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Circuit/System Testing

    NOTE:

    Use the schematic to identify the following:

    • Control module location on the powertrain high speed GMLAN serial data circuits
    • Control module B+, ignition, ground, accessory wake up serial data 2 and serial data circuit terminals.
  1. Vehicle OFF, disconnect the X1 and X2 harness connectors at the T6 power inverter module.
  2. Test for less than 5 Ω between the T6 power inverter module case and ground.
    • If greater than the specified range, test the ground strap for an open/high resistance.
  3. If equipped, vehicle in Service Mode, 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 T6 power inverter module for a short to ground. If the circuits test normal, replace the T6 power inverter module.
  4. If equipped, vehicle in Service Mode, 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 T6 power inverter module for a short to ground. If the circuits test normal, replace the T6 power inverter module.
  5. If equipped, vehicle in Service Mode, verify that a test lamp illuminates between the accessory wake up serial data 2 circuit terminal and ground.
    • If the test lamp does not illuminate, test the entire circuit, including the B+ circuit to the K114B hybrid powertrain control module 2, for an open/high resistance or short to ground. If the circuits test normal, replace the K114B hybrid powertrain control module 2.
  6. Vehicle OFF, disconnect the harness connector at the control module setting the DTC.
  7. Vehicle OFF and all vehicle systems OFF, all keys at least 3 meters away from vehicle, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 2 Ω in each powertrain high speed GMLAN serial data circuit between the T6 power inverter module and the control module setting the DTC.
    • If greater than the specified range, test the serial data circuit for an open/high resistance between the T6 power inverter module and the control module setting the DTC.
  8. If all circuits test normal, replace the T6 power inverter module.
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