BMW E92 M3 CAN signals

[martind]

It appears that the CAN signals are brought out on the OBD connector of the M3. Has anyone had tried to tap in on the OBD CAN+ and CAN- signals?

Thanks,
Martin.

[PencilGeek]

The CAN signals do not appear on the OBD port. You need to tap the CAN bus under the passenger glove box. The video link I just sent you in your other thread shows a bunch of CAN bus stuff:
Steering,
Brakes,
Gas,
RPM,
I even put in the DSC light.

[martind]

Thanks for the tip and the post of the video on the other thread. Do you have instructions for tapping into the CAN bus inside the glove box?

Thanks

[PencilGeek]

Thanks for the tip and the post of the video on the other thread. Do you have instructions for tapping into the CAN bus inside the glove box?

Thanks

Here's a link where you can look this up on the Racelogic web site. Look for BMW 3-Series 2005+ (same as E92 M3).
http://www.velocitybox.co.uk/index.php?option=com_content&view=article&id=45:can-database&catid=14&Itemid=6

In a nutshell, you don't want to do this inside the glove box -- it's far too tight. Instead, take off the kick shield below the passenger glove box with a torx driver. You will see a bundled connector into a junction box. Remove the junction box connector and find the red/blue +red twisted pair of wires. Red/blue is CAN-HIGH and red is CAN-LOW.

[martind]

Here's a link where you can look this up on the Racelogic web site. Look for BMW 3-Series 2005+ (same as E92 M3).
http://www.velocitybox.co.uk/index.php?option=com_content&view=article&id=45:can-database&catid=14&Itemid=6

In a nutshell, you don't want to do this inside the glove box -- it's far too tight. Instead, take off the kick shield below the passenger glove box with a torx driver. You will see a bundled connector into a junction box. Remove the junction box connector and find the red/blue +red twisted pair of wires. Red/blue is CAN-HIGH and red is CAN-LOW.

Thanks,
To tap in do I just strip of some of the insulation and connect the CAN-HIGH and CAN-LOW wires from the VBox?

[PencilGeek]

Thanks,
To tap in do I just strip of some of the insulation and connect the CAN-HIGH and CAN-LOW wires from the VBox?

I connected a female DB9 connector to the car's CAN bus signals. Then I modified the vbox cable to have the male end of the DB9. I've got a few different CAN bus analyzers and they all use male DB9 connectors to pins 2 & 7, so using a female DB9 made the most sense for me.