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Circuit/System Testing

    NOTE: Use the schematic to identify the following:
    • The control module location on the powertrain high speed GMLAN serial data circuits
    • The control module B+, ignition, ground, communication enable and serial data circuit terminals
  1. Ignition OFF, disconnect the harness connector at the K114B hybrid powertrain control module 2.
  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, ignition ON, 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 K114B hybrid powertrain control module 2 for a short to ground. If the circuits test normal, replace the K114B hybrid powertrain control module 2.
  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 K114B hybrid powertrain control module 2 for a short to ground. If the circuits test normal, replace the K114B hybrid powertrain control module 2.
  5. If equipped, ignition ON, verify that a test lamp illuminates between the wakeup circuit terminal and ground.
    • If the test lamp does not illuminate, test the entire circuit, including the B+ circuit to the K9 body control module (BCM), for an open/high resistance or a short to ground. If the circuits test normal, replace the K9 BCM.
  6. Ignition OFF, disconnect the harness connector at the T6 power inverter module.
  7. Test for less than 1 Ω in each powertrain high speed GMLAN serial data circuit between the K114B hybrid powertrain control module 2 and the T6 power inverter module.
    • If greater than the specified range, test the serial data circuit for an open/high resistance between the K114B hybrid powertrain control module 2 and the T6 power inverter module.
  8. If all circuits test normal, replace the K114B hybrid powertrain control module 2.
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