[tonyTouareg2020]

Hello,

I recently bought a 2005 R5 Tdi Touareg. It works fine, but cluster instrument screen didn't have constrat and is not readable during sunny days. So I decided to replace it.
Bought a brand new screen on ebay from a german professional seller:

Swaping the monochrome red screen was easy, but when reconnect cluster I heard a strange noise : "clack", followed by a "hard reboot"...
Put back the orginal screen in cluster instrument but message "system error, bring car to workshop", with other errors about brakes and sensors (oil level, temp...) appear.
I heard the engine bay fans starting when I turn the key.
Engine can start.

I used VCDS for a diag :

Address 17: Instruments Labels: 7L6-920-xxx-7LA.lbl Control Module Part Number: 7L6 920 870 S Component and/or Version: KOMBIINSTRUMENT RB8 2035 Software Coding: 0007111 Work Shop Code: WSC 05600 995 194851 VCID: 4683E31F32A7E4B671-515B 9 Faults Found: 00562 - Sensor for Oil Level/Temperature (G266) 010 - Open or Short to Plus 01314 - Engine Control Module 004 - No Signal/Communication 01316 - ABS Control Module 004 - No Signal/Communication 01321 - Control Module for Airbags (J234) 004 - No Signal/Communication 02053 - Control Module for Transfer Case (J646) 004 - No Signal/Communication 02751 - Control Module for Cornering Lights and Headlight Range (J745) 004 - No Signal/Communication 01336 - Company Data Bus for Comfort System 004 - No Signal/Communication 01304 - Radio 004 - No Signal/Communication - Intermittent 01305 - Databus for Infotainment 004 - No Signal/Communication

Other controllers are not accessible for diag.
Voltage is more displayed by the gauge.

I'm trying to check all the fuse, but at this point I didn't find any broken.

Your help / idea will be appreciated

 

[jeffnhiscars]

You may have triggered all those codes when you did the swap. I'd clear them and see if they return.

 

[tonyTouareg2020]

Thanks for your reply
I will try, but I suppose it will not solve all issues, like battery voltage gauge that is more working. Radio is also not starting.
My feeling is : a fuse or relay burned. Otherwise cluster instrument is broken.

But I don't how to check it... Testing relay is not simple in my mind, and that's the same for cluster instrument :/

 

[jeffnhiscars]

Since the issue began when you changed the screen it's reasonable to assume you left something disconnected. I did this repair on my former 05 and there are all kinds of things to be careful with.

 

[tonyTouareg2020]

Issue sloved ! I try with another cluster instrument and my Touareg come back to life. Conclusion: swap of little lcd red screen probably break or flash electronic component. After that it was not able to cummunicate with any ecu.