PDC sensors

Hello,
I would like to intercept the data from the distance sensors in my 2009 Passat via the CAN bus.
I've already managed to access the Quadlock connector on the radio.

Can someone tell me which messages on the CAN bus I should be listening to, and how to interpret the values related to the distance?

Hello!

That message should be 54B.

Byte 1: Distance from the top-left corner.
Byte 2: Distance from the top right.
Byte 3: Distance from the rear, left side.
Byte 4: Distance to the rear right.
Byte 5: Front distance, center, left.
Byte 6: Front spacing, center, right.
Byte 7: Distance from the rear center, left side.
Byte 8: Distance from the rear center to the right.

Unit: 0...254cm with a resolution of 1cm.
The message arrives every 100 milliseconds.

Regards,
Maxx.

Wow,
'Thank you, Maxx.'

I'll try it out tonight.

Good luck, and let us know .

'With 'tonight,' I was a bit too optimistic...'

I'm still working on my CAN Bus interface, and I'll definitely let you know as soon as everything is up and running.

Best regards,

I'm already curious to see if it fits.
I don't currently have a CAN connection installed, so I can't test it.

And has anything come out of it yet?

Hello everyone,

I'm reviving this thread because I have the same question, but it's about an Audi A6 4F.

I would like to read the distances of the PDC sensors. However, I am not receiving messages with the ID 0x54b.

Does anyone know which ID this refers to for the Audi A6/4F?
I would also like to know what message is displayed on the bus to indicate that the parking assist system is currently active. For example, when I put the car in reverse or press the PDC button, the visual display appears on the MMI, even if all eight distances are still showing as 255. Is there a separate message for this?

Thank you very much!

Regards,
Stefan.

I'm answering part of my own question.

In the Audi A6 4F, the parking distance sensor (PDC) distances appear to be transmitted via the message 0x6a5.
There are always alternating messages:

06a5: 138.135, 1.255.255.255.255, 0
06a5: 202,134, 1,255,255,255, 0

In this case, the message with the value 138.135 is intended for the rear sensors, while the message with the value 202.134 is intended for the front sensors. The bytes with the value 255 represent the distances, and presumably in the order: left, left-middle, right-middle, right.

Before the parking assist system was activated, or after it was activated, the following messages appeared:

06a5: 138.136, 1, 1, 0, 0, 0, 0
06a5: 202,136, 1, 5, 0, 0, 0, 0

06a5: 138.136, 1, 4, 0, 0, 0, 0
06a5: 202,136, 1, 0, 0, 0, 0, 0


If anyone knows exactly how the remaining bytes are composed, please provide the solution!

Regards,
Stefan.