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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 C1135 >> Circuit/System Testing

Circuit/System Testing

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C1135 13 or C1135 92 

  1. Ignition OFF, disconnect the X1 harness connector at the K164 Differential Control Module, ignition ON/Vehicle in Service Mode.
  2. Test for less than 1 V between the K164 Differential Control Module harness connector terminals listed below and ground.
    • Terminal 1
    • Terminal 4
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  3. Ignition OFF.
  4. Test for infinite resistance between K164 Differential Control Module harness connector terminals listed below and ground.
    • Terminal 1
    • Terminal 4
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If Infinite resistance 
  5. Disconnect harness connector at the M135 Differential Lock Motor.
  6. Test for less than 2 Ω between M135 Differential Lock Motor harness connector terminal 3 and K164 Differential Control Module harness connector terminal 1 end to end.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  7. Test for less than 2 Ω between M135 Differential Lock Motor harness connector terminal 2 and K164 Differential Control Module harness connector terminal 4 end to end.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  8. Test or replace the M135 Differential Lock Motor.
  9. Operate the vehicle under the conditions for setting the DTC, the DTC should not set.
    • If the DTC sets 

      Replace the K164 Differential Control Module.

    • Go to next step: If no DTC sets 
  10. All OK

C1135 67, C1135 71, C1135 77, or C1135 98 

  1. Verify there are no other DTCs set.
    • Go to next step: If no other DTCs are set 
  2. Check for updated software in K164 Differential Control Module.
    • If software is not current 
    1. Perform programming and learn procedure for the K164 Differential Control Module.
    2. Verify DTC does not reset.
      • If the DTC sets

        Replace the M135 Differential Lock Motor.

      • Go to next step: If the DTC does not set
    3. All OK.
    • Go to next step: If software is up to date 
  3. Replace the M135 Differential Lock Motor.
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