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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 32 (Parking Assistance Systems) >> Diagnostic Information and Procedures >> DTC B1405 (UFQ) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:X2 & X3@K182 Parking Assist Control Module
  3. Test for infinite resistance between the test points:Terminal 4 X2 & Ground
    • If less than infinite resistance 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:B306 Parking Assist Sensor - All - Rear
    3. Test for infinite resistance between the test points:8 V Reference circuit terminal 4@Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:B306 Parking Assist Sensor
    • Go to next step: If infinite resistance 
  4. Test for infinite resistance between the test points:Terminal 1 X3 & Ground
    • If less than infinite resistance 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:B306 Parking Assist Sensor - All - Front
    3. Test for infinite resistance between the test points:8 V Reference circuit terminal 1@Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:B306 Parking Assist Sensor
    • Go to next step: If infinite resistance 
  5. Ignition - On / Vehicle - In Service Mode
  6. Test for less than 1 V between the test points:Terminal 4 X2 & Ground
    • If greater than 1 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:B306 Parking Assist Sensor - All - Rear
    3. Test for less than 1 V between the test points:8 V Reference circuit terminal 4@Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:B306 Parking Assist Sensor
    • Go to next step: If less than 1 V 
  7. Test for less than 1 V between the test points:Terminal 1 X3 & Ground
    • If greater than 1 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:B306 Parking Assist Sensor - All - Front
    3. Test for less than 1 V between the test points:8 V Reference circuit terminal 1@Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:B306 Parking Assist Sensor
    • Go to next step: If less than 1 V 
  8. Ignition/Vehicle & All vehicle systems - Off
  9. Connect all electrical connectors.
  10. Ignition - On / Vehicle - In Service Mode
  11. Verify DTC B1405 is not set.
    • If the DTC is set 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:B306 Parking Assist Sensor - All - Front & Rear
    3. Ignition - On / Vehicle - In Service Mode
    4. Verify DTC B1405 is not set.
      • If the DTC is set

        Replace the appropriate component:K182 Parking Assist Control Module

      • Go to next step: If the DTC is not set
    5. Connect the electrical connector:B306 Parking Assist Sensor - One at a time

      Verify DTC B1405 is not set.

      • If the DTC sets - Replace the component that failed the test:B306 Parking Assist Sensor
      • Go to next step: If the DTC is not set
    6. All OK.
    • Go to next step: If the DTC is not set 
  12. All OK.
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