I just looked: there is a very well placed OBD II 16-pin connector.It looks just like the picture at
http://www.obdii.com/connector.htmlThe Controller Area Network (CAN) pins seem promising. Some generic info on CAN:CAN is a serial bus system especially suited to interconnect smart devices to build smart systems or sub-systems. The attributes of a Controller Area Network (CAN) are:the multi-master capabilities that allows to build smart and redundant systems without the need of a vulnerable master, the broadcast messaging that is the first piece of the guarantee for 100% data integrity as any device within the network is using the very same information, the sophisticated error detecting mechanism and the retransmission of faulty messages which is the second piece of the guarantee for 100% data integrity, the availability of more than 50 controllers from low-cost devices to high-end chips from more than 15 manufacturers announced and available, and the availability for the next 15 years as its use within the European automotive industry an the decision for CAN from the US and Japan automotive industry.