Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

2014 Freightliner 122SD 1939 data link

Discussion in 'Freightliner Forum' started by Bhambig, Jan 12, 2019.

  1. Jan 12, 2019 #1
    Bhambig

    Bhambig Bobtail Member

    3
    0
    Jan 12, 2019
    0
    Hi all,
    I am working on a 2014 122SD and I am having trouble finding one of the J1939 data link terminating resistors. I have 120 ohms of resistance on the data link. I found one resistor in the B pillar on the driver side but cannot find the other. Any advice?
     
    Bhambig, Jan 12, 2019
    Bhambig, Jan 12, 2019
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Jan 12, 2019 #2
    Working2party

    Working2party Medium Load Member

    608
    724
    Feb 10, 2018
    Kansas
    0
    What other options does your truck have. We have virtual technician, so our j1939 circuit runs from the ABS/RSS module on the right frame rail, forward to the cross member just behind the cab, across and up to the left rear bottom corner of the cab, under the driver door kick plate, across the dash to the passenger door kick plate, back to the right rear cab J-post, up, back forward above the right door, then to the VT com box located in the top center forward overhead compartment. We ended up tracing that #### circuit trying to find a pinch.

    Once it was found the driver said, “We’ll that makes sense, the issue did show up after I re-tightened the screws for the overhead compartment”
     
    Working2party, Jan 12, 2019
    Working2party, Jan 12, 2019
    #2
  4. Jan 13, 2019 #3
    Bhambig

    Bhambig Bobtail Member

    3
    0
    Jan 12, 2019
    0
    Thanks for the info.

    It has a DD15 with an Eaton Ultrashift behind it. I saw a TSB for the virtual assistant and checked to see if it has one and it does.

    I have checked at the CPC, TCM, VT, and ABS module. All have 120 ohms on the J1939. If I unplug the resistor at the driver side B piller they all show open indicating the backbone harness is good to all of their “legs” of the harness so I am thinking the issue is going to be close or at the other terminating resistor but I have looked for about 4 hours and haven’t been able to locate it.
     
    Bhambig, Jan 13, 2019
    Bhambig, Jan 13, 2019
    #3
  5. Jan 13, 2019 #4
    QUALITYTRUCK

    QUALITYTRUCK Road Train Member

    1,780
    1,726
    Jun 14, 2009
    romulus,mi
    0
    Make sure it doesn't have an old qualcomm harness hanging off the back of the cab. If so, the pins corrode and the j1939 high/low bridges.
     
    QUALITYTRUCK, Jan 13, 2019
    QUALITYTRUCK, Jan 13, 2019
    #4
  7. Jan 13, 2019 #5
    Bhambig

    Bhambig Bobtail Member

    3
    0
    Jan 12, 2019
    0
    I don’t see a Qualcomm harness and still haven’t been able to locate the other terminating resistor.
     
    Bhambig, Jan 13, 2019
    Bhambig, Jan 13, 2019
    #5
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.