Interior lights won’t turn on when driver door opened- 2017 Cascadia

Discussion in 'Freightliner Forum' started by corneileous, Jan 2, 2025.

  1. corneileous

    corneileous Road Train Member

    1,362
    334
    Nov 19, 2009
    Podunk, OK
    0
    Hey guys, just as the title says but when the passenger door is opened, the lights will turn on. Any ideas? Fuses are good- at least I think so.

    Being that that I’ve had some time off, I decided to pull the door panel off to inspect the latch switch but everything seems fine. Even unplugged the harness that goes to the latch and inspected it. Looked good except when poking a test light in all for pin holes, none lighted the LED. I also noticed that the door lock switch on that side doesn’t work but it works on the passenger side and, it locks both doors. The window switches work, too, both doors.

    While I was at it, I pulled the driver side kick panel and inspected all the harnesses that come from the door- again, all was good.

    Thanks in advance.
     
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

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

  3. corneileous

    corneileous Road Train Member

    1,362
    334
    Nov 19, 2009
    Podunk, OK
    0
  4. SWM_TECH

    SWM_TECH Light Load Member

    139
    144
    Apr 15, 2018
    0
    QUALITYTRUCK Thanks this.
  5. corneileous

    corneileous Road Train Member

    1,362
    334
    Nov 19, 2009
    Podunk, OK
    0
  6. SWM_TECH

    SWM_TECH Light Load Member

    139
    144
    Apr 15, 2018
    0
    SAMCAB fuse F13 a 20 amp shows for door locks or Collision avoidance system, so check that also. According to the SAM Wall chart the door open switch , driver side return is coming back to the SAMCAB on connector X8/1. I suggest you post the last six of your VIN and perhaps someone with access to chassis wiring can get your the wiring diagrams, so you can trace & test your wiring circuit.
     
  7. SWM_TECH

    SWM_TECH Light Load Member

    139
    144
    Apr 15, 2018
    0
    Found this in the Cascadia Troubleshooting manual
    "The dome and footwell lamps are activated by opening the driver or passenger door. Opening and closing the door actuates a switch that is part of the door latch assembly in each door.

    Continuity across door switch (switch closed) = door open

    No continuity across door switch (switch open) = door closed
    There is continuity across the door switch when the door latch is in the open or primary latch position. There is no continuity across the switch when the latch is fully closed on the secondary latch position. To open the switch (interrupt the current path) the latch must be in the secondary latched position. Constant battery power is supplied to each door switch from SAM Cab fuse F13, pin X8.6. When the door switch is open, a 12V signal is returned to the SAM Cab (pin X8.1 for the driver side and pin X17.5 for the passenger side)."
     
  8. SWM_TECH

    SWM_TECH Light Load Member

    139
    144
    Apr 15, 2018
    0
    Also, found this:
    The primary input for the dome lamps are the driver and passenger door actuators. The front dome lamp switch is a secondary input in Cascadia Day Cabs with premium lighting.
    NOTE: Use the Datalink Monitor template or DiagnosticLink panel "Interior Lighting - Dome, Entrance and Footwell" to monitor the status of the door latches. The door latches may need adjustment if they cannot be put in the secondary latch position.
    1. Insert conducting probes into the following terminal pairs on the SAM Cab:
    X8.1(–) and X8.6(+), driver door
    X17.5(–) and X8.6(+), passenger door
    2. Measure the voltage across the terminal pairs with the door closed and open.
    3. Compare the results in Table 9 .
    4. If one of the doors does not go to 0V with the door open, measure the other door circuit to verify the output from the SAM Cab. Check fuse F13 if the door closed voltage is 0V for both doors.
    5. Remove connectors X8 and X17. Perform a continuity test with the door open on the following terminal pairs to check for continuity:
    X8.6 and X8.1 for circuits 108T and 443
    X8.6 and X17.5 for circuits 108U and 443
    6. If no continuity is found, measure for continuity from the door lock actuator to the SAM Cab.
    6.1 Remove the interior door panel.
    6.2 Remove the door module.
    6.3 Remove the door lock actuator connector.
    6.4 Measure for continuity across the following connector pairs:
    X8.6 and left door lock actuator pin 2, circuit 443
    X8.1 and left door lock actuator pin 1, circuit 108T
    X8.6 and right door lock actuator pin 2, circuit 443
    X17.5 and left door actuator, pin 1, circuit 108U
    6.5 If continuity is found for both circuits connected to the door lock actuator, replace the door lock actuator.
    Table_9.png Table_9.png
     
  9. corneileous

    corneileous Road Train Member

    1,362
    334
    Nov 19, 2009
    Podunk, OK
    0
    Many thanks for all that.
     
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

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