Freightliner J1939 Wiring Diagram
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.
Freightliner j1939 wiring diagram. Refer to freightliner or component supplier literature or wiring diagrams for the specific component. 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. 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. An unused sae j1939 drop leg will need to be located or created to make the j1939 connection.
Reference vehicle wiring schematics for additional wiring information. Locate the pins for j1939 and j1939. Locate the vehicle s j1939 terminating it will connect to green and yellow wires labeled j1939. Consult vehicle manufacturer for recommended connection methods.
For additional wiring diagrams and j1939 fault codes see freightliner doc c02 03 when testing ac portion of unit espar heater must be disconnected. This will give the installer access to the j1939 terminating resistor. Removing fuse f2 for 5 10 seconds will reset the main system controller to factory default settings. 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.
The j1939 data link has two 120 ohm resistors in parallel in the data link. Freightliner wiring diagrams free welcome to my site this article will go over about freightliner wiring diagrams free. This troubleshooting method will work for all truck makes but i will use a freightliner columbia in my example. Service bulletins freightliner page 7.
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