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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (Parking Assistance Systems) >> Diagnostic Information and Procedures >> DTC B1405 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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 @ K182 Parking Assist Control Module
  3. Test for infinite resistance between the test points: 8 V Reference circuit terminal 4 & 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. Ignition - On / Vehicle - In Service Mode
  5. Test for less than 1 V between the test points: 8 V Reference circuit terminal 4 & 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 
  6. Ignition/Vehicle & All vehicle systems - Off
  7. Connect all electrical connectors.
  8. Ignition - On / Vehicle - In Service Mode
  9. 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 - 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 
  10. All OK.
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