X431 Connector Guide

A few rules of thumb:
1. If the car has an OEM-style connector which is included in the X431 and an OBD-II connector, the OEM-style will usually provide the most capabilities for accessing OEM data.
Current examples are:
-Mercedes 38
-BMW 20
-Subaru 9
-Kia 20
-Mazda 17
-Nissan 14+16
-Mitsubishi/Hyundai 12+16
-Toyota/Lexus 17
2.If the car has only an OBD-II connector, that connector will usually provide both OEM and generic (OBD-II) capabilities.
3.In many cases the Canbus II connector can be used when the selection calls for an OBD II-16c or a Canbus connector (see Canbus guidelines)
Canbus Guidelines
1.If the vehicle side of the 16 pin DCL has a female pin in the #6 and #14 pin positions, the vehicle is a Canbus vehicle
2.Canbus usage has been PHASED-IN since 1999.
3.Year model overlap indicated in the connector guide might require trying both connectors listed
4.All light duty vehicles sold in the US in 2008 are Canbus compatible
5.A Canbus II connector can communicate with a non-Canbus system in many cases, only Canbus connectors can communicate with Canbus systems.
6.The Canbus II replaces the Canbus and Volvo Canbus connectors
7.The Canbus II can be flash programmed, the current version as of 3/2008 is 2.1. The download is available online. The tutorial is available online and on this CD.

Source