USBTin and 2010 Jeep Patriot

General discussion about interfacing with the CAN bus
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Thanatos
How the heck did I end up here?
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Joined: 2016 Mar 30 22:09

USBTin and 2010 Jeep Patriot

Post by Thanatos » 2016 Apr 02 20:08

Hello,
I am using a USBTin, http://www.fischl.de/usbtin/, to connect to the stereo plug (Can H and L) in my Jeep. I wrote a perl script to log what it sees. I read that this bus is probably 1M baud (S8), but I think it may actually be 10K baud (S0). I get a lot more data but it could just be garbage. If anyone knows what it really should be, please let me know.
The data that it gives looks like this:
t2FF80DF43A3F7B9E9296
t22730DF43A
t0FF30DF43A
t2FB34CDF27
t22320DF4

Is there a database some where that I could use to give me a head start or am I on my own parsing this?

Also confusing is that on wikipedia the example CAN frame is shown as 55 bits, so I am not even sure how this would be sent as bytes (multiples of 8 bits).
I would appreciate some help or to be pointed in the right direction.

Thank you,
Thanatos

g0tcha
How the heck did I end up here?
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Joined: 2017 Nov 04 07:43

Re: USBTin and 2010 Jeep Patriot

Post by g0tcha » 2017 Nov 04 08:12

hi

what you trying to accomplish ?

Thanatos
How the heck did I end up here?
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Joined: 2016 Mar 30 22:09

Re: USBTin and 2010 Jeep Patriot

Post by Thanatos » 2018 Feb 25 22:09

At this point, pretty much doing anything would be nice. My simplest goal was to at least see the radio control buttons on the steering wheel and then work up to injecting data as well. But so far (gave up in about December 2016, wires have been sticking out of the dash for almost two years) just what appears to be garbage coming through the USBTin.

nemiro
CAN? Tin or aluminum?
Posts: 35
Joined: 2015 Feb 07 20:06

Re: USBTin and 2010 Jeep Patriot

Post by nemiro » 2018 Feb 28 21:11

If you are in to the radio bus, believe that would be CAN-B bus. For your model, I would suspect the speed to be 83.3k, but it may possibly be 125k. It is almost certainly not 1M, and it is definitely not 10k.

poop713
Yes, we CAN hack!
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Joined: 2017 Feb 09 23:31

Re: USBTin and 2010 Jeep Patriot

Post by poop713 » 2018 Mar 01 20:29

More likely 500k baud.
The data your seeingn is extended frame format.

nemiro
CAN? Tin or aluminum?
Posts: 35
Joined: 2015 Feb 07 20:06

Re: USBTin and 2010 Jeep Patriot

Post by nemiro » 2018 Mar 04 22:07

poop713 wrote:
2018 Mar 01 20:29
More likely 500k baud.
The data your seeingn is extended frame format.
Not if he is on the 'radio' (interior, CAN-B) bus.

nemiro
CAN? Tin or aluminum?
Posts: 35
Joined: 2015 Feb 07 20:06

Re: USBTin and 2010 Jeep Patriot

Post by nemiro » 2018 Mar 04 22:10

BTW, the 2010 Patriot should be LOW speed, or 83.3k.

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