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Home >> Cadillac >> 2009 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Hybrid Cooling System) >> Diagnostic Information and Procedures >> DTC P0A9C-P0A9E, P0AC6-P0AC8, P0ACB-P0ACD, P0AE9, P0AEA, or P0AEB >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Verify that DTCs P0A80, P0A81 and P0BBD are not set.
    2. WARNING: Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
    • Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors
    • Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors
      • Visually and functionally inspect the gloves before use.
      • Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or not.

    Failure to follow the procedure exactly as written may result in serious injury or death.
  2. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling .
  3. Remove the drive motor generator battery cover. Refer to Drive Motor Battery Case Upper Cover, Front Cover, and Right Side Cover Replacement .
  4. Inspect the battery for the following conditions:
    • Obstructed inlet or outlet duct
    • Damaged fan blades
    • Missing or damaged internal foam seals
    • If any of the conditions are present, repair or replace any damaged components.
  5. Ignition OFF, disconnect the X3 connector at the GBCM.
  6. Ignition OFF, test for less than 5 Ω between the low reference terminals of the GBCM listed below and ground.
    • Terminal 2
    • Terminal 4
    • Terminal 6
    • Terminal 8
    • If greater than the specified range, test the GBCM ground circuits for an open/high resistance. If the circuits test normal, replace the GBCM.
  7. Ignition ON, verify the scan tool Hybrid Batt. Mod. 1-4 Temperature parameters are -40°C (-40°F).
    • If greater than the specified value, replace the GBCM.
  8. Install a 3 A fused jumper wire between the appropriate signal terminal listed below and the low reference terminal 2 of the GBCM. Verify the appropriate scan tool Hybrid Batt. Mod. 1-4 Temperature is 100°C (212°F).
    • Terminal 1, for temperature sensor 1
    • Terminal 3, for temperature sensor 2
    • Terminal 5, for temperature sensor 3
    • Terminal 7, for temperature sensor 4
    • If less than the specified value, replace the GBCM.
  9. If all circuits test normal, test or replace the temperature sensors.
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