can bus wire bmw 745li

Something i found...No support for those vehicles...And the last one i saw was checking a cd changer in the trunk...Will post if i find anything further...

1. We recommend that the CAN HIGH and CAN LOW connections are picked up from the automatic gearbox ECU where possible, as this has the least amount of data flowing in the system. Note: it is also possible on some vehicles to pick up the CAN wires at the ignition switch, e.g. Mercedes.

2. Because manufacturers continually change the pin configuration of the plugs, it is advisable to pick up +POS and -NEG for powering the interface from an alternative supply, preferably a good ignition controlled regulated supply. A good earth is absolutely essential.

3. Connecting the CANBUS interface close to the ECU, say 5 to 10 cm away from the plug will allow room for the connectors. While the power wires CAN be extended, it is not advisable to extend the CAN HIGH and CAN LOW leads. If there is a need to extend the signal lead (orange), please ensure that it is run to its destination avoiding proximity to equipment that might give off pulses which could be picked up by this wire, such as ignition or heater fans, etc. Common sense tells you that each wire can become an aerial for extraneous signals within a vehicle environment.

4. Note that just because a vehicle has a CANBUS system, it does not necessarily mean that that CANBUS carries speed signal information. Also some vehicles can have more than one CANBUS network and usually only one carries the speed signal information.