SSM2 via Serial

Application Layer

For an introduction to SSM2 see this RomRaider page. Does not cover advanced details though.
Tutorial shows working with a J2534 capable device using free generic software tool: Manual Serial Connection Tutorial.

Physical Layer

SSM2 works with serial (K-) line. This protocol looks like modified ISO 14230/KWP2000. Seems to be used by Subaru only.
SSM2 needs bidirectional serial communication on a single line called the K-line (pin 7 on the OBD-II-connector). L-Line (pin 15) ist not being used, as wakeup apparently is not required on SSM2 control units.

OBD-II (J1962 spec) female connector, often found below steering wheel:

 ____________________________________
 \  1   2   3   4   5   6   7   8   /
  \ 9   10  11  12  13  14  15  16 /
   \______________________________/

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s