Golf 5: Passat Engine Swap & Parking Brake Sim

Hello,

I installed a Passat engine with the MKB: BWS code, including a DSG LTX transmission, into my Golf 5. Everything is running perfectly and reliably. I also retrofitted the ABS system from a Golf VI (MK60 to MK60EC) manufactured by ATE.
However, I'm encountering an error in the engine control unit and the DSG (dual-clutch transmission) indicating that the electric parking brake is missing. The Passat uses an ABS system from TRW.
Is there a way to simulate the parking brake in such a way that it appears to be installed and functioning correctly?

Greetings, Alex.

Is my idea not good, or why isn't anyone responding to me ?

Hello,

Do the corresponding warning lights illuminate in the cockpit? If not, I personally would find the effort too high just to clear the error memory.
Or simply find suitable control units from a Golf; then you don't have to tinker around.

Best regards, Rainer.

Can you not remove the parking brake code?

'No, unfortunately, that's not possible. The error messages in the MSG and transmission indicate that the parking brake is not detected. The Passat has an electric parking brake.'
I now also have a CAN sniffer. Even though my car runs perfectly with the error message, I want to gain some experience with it. Now I need a log from a Passat that is stationary and has the EPB (Electronic Parking Brake) open. I would like to inject this information into mine. Maybe someone here in the forum has that configuration .

Greetings, Alex.

Hello.

To what extent are you capable?
I could just send you a few lines of code right now, but you want to learn something, right?

On what hardware platform do you want to run the emulation?
You need something that executes the code for you, or for the car.

I currently don't have full access to my data because I am working on a Monday.
But logically, the information about the parking brake is included in the braking message, and that message has a checksum.

This will become a bit more technically complex, as you'll need to disconnect the CAN lines from the brake control unit and insert a small gateway device in between.
You intercept the signals from the brake system, manipulate them for the parking brake, and then retransmit them on the other side.
And with each transmission, a checksum and a 'keep-alive' counter must also be calculated.

If you don't have a Christmas tree in the cockpit, I would heed Rainer's suggestion: Screw it!

As far as I recall, the parking brake is located at address 0x5C0 within the powertrain CAN bus.
The message is 8 bytes long and fully occupied.
You need to handle 64 bits, maintain a keep-alive counter, and calculate a checksum.
And that happens every 20 milliseconds in the drive system.
My tip: Just let it go!

Felix.

The electromechanical parking brake has its own control unit. Therefore, it's more about simulating a complete ECU rather than modifying an existing CAN message.

Greetings.
Jens.

Edit: I just saw that the corresponding control unit is connected to a "sub-CAN bus" of the ABS control unit (in the VW Passat 3C).
Regarding the Golf 5K, where the ABS control unit is located, I haven't found anything related to an electromechanical parking brake. Therefore, I probably need to revise my statement .

Surfjenser wrote:

I just saw that the corresponding control unit is connected to a "sub-CAN bus" of the ABS control unit (in the Volkswagen Passat 3C).

Unfortunately, I don't have any documentation on that, but the x5C0 is normally defined in the CAN matrix for drive control. That means if you haven't seen the x5C0 appearing on your data bus yet, you should be able to simply add it.

Best regards, Ingo.