Freightliner J1939 Wiring Diagram

Service bulletins freightliner page 7. Locate the pins for j1939 and j1939. An unused sae j1939 drop leg will need to be located or created to make the j1939 connection.

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Freightliner j1939 wiring diagram. This will give the installer access to the j1939 terminating resistor. Consult vehicle manufacturer for recommended connection methods. Locating the j1939 data link wires locating a bent over pin inside the plug reviewing the information gathered and this would be a confident repair for the j1939 related faults found here. Refer to freightliner or component supplier literature or wiring diagrams for the specific component.

Reference vehicle wiring schematics for additional wiring information. Remove kick panel in the bottom middle of the dash. This troubleshooting method will work for all truck makes but i will use a freightliner columbia in my example. X2 3 obd j1939 bat x2 6 obd dcdi bat x1 7 hands free phone bat x3 11 radio bat x7 4 cabin hvac fan motor bat x7 3 sleeper hvac fan motor bat x8 4 door control driver bat x2 13 collision avoidance system bat x8 6 door lock bat cabin hvac controller acc x1 10 sleeper hvac controller acc x1 15.

Proper voltage ground and j1939 h1939 voltage. For additional wiring diagrams and j1939 fault codes see freightliner doc c02 03 when testing ac portion of unit espar heater must be disconnected. Locate the vehicle s j1939 terminating it will connect to green and yellow wires labeled j1939. Removing fuse f2 for 5 10 seconds will reset the main system controller to factory default settings.

The sae j1708 connection can typically be made near the 6 or 9 pin connector. Checking continuity and bandwidth of j1939 h1939 continuity and bandwidth tests should be conducted with all modules and 120ohm terminating resistors removed install a jumper wire across both legs of the network similar to the diagram below. The j1939 data link has two 120 ohm resistors in parallel in the data link. For freightliner m2 108sd 114sd and western star trucks this feature is not supported as wiring is spliced into the cab pto switches common with cruise control cannot be used with remote pto.

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