What the port does
The auxiliary CAN bus port is a 4-pin Deutsch DTM connection on the Elite. You can set it to carry either Haltech CAN data, for Haltech dashes, keypads and expanders, or vehicle CAN data, for talking to factory modules. Pick the one that suits what you're plugging in; the Haltech CAN bus selection and vehicle CAN bus selection guides cover the settings.
Ready-made cables are available to plug straight in. If you're building your own, a matching DTM-4 connector set does the job, and a 4-port DTM-4 CAN hub lets several devices share the bus.
Pinout
| Function | Pin | Wire color |
|---|---|---|
| Power, +12V | 1 | Red |
| Signal ground | 2 | Black |
| CAN High | 3 | White |
| CAN Low | 4 | Blue |
Pin numbers are as seen from the back of the connector, the side the wires go into. It's easy to mirror the pinout by looking at the mating face instead, so double check before crimping.
Check that CAN High and CAN Low aren't swapped, that the port is set to the right bus type, and that the device has power on pin 1 and ground on pin 2.
For the bigger picture, see our CAN bus overview.
