
Does sound like immobiliser. But if the CAN network is borked then the instrument cluster can't tell the ECU it's OK to run the engine.
You might have blown a fuse somewhere. Maybe check number 32?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RDS-TMC connection: RDS-TMC connection is faulty
Panic over.
Checked the fuses nothing blown. All the temp wiring had been removed so the only thing I could think of was I'd maybe bent a pin putting the 3 connectors back in the Instrument Cluster. Took it all back out, no sign of anything. Put it all back. Ran a scan on Vagcom cleared all the codes. Fired it up. All fine. Phew.
So back to my "RDS-TMC connection is faulty" message... My suspicion is it is the IC but that's not a simple swap to eliminate is it? It's linked to the key? Correct? Maybe I'll just live with it.
I note Martin68 has gone down the replace the RNS-D route but I'm not sure that would work for me - might eliminate the RDS-TDC message but wouldn't restore the DIS display would it?
Checked the fuses nothing blown. All the temp wiring had been removed so the only thing I could think of was I'd maybe bent a pin putting the 3 connectors back in the Instrument Cluster. Took it all back out, no sign of anything. Put it all back. Ran a scan on Vagcom cleared all the codes. Fired it up. All fine. Phew.
So back to my "RDS-TMC connection is faulty" message... My suspicion is it is the IC but that's not a simple swap to eliminate is it? It's linked to the key? Correct? Maybe I'll just live with it.
I note Martin68 has gone down the replace the RNS-D route but I'm not sure that would work for me - might eliminate the RDS-TDC message but wouldn't restore the DIS display would it?
Re: RDS-TMC connection: RDS-TMC connection is faulty
When you clear the codes, do they come back? The ones you posted earlier are showing intermittent which could be from troubleshooting.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RDS-TMC connection: RDS-TMC connection is faulty
MalcolmSu wrote:A quick scan with VCDS-lite tonight threw up the following codes - not sure which are relevant or which to focus on...
-------------------------------------------------------------------------------
Address 17: Instruments Labels: 4B0-920-xxx-17.LBL
Controller: 4B0 920 983 B
Component: KOMBI+WEGFAHRS. VDO D15
Coding: 01484
Shop #: <--you should remove all of this from your post
VCID: <--you should remove all of this from your post
WUAZZZ4B34N <--you should remove all of this from your post
2 Faults Found:
01300 - Control Module for Navigation with CD-Rom (J401)
49-00 - No Communications
01304 - Radio
49-00 - No Communications
What value have you got in adaptation channel 62 of the instrument cluster?
/also, what does measuring block 140 of instrument cluster show?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RDS-TMC connection: RDS-TMC connection is faulty
thanks for the heads up on the log data - now removed.
>>When you clear the codes, do they come back?
Yes
>>What value have you got in adaptation channel 62 of the instrument cluster?
it shows 5 - which i guess is correct 1 plus 4 for radio and navigation?
>>what does measuring block 140 of instrument cluster show?
it shows Radio : Radio 0; Telephone : Blank; Navigation : Navigation 0 and Telematics : Blank
>>When you clear the codes, do they come back?
Yes
>>What value have you got in adaptation channel 62 of the instrument cluster?
it shows 5 - which i guess is correct 1 plus 4 for radio and navigation?
>>what does measuring block 140 of instrument cluster show?
it shows Radio : Radio 0; Telephone : Blank; Navigation : Navigation 0 and Telematics : Blank
Re: RDS-TMC connection: RDS-TMC connection is faulty
I would have expected a "1" to be displayed in the first block. Weird.
5 in channel 62 sounds right if you have the 3 spoke wheel.
You could try programming 5 back into channel 62. Maybe your adaptation got screwed up.
5 in channel 62 sounds right if you have the 3 spoke wheel.
You could try programming 5 back into channel 62. Maybe your adaptation got screwed up.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RDS-TMC connection: RDS-TMC connection is faulty
Another thought... the TV tuner talks to the TMC module (I think). Could you lay your hands on a different tuner to try with? Or at least disconnect yours to see if that makes any difference. Might give us a clue.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: RDS-TMC connection: RDS-TMC connection is faulty
So I tried re-writing the value of Adaption 62 - I changed and saved it to 4, tried the RNS-d then changed and saved it back to 5 - still the same error.
I pulled the cables (just the main multi-connector) from the back of the TV unit in the boot and TV disappeared as an option from the RNS-d but unfortunately still the same RDS-TMC error.
Can I fling a couple of other facts into the mix which maybe I should have mentioned before but I didn't think were relevant or connected. Firstly a long time ago I replaced the GPS receiver after it had failed. Secondly and I myself thought I'd eliminated this through swapping out the whole RNS-d unit with another. When I get the RDS-TMC error I get very poor radio reception. No matter where I am with the engine off radio reception is non-existent. At home when i start the engine it improves slightly but then as I drive closer to Glasgow it improves to the point where it's perfect (except when i go though a tunnel;). However when i stop in Glasgow - an area of good radio reception - and switch off the engine radio reception disappears. Where is the radio receiver itself - in the the RSN-d itself?
I didn't mention before as I didn't think the RDS-TDC unit had anything to do with radio reception(?)
I'm wondering if the radio reception is power related (as opposed to aerial )? Remember also that i resolved my SAFE code problem by running another 12v supply to the RNS-D.
Not sure if any of that helps or just muddies the waters?
I pulled the cables (just the main multi-connector) from the back of the TV unit in the boot and TV disappeared as an option from the RNS-d but unfortunately still the same RDS-TMC error.
Can I fling a couple of other facts into the mix which maybe I should have mentioned before but I didn't think were relevant or connected. Firstly a long time ago I replaced the GPS receiver after it had failed. Secondly and I myself thought I'd eliminated this through swapping out the whole RNS-d unit with another. When I get the RDS-TMC error I get very poor radio reception. No matter where I am with the engine off radio reception is non-existent. At home when i start the engine it improves slightly but then as I drive closer to Glasgow it improves to the point where it's perfect (except when i go though a tunnel;). However when i stop in Glasgow - an area of good radio reception - and switch off the engine radio reception disappears. Where is the radio receiver itself - in the the RSN-d itself?
I didn't mention before as I didn't think the RDS-TDC unit had anything to do with radio reception(?)
I'm wondering if the radio reception is power related (as opposed to aerial
)? Remember also that i resolved my SAFE code problem by running another 12v supply to the RNS-D.Not sure if any of that helps or just muddies the waters?
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