martes, 26 de abril de 2011

Hacking VW CAN-Comfort Bus II


Following my experiments of our previous post, we have a new achievement!!

I´ve continued sniffing the confort can bus of my car (VW Golf IV). Now I know how to read the remote key button state. If we add this new discovery to the control of the windows......

It´s an implementation to roll the windows up/down with the remote keys. Now I can decide the sequence which I want to use. I´ve decided a long press is the most suitable.

The comfort bus is very small (not too many messages) and it´s very straight to decode messages.
The difficulty has been to discover how to wake up the devices when the car is locked/unlocked with the remote. There is one message which contains only 1 byte and it changes the value depending of the key´s state (no key, key inserted, key inserted and in the ignition position).
I´ve tried to send this message (key in the ignition position) and voilá!!! The devices have started to send messages and the most important thing, they have answered to my request to roll up/down.

I'll keep updated the new achievements!!

5 comentarios:

Anónimo dijo...

thanks for the great webpage!

Miguel Ángel Casanova dijo...

It's amazing!

Anónimo dijo...

Which message ID is in charge of waking up?

Unknown dijo...

hello dear friend i have b5.5 3bg passat i need this project please help me i dont control my windows to key help me

Unknown dijo...

This is similar to a project I am working on. I am trying to get the CCM and HVAC to function outside the vehicle. Have you identified the "Keep Alive" message and/or the module that transmits that message?

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