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Home >> Chevrolet >> 2017 >> Traverse LT, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U1500-U15FF: Control Module >> Circuit/System Testing
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Circuit/System Testing

NOTE:
  • Use the schematic to identify the following:
    • LIN devices the vehicle are equipped with
    • The LIN device's B+, ignition, ground, and serial data circuit terminals
  • Use the Control Module U-Code list to determine which control module is not communicating with the master control module. Refer to Control Module U Code List .
  • A loss of serial data communications DTC does not represent a failure of the master control module that set it.
  1. Ignition OFF, disconnect the harness connector at a LIN device that is not communicating.
  2. Test for less than 10 Ω between each ground circuit terminal and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. If equipped, verify that a test lamp illuminates between each B+ circuit terminal and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the LIN device for a short to ground. If the circuits test normal, replace the LIN device.
  4. If equipped, ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the LIN device for a short to ground. If the circuits test normal, replace the LIN device.
  5. Ignition ON, test for 2 - 12 V between the LIN serial data circuit and ground.
    • If greater than the specified range, test the LIN serial data circuit for a short to voltage. If the circuit tests normal, replace the master control module.
    • If less than the specified range, test the LIN serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the master control module.
  6. If all circuits test normal, replace the LIN device.
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