CANHack.org

While doing some cruising through the 2007 Wrangler service manual, I found that the CAN interior bus (radio, amp, dash cluster, Intrusion transceiver module) is available on the OBDII connector as listed below:

• Pin 3 CIB+ (interior bus)
• Pin 11 CIB-
• Pin 6 Diagnostic CAN C+ (normal OBDII CAN connections)
• Pin 14 Diagnostic CAN C-
• Pin 16 +12
• Pin 4,5 ground
• Pin 7 SCI transmit

This is great news as one doesnt have to tap into the radio harness to access the CAN interior bus. A DPDT toggle switch in your OBD harness would allow an ELM327 based monitor to work either with the OBDII functions or to eavesdrop on the CIB.
I wonder how many post 2007 vehicles have pins 3 and 11 populated in the OBDII connector... have a look and update this post with what you find.
Bummer my 2010 Wrangler only has Pins 4,5,6,14 and 16 populated, so the CIB has to be accessed through the central gateway in the TIPM or a harness hack.

my 2014 Wrangler Unlimited also has pins 4,5,6,14, and 16 pins populated on the OBD2 port.

Just checked my 2015 wrangler, no such luck for the Interior bus on the OBD2 port either.

The 2012 JK doesn't have the CAN-IHS on the OBD2 plug, it only drops CAN-C from the TIPM. You have to jack into a device eg: the radio or at the TIPM directly itself to see the data. You'd struggle with a ELM327 due to the amount of data it throws out.