Comments on: Mazda CAN Bus

By: alex

alex — Fri, 30 Dec 2011 09:14:48 +0000

Hello,

I am working on a project that requires measuring individual wheel speeds. The problem is I have a 2011 Subaru WRX, and I was wondering how would I go about can bus sniffing to obtain those pids.

By: chema

chema — Wed, 07 Dec 2011 06:27:16 +0000

more info about CD changer protocol plz )

By: Jason

Jason — Tue, 06 Dec 2011 18:58:48 +0000

I’d imagine the DRL (Daytime Running Lights) aren’t controlled by the computer, it just doesn’t make sense to do so. Same with the door locks, they’d be handled by the body computer and it probably only takes a direct digital input, not a command over the CAN bus. Either way, both can be solved easily with a micro, some code and a little interface work and never have to touch the ECU.

By: Tim

Tim — Thu, 03 Nov 2011 21:01:55 +0000

Might have something to do with the CAN standard. If you look at this: http://www.keil.com/download/files/can_primer_2009sp.pdf it talks about how errors are controlled. Basically if an ECM (any device transmitting on CAN bus) detects that it is causing errors, it will remove itself from the bus. Perhaps this is the cause? Just a guess though, haven’t done any testing.

I have a Mazda that I’m planning on hooking up to a Beagleboard w/barker CAN interface and displayed on 7″ Xenarc. Short term project goals are to display information currently displayed on the in-dash LCD, ie: MPG, range etc… long term project goals would be to have iPhone tethered for internet on the move as well as streaming music to the radio with track data displayed on the Xenarc. Other long term goals (doubt these will ever happen) would include having active sensors for obstacle detection. Warnings would occur if say you had your turn signal on and were changing lanes into another car, for example, but other possible instances could be if your closure rate to a stopped car was too great.

-Tim

By: Alex

Alex — Tue, 18 Oct 2011 12:31:56 +0000

Hi,

I just bought new Mazda 6 2.2 129 PS.
Is there any way to reprogram and make automatic lights to work as a day lights. In Croatia day lights are mandatory, so instead having automatic lights when dark comes, I would like to have lights on every time I start the engine.

As well I would like to have automatic door lock to lock the doors once I start driving as it is on some another cars available.

Thanks,
Alex

By: Jill

Jill — Wed, 12 Oct 2011 13:21:03 +0000

I’m looking to get the odometer off a Mazda 6 2011 to display on my iPhone. Has anyone been able to do this? Do you know where to find it? The odometer for my 2007 Mazda 3 is in broadcast data but the 2011 Mazda 6 isn’t and I haven’t been able to find it.

By: Madox

Madox — Thu, 15 Sep 2011 06:40:18 +0000

There are service manuals out there… if you search hard enough

By: JasonP

JasonP — Thu, 15 Sep 2011 00:01:47 +0000

I’d love to know what manual you have that specifies CAN bus PIDs. Sounds useful.

By: YeYuS

YeYuS — Fri, 09 Sep 2011 02:48:12 +0000

Great work!, I need to do some work on the HS CAN later but I can confirm some of the PIDs with my 2005 Mazda3 2.0L.

0x20F -> Byte 0,1 -> Brake Pressure (I think it’s MPRETDR PID as stated in service manual)
0×205 -> Byte 2 -> Mask &0×40 -> Brake Pedal Switch (BOO_ABS PID in the manual)
0×228 -> Same here clutch and neutral
0×80 -> Same i think
0×212 -> confirmed

By: YeYuS

YeYuS — Fri, 09 Sep 2011 02:34:43 +0000

On my 2005 Mazda3 with the Bose Sound i got the following mappings:

none of the climate unit nor radio unit has special mapping except for two buttons

28F -> Byte 4 -> Mask &0×10 -> Clock Button
28F -> Byte 4 -> Mask &0×08 -> Info Button
28F -> Byte 4 -> Mask &0×80 -> The rest of the mapped functions

If you want to know which function is active:

28F -> Byte 3 -> 0×00 FM1
28F -> Byte 3 -> 0×22 FM2
28F -> Byte 3 -> 0×18 EX/CD

The only hope on this task is to sniff the HU unit protocol which is explained somewhere on the internets, I read some time ago a wiki about CD changer protocol and wheel buttons are mapped.