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Discussion Starter #1
We have a recent issue with the infotainment issue in the Touareg. Everything works except for the media button. When the media button is pressed it hangs on the loading screen. When the car is started the CD player module in the glove box makes a clicking noise for a few seconds and then stops. I've done quite a bit of web searching but haven't come up with anything. I'm wondering if this could be as simple as a loose connection somewhere, but I can't even figure out how to get access to the disk drive mechanism.

If anyone has come across this before or has advice on troubleshooting, please let me know. I tried posting on TDIclub, but got no responses. Here is the data from the VCDS scan.

Address 5F: Information Electr. (J794) Labels:. 4E0-035-6xx-5F.clb
Part No SW: 7P6 035 664 D HW: 7P6 035 664 A
Component: H-BN-NA H40 0706
Revision: -------- Serial number: 273EU0DB001561
Coding: 020200050040E1EF41022B0E00000003F00001030000000000
Shop #: WSC 31414 790 00001
VCID: 39792F99B0F66882DA-806C

Subsystem 1 - Part No SW: 7P6 919 603 C HW: 7P6 919 603 C
Component: DU8 SV Touch H26 0045
Serial number: VWZ8Z9M7900L72

Subsystem 2 - Part No SW: 7P6 919 603 C HW: 7P6 919 603 C
Component: DU8 SV Touch H26 0045
Serial number: VWZ8Z9M7900L72

2 Faults Found:
00658 - Control Head
012 - Electrical Fault in Circuit - Intermittent
Freeze Frame:
Fault Status: 00101100
Fault Priority: 5
Fault Frequency: 1
Reset counter: 160
Time Indication: 15

Freeze Frame:
Voltage: 14.30 V
Bin. Bits: 100

02446 - Disk Drive Mechanical Malfunction
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 5
Fault Frequency: 1
Reset counter: 118
Mileage: 237118 km
Time Indication: 0
Date: 2019.03.02
Time: 16:54:29

Freeze Frame:
Voltage: 14.10 V
ON Time: 5158 h
 

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Discussion Starter #2
If anyone has general trouble shooting tips or even a link to other threads that would talk about installing the RNS850 so that I can pull enough trim apart to check all of the connections then I'd appreciate it. I'm hoping that it could be a loose connection between the unit in the glove box and the head unit. But otherwise I'm assuming that I'll be better off spending $$ on a new used unit rather than trying to have the dealership investigate it.
 

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Discussion Starter #3
Well, I made up some homemade credit card radio tools and pulled the "brain" out of the glovebox. All connections appeared to be snug. The unit is getting power as evidenced by all of the clicking, but I have no idea how to go about troubleshooting it. Unfortuatnely, I'm not sure what to do other than replace it. The VW part number appears to be 7P6 035 644 D. It looks like $1300-1500 part so I'm going to have to try to track down a used one. VW appears to call it a "control unit" but its an odd part that seems difficult to find on car-part.com. I tried searching for it but came up empty.



I have a few questions. Has anyone replaced this unit before? Does it have/need a radio code? Does the revision matter? For example I found one with a date of mfr of 2009 on ebay so it was out of a T2 rather than T3. But I don't know if there are any differences or if I could just update to the latest firmware and be good.


What other troubleshooting would be recommended for my situation? To summarize the issue again, the radio and satellite radio work fine. The media button and nav button don't do anything. Essentially it just hangs on a loading screen.
 

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Sorry about your troubles. I dont have any advice other than to say I also have a HDD issue involving Nav Database that no one seems to have an answer for, if that is any consolation. I feel we are on a island with these cars...VW gives little care, just so long as they get their money. And the rest of us are left to figure out things by foraging these forums for clues and an occasional answer.
 

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Discussion Starter #5
Thanks for the reply. I'm sure that VW would be happy to help me by throwing parts at the problem for $$$. I am tempted to start a new thread to ask a different question to see if I can get any help. At this point I don't know what options I have other than to try replacing parts and it looks like the module that I'm questioning is about $300-500 used.



I'll try here first:



1) Has anyone had an issue where the media and NAV stopped working?



2) If so did replacing the Control Unit in the glove box fix the problem (and/or what did)?


3) Is there any difference between the revisions of the modules (i.e. do I need to replace my "D" with a "D" or can I go older)?


4) Is there any need for VAGCOM coding or a VW radio code to swap that module and does anyone know of instructions anywhere for this procedure?
 

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I assume you have tried to reset and clear the codes but the problem still exists?
If so, i would look at replacing them and see how it goes.
If it requires adaptation then that would be small issue to overcome.
Try and source the parts from a wrecker
 
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