I wasjust hoping you might find something that could explain the bad behaviour.

Of course there may well not be anything visibly broken.

A bad solder joint might be seen, maybe with magnification. 

PM me anything showing the circuit board, if you get in there for a look, please. 🙂

Please note - I am not a mechanic or expert in anything.

 

On 07/01/2023 at 18:23, lello7 said:

I can not attach any more pictures in this therad 😞

If it is a site issue Freedom membership might resolve that. - https://www.briskoda.net/forums/subscriptions/

 

Edited 9 January, 20233 yr by nta16

Update

I now have a new unit, but have not had the time to test it. I need to program it first (among others the radio code is stored there?)

Is it only possible with vcds or is there an cheaper option? I will have to rent regardless, but n vcds near me available. 

Mean while, I disconnect the battery and bring the Bcm with mee inside if I leave the car outside for a longer period of time. 

 

The bcm bord looked flawless under 10x microscope magnifying. 

I did resolder all pins 73a and 73b, and all relays... Same problem. 

This is a multilayered PCB, so I guess its a internal crack or bad connection between the layers. 

 

Any sugestions. I have all diagram for the car, but the actual relay is not presented. Only the connections going to and from it, j519 unit. 

 

 

The BCM change fixed the problem. Thank you all!