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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 103 (Antilock Brake System) >> Diagnostic Information and Procedures >> DTC C0500-C0504, C0506-C0510, C0512-C0516, C050A, or C050C-C050F >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    Use the DTC descriptor to determine the appropriate B5 Wheel Speed Sensor to perform testing on.

  1. Inspect the appropriate wheel speed sensor for damage or incorrect part
    • If a condition exists 

      Replace the appropriate Wheel Speed Sensor

    • Go to next step: If no conditions exist 
  2. Ignition OFF, disconnect the harness connector at the K160 Brake System Control Module, ignition ON.
  3. Test for less than 1 V between the appropriate signal circuit terminal and ground:
    • B5LF Front Wheel Speed Sensor - Left = Terminal 21
    • B5RF Front Wheel Speed Sensor - Right = Terminal 42
    • B5LR Rear Wheel Speed Sensor - Left = Terminal 39
    • B5RR Rear Wheel Speed Sensor - Right = Terminal 20
    • If 1 V or greater 
    1. Test the appropriate circuits for a short to voltage:
      • B5LF Front Wheel Speed Sensor - Left = Circuit 7064 and circuit 830
      • B5RF Front Wheel Speed Sensor - Right = Circuit 7065 and circuit 872
      • B5LR Rear Wheel Speed Sensor - Left = Circuit 7127 and circuit 884
      • B5RR Rear Wheel Speed Sensor - Right = Circuit 7128 and circuit 882
      • If a short to voltage is found, repair the circuit fault.
      • Go to next step: If a short to voltage is not found
    2. Replace the appropriate B5 Wheel Speed Sensor.
    • Go to next step: If less than 1 V 
  4. Ignition OFF.
  5. Test for infinite resistance between the appropriate signal circuit terminal and ground:
    • B5LF Front Wheel Speed Sensor - Left = Terminal 21
    • B5RF Front Wheel Speed Sensor - Right = Terminal 42
    • B5LR Rear Wheel Speed Sensor - Left = Terminal 39
    • B5RR Rear Wheel Speed Sensor - Right = Terminal 20
    • If less than infinite resistance 
    1. Test the appropriate circuits for a short to ground:
      • B5LF Front Wheel Speed Sensor - Left = Circuit 7064 and circuit 830
      • B5RF Front Wheel Speed Sensor - Right = Circuit 7065 and circuit 872
      • B5LR Rear Wheel Speed Sensor - Left = Circuit 7127 and circuit 884
      • B5RR Rear Wheel Speed Sensor - Right = Circuit 7128 and circuit 882
      • If a short to ground is found, repair the circuit fault.
      • Go to next step: If a short to ground is not found
    2. Replace the appropriate B5 Wheel Speed Sensor.
    • Go to next step: If infinite resistance 
  6. Test for less than infinite resistance between the appropriate signal circuit terminals:
    • B5LF Front Wheel Speed Sensor - Left = Terminal 21 and terminal 7
    • B5RF Front Wheel Speed Sensor - Right = Terminal 42 and terminal 26
    • B5LR Rear Wheel Speed Sensor - Left = Terminal 39 and terminal 23
    • B5RR Rear Wheel Speed Sensor - Right = Terminal 20 and terminal 37
    • If infinite resistance 
    1. Test the appropriate circuits for an open/high resistance:
      • B5LF Front Wheel Speed Sensor - Left = Circuit 7064 and circuit 830
      • B5RF Front Wheel Speed Sensor - Right = Circuit 7065 and circuit 872
      • B5LR Rear Wheel Speed Sensor - Left = Circuit 7127 and circuit 884
      • B5RR Rear Wheel Speed Sensor - Right = Circuit 7128 and circuit 882
      • If an open/high resistance is found, repair the circuit fault.
      • Go to next step: If an open/high resistance is not found
    2. Replace the appropriate B5 Wheel Speed Sensor.
    • Go to next step: If less than infinite resistance 
  7. Replace the appropriate B5 Wheel Speed Sensor.
  8. Clear DTCs and operate the vehicle within the Conditions for Running the DTC.
  9. Verify the DTC does not reset.
    • If the DTC resets 

      Replace the K160 Brake System Control Module.

    • Go to next step: If the DTC does not reset 
  10. All OK.
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