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Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC B1405 is not set.
    • Go to next step: If the DTC is not set 
  3. Verify DTC B095D 01, B095E 01, B095D 21, B095E 21 is not set.
    • If any of the DTCs are set 
    1. Verify none of the B306 Parking Assist Sensors - Rear are contaminated with snow, mud, dirt, slush, or ice.
      • If contaminated, clean the B306 Parking Assist Sensors - Rear.
      • Go to next step: If there is no contamination.
    2. Refer to Circuit/System Testing.
    • Go to next step: If none of the DTCs are set 
  4. Verify DTC B095D 3A, B095E 3A is not set.
    • If any of the DTCs are set 

      Replace the appropriate component: B306 Parking Assist Sensor - with the correct sensor type.

    • Go to next step: If none of the DTCs are set 
  5. Ignition - On / Vehicle - In Service Mode
  6. Verify the scan tool parameter:Parking Assist System Status = Enabled
    • If not the specified state 

      Refer to Circuit/System Testing.

    • Go to next step: If the specified state 
  7. All OK.


  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector: B306 Parking Assist Sensor
  3. Test for less than 10 ohms between the test points: Low Reference circuit terminal 3 & Ground
    • If 10 ohms or greater 
    1. Disconnect the electrical connector: X2@K182 Parking Assist Control Module
    2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 3@Component harness & The other end of the circuit@K182 Parking Assist Control Module
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K182 Parking Assist Control Module
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for 7 to 12 V between the test points:12 V Reference circuit terminal 1 & Ground
    • If greater than 12 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X2@K182 Parking Assist Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: V Reference circuit terminal 1@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K182 Parking Assist Control Module
    • If less than 7 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X2@K182 Parking Assist Control Module
    3. Test for infinite resistance between the test points: V Reference circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: V Reference circuit terminal 1 @ Component harness & The other end of the circuit@K182 Parking Assist Control Module
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K182 Parking Assist Control Module
    • Go to next step: If between 7 and 12 V 
  6. Test for 4 to 12 V between the test points: Signal circuit terminal 2 & Ground
    • If greater than 12 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: X2 & X3@K182 Parking Assist Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 2@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K182 Parking Assist Control Module
    • If less than 7 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:X2 & X3@K182 Parking Assist Control Module
    3. Test for infinite resistance between the test points: Signal circuit terminal 2@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points: Signal circuit terminal 2@Component harness & The other end of the circuit@K182 Parking Assist Control Module
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: K182 Parking Assist Control Module
    • Go to next step: If between 7 and 12 V 
  7. Replace the component for which the DTC was set.
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