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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 324 (Parking Assistance Systems) >> Diagnostic Information and Procedures >> DTC B13B0 or B13B1 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the connector at the appropriate B166 Advanced Parking Assist Alarm Sensor:
    • DTC B13B0 = B166M Advanced Parking Assist Alarm Sensor - Side Left Rear
    • DTC B13B1 = B166N Advanced Parking Assist Alarm Sensor - Side Right Rear
  2. Verify a test lamp illuminates between low reference circuit terminal 3 and B+
    • If the test lamp does not illuminate 
    1. Test circuit 2379 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 K182 Parking Assist Control Module
    • Go to next step: If the test lamp illuminates 
  3. Ignition ON.
  4. Test for greater than 6 V between voltage reference circuit terminal 1 and ground.
    • If 6 V or less 
    1. Test circuit 2374 for a short to ground.
      • 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
    2. Test circuit 2374 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
    3. Replace the K182 Parking Assist Control Module
    • Go to next step: If greater than 6 V 
  5. Test for 4.0 - 12.0 V between signal circuit terminal 2 and ground.
    • If less than 4.0 V 
    1. Test the appropriate circuit for a short to ground:
      • DTC B13B0 = Circuit 3156
      • DTC B13B1 = Circuit 3157
      • 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
    2. Test the appropriate circuit for an open/high resistance:
      • DTC B13B0 = Circuit 3156
      • DTC B13B1 = Circuit 3157
      • 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
    3. Replace the K182 Parking Assist Control Module
    • If greater than 12.0 V 
    1. Test the appropriate circuit for a short to voltage:
      • DTC B13B0 = Circuit 3156
      • DTC B13B1 = Circuit 3157
      • 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
    2. Replace the K182 Parking Assist Control Module
    • Go to next step: If between 4.0 - 12.0 V 
  6. Replace the appropriate B166 Advanced Parking Assist Alarm Sensor.
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