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Circuit/System Testing

    NOTE:

    Use the schematic to identify the following:

    • The control module locations on the all GMLAN serial data circuits
    • The control module B+, ignition, ground, accessory wake up serial data 2, high voltage energy management communication enable and serial data circuit terminals
  1. Vehicle OFF, disconnect the low voltage harness connector at the T18 battery charger.
  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, 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 T18 battery charger for a short to ground. If the circuits test normal, replace the T18 battery charger.
  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 T18 battery charger for a short to ground. If the circuits test normal, replace the T18 battery charger.
  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. If equipped, vehicle in Service Mode, verify that a test lamp illuminates between the high voltage energy management communication enable 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.
  7. Vehicle OFF, disconnect the harness connector at the control module setting the DTC.
  8. 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 high voltage energy serial data circuit between the T18 battery charger 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 T18 battery charger and the control module setting the DTC.
  9. If all circuits test normal, replace the T18 battery charger.
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