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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Rear Drive Axle - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC C10A6 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the connector at the M135 Differential Lock Motor.
  2. Verify a test lamp illuminates between the low reference circuit terminal 8 and B+.
    • If the test lamp does not illuminate 
    1. Test circuit 7977 for an open/high resistance
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the K164 Differential Control Module.
      • Go to next step: If the test lamp illuminates 
  3. Disconnect the X2 harness connector at the K164 Differential Control Module.
  4. Test for a short to ground on circuit 7978.
    • If a short to ground is found, repair the fault on the circuit. 
    • Go to next step: If a short to ground is not found. 
  5. Ignition ON.
  6. Test circuit 7978 for a short to voltage.
    • If a short to voltage is found, repair the fault on the circuit. 
    • Go to next step: If a short to voltage is not found. 
  7. Ignition OFF.
  8. Test circuit 7978 for an open/high resistance.
    • If an open/high resistance is found, repair the fault on the circuit. 
    • Go to next step: If an open/high resistance is not found. 
  9. Replace the M135 Differential Lock Motor.
  10. Operate the vehicle under the Conditions for Running the DTC.
  11. Verify the DTC does not reset.
    • If the DTC resets 

      Replace the K164 Differential Control Module

    • Go to next step: If the DTC does not reset 
  12. A fault is not currently present and may be an intermittent condition.
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