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Home >> Cadillac >> 2013 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Hybrid/EV Control System) >> Diagnostic Information and Procedures >> DTC P181C-P181F, P183A-P183E, P184A, or P184B >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF. Disconnect the X175/X176 24-way harness connector at the transmission.
  2. Install the DT-48493  jumper harness to the vehicle harness side only.
    3. NOTE:

    The ignition must be ON to test the low reference circuit. Other DTCs will set with the X175/X176 connector disconnected.

  3. Ignition ON, test for less than 10 Ω between the low reference circuit terminal 5 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the T6 Power Inverter Module.
  4. Verify each scan tool D1/D2/R1/R2 parameter displays high.
    • If any parameter displays low, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the T6 Power Inverter Module.
    • Parameter D1 - terminal 3
    • Parameter D2 - terminal 4
    • Parameter R1 - terminal 1
    • Parameter R2 - terminal 2
  5. Install a 3 A fused jumper wire between each terminal listed below one at a time and ground. Verify each scan tool D1/D2/R1/R2 parameter displays low when grounded.
    • If a parameter displays high when grounded, test the signal circuit terminal listed below for a short to voltage or an open/high resistance. If the circuit tests normal, replace the T6 Power Inverter Module.
    • Parameter D1 - terminal 3
    • Parameter D2 - terminal 4
    • Parameter R1 - terminal 1
    • Parameter R2 - terminal 2
  6. Ignition OFF, disconnect the X1 16-way harness connector at the transmission.
  7. Install the DT-47825-10  jumper harness to the vehicle harness side only.
  8. Ignition ON, verify the scan tool S parameter displays high.
    • If the S parameter displays low, test the signal circuit terminal 3 X1 for a short to ground. If the circuit tests normal, replace the T6 Power Inverter Module.
  9. Install a 3 A fused jumper wire between the signal terminal 3 X1 and ground. Verify the scan tool S parameter is low.
    • If the S parameter displays high, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the T6 Power Inverter Module.
  10. If the circuits test normal, refer to Component Testing .
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