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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify no HPCM or engine control module (ECM) DTCs are set that would disable high voltage or that identify a gear selector switch concern.
  2. Observe the HPCM IMS Range parameter display with a scan tool. The display should indicate Park or Neutral.
  3. Verify that serial data gateway module (SDGM) DTC B009F is not set.
  4. Observe the SDGM Hybrid Crash Status parameter. If the vehicle has not been involved in a collision the parameter should display No Crash.
    • If the parameter displays Crash Detected and/or the vehicle has been involved in a collision the high voltage system should be inspected for damage and the high voltage system re-enabled. Refer to High Voltage System Inspection .
  5. Verify the vehicle has not been in a collision that resulted in supplemental inflatable restrain (SIR) deployment.
    • If SIR deployment has occured the high voltage system should be inspected for damage and the high voltage system re-enabled. Refer to High Voltage System Inspection .
  6. Observe the BECM Hybrid Battery Pack Calculated voltage parameter with a scan tool. You should observe greater than 230 volts.
    • If the hybrid battery voltage is less than the specified value, attempt to charge the Hybrid Battery. Refer to Jump Assist .
  7. Turn the ignition to Crank. The engine should instantly start and run.
    • If the engine does not crank but audible transmission noise is observed while cranking, inspect the transmission for internal component failure. A seized engine or accessory drive could cause transmission damage during engine crank.
    • If the engine does not crank and no audible transmission noise is observed replace the drive motor generator power inverter module (PIM).
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