I have an ELM327 Bluetooth, which I'm linking to ubuntu powered PC. My end goal is to install a raspberry pi into the car and have it automate things like automatically opening the roof and locking the doors when the vehicle reaches a certain speed. Also, turning on the headlights would be nice(based on a light sensor connected via GPIO). I'm attempting to follow http://theksmith.com/software/hack-vehicle-bus-cheap-easy-part-2/ , but I'm stuck at the identification part. I can't seem to find a single message for each action, and transmitting the messages back into the canbus seems impossible to achieve even with the help of the command list. If there's a list of commands for the Honda Jazz 2009 it would be great.
You can send raw (CAN) frames on an ELM327. You can also sniff/monitor the CAN bus on an ELM327. The accepted answer above is not correct.
If you look at the free AUtoCommander product it, and it supports the ELM327 adapter. (as well as PeakCAN/SocketCAN/STNxxxx adapters). I use it to send and replay CAN frames with an ELM327