VW Golf VI VDO cluster repair

**cd_contact** · 24th November, 2021, 09:58 AM

Hello ,

I have a car that came in with a dead cluster : no lights , no communication , IMMO active . Checked power supply & wiring to cluster , all is ok . On closer inspection the cluster has been removed before and it has been opened (probably to adjust mileage) . The owner insists the cluster died when the battery drained out . I suspect a corrupt dump . Can somebody check the 24LC32 dump to see if it's ok or not ?

The part number is 5K0920870C , SW0029 , HW H21 . The car is 2009 2.0l diesel DSG. ump from 24LC32 attached , thank you.

**H2Deetoo** · 24th November, 2021, 11:34 AM

Dump looks OK, so I think the problem is related to the cluster hardware.

**rafal** · 24th November, 2021, 11:49 AM

try resolder whole pcb by hot gun.............

**cd_contact** · 24th November, 2021, 12:31 PM

I already tried reheating the board - no luck . If I get a used part with same HW and SW and get the dump from it - can I make a good dump from the 2 (original and "new") ?

Thank you.

**H2Deetoo** · 24th November, 2021, 03:09 PM

No, the immo data is uniquely encrypted inside the eeprom so a simply eeprom swap will not work.
You can try to swap both the NEC and the 24C32 eeprom from orig dead cluster to the donor, if the NEC is not damaged it should work. At least if communications is working you could read full immo data.

You can also try and get partial immo from the engine ecu and write it to donor cluster. Then adapt new keys and that should be sufficient.
What engine ecu partnr is used? Do you have tools to read ecu eeprom?

Rgs H2Deetoo

**Smart66** · 24th November, 2021, 03:42 PM

E2P looks good, mileage is 294 144 km. Did you check cluster's DTCs using VCDS?
@H2Deetoo
How is possible to read NEC flash from this cluster?

**H2Deetoo** · 24th November, 2021, 03:53 PM

@Smart66 the TS said there wasn't any comms.

Normally the NEC is locked so reading flash is not possible.
You can only read flash if the cluster is communicating and you can unlock it.

When I said swapping NEC I really meant swapping the NEC chip.
This often works, at least to make a donor cluster working to be able to read it then.

**Smart66** · 24th November, 2021, 04:03 PM

It isn't possible to clone cluster without messing with NEC flash? Chip desoldering is really complicated

Where are keys stored in cluster? Only in NEC?

**H2Deetoo** · 24th November, 2021, 04:18 PM

Immo data is stored encrypted in eeprom and the key for that is in the NEC flash.
In this case, when no comms is possible, swapping NEC is good option. If you have some skills with soldering then it isn't a big problem.

**cd_contact** · 24th November, 2021, 04:26 PM

Originally Posted by H2Deetoo

Immo data is stored encrypted in eeprom and the key for that is in the NEC flash.
In this case, when no comms is possible, swapping NEC is good option. If you have some skills with soldering then it isn't a big problem.

I found a used cluster and when I receive it I will try swapping both the EEPROM and the NEC . In case the board itself (from the original cluster) is faulty this should work . If the NEC is faulty then I will try to read EDC17 EEPROM and come back to you.

Feedback as sson as I have the "new" cluster. Thanks

**Smart66** · 24th November, 2021, 04:40 PM

Are part numbers same from these two clusters?

**H2Deetoo** · 24th November, 2021, 05:05 PM

Cluster partnumbers don't matter.
If both cluster have the same NEC cpu (70F3426 f.e.) then you can swap them and you should be able to get communications again.