DTC B1405 (UD5)
Diagnostic InstructionsDTC Descriptor
DTC B1405

Control Module Voltage Reference Output 2 Circuit

Symptom Byte Information:Symptom Byte List

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Reference Voltage—Terminal 4 X2@K182 Parking Assist Control Module

B1405 02

B0954 06, B0955 06, B0956 06, B0957 06, B0958 06, B0959 06, B0960 06, B0961 06

B1405 07

—

Reference Voltage—Terminal 1 X3@K182 Parking Assist Control Module

B1405 02

B0954 06, B0955 06, B0956 06, B0957 06, B0958 06, B0959 06, B0960 06, B0961 06

B1405 07

—

Circuit/System Description

For an overview of the component/system, refer to:Parking Assist Description and Operation

Circuit

Description

Reference Voltage

Regulated voltage supplied by the control module.

Signal

The control module input circuit has an internal resistance connected to 9 V.

Low Reference

Grounded through the control module.

Component

Description

K182 Parking Assist Control Module

The assembly has several functions:

  • Front Parking Assist
  • Rear Parking Assist

B306 Parking Assist Sensor

The sensors can send and receive ultrasonic sounds. First a short sound is emitted. If there is an obstacle in front of the sensor, the obstacle will reflect the sound back to the sensor. The time difference between sending and receiving is the measure for the distance to the obstacle.

Conditions for Running the DTC
  • Ignition On
  • Parking Assist System Status=Enabled
Conditions for Running the DTC

Ignition=On

Conditions for Setting the DTCB1405 02

9 V Reference circuit=Short to Ground

B1405 03

9 V Reference circuit=Low Voltage

B1405 07

9 V Reference circuit=Short to Voltage

Actions Taken When the DTC Sets

Parking Assist=Disabled

Conditions for Clearing the DTC

The conditions for setting the DTC no longer exist.

Reference Information

Schematic Reference

Parking Assistance Systems Schematics

Connector End View Reference

Master Electrical Component List

Electrical Information ReferenceScan Tool Reference

Control Module References

Circuit/System Testing
  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:Reference VoltageCircuit terminal 4 X2&Ground
    • If less than infinite resistance
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:B306 Parking Assist Sensor—All
    3. Test for infinite resistance between the test points:Reference VoltageCircuit terminal 4 X2@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
    • If infinite resistance
  4. Test for infinite resistance between the test points:Reference VoltageCircuit terminal 1 X3&Ground
    • If less than infinite resistance
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:B306 Parking Assist Sensor—All
    3. Test for infinite resistance between the test points:Reference VoltageCircuit terminal 1 X3@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
    • If infinite resistance
  5. Ignition » On / Vehicle » In Service Mode
  6. Test for less than 1 V between the test points:Reference VoltageCircuit terminal 4 X2&Ground
    • If greater than 1 V
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:B306 Parking Assist Sensor—All
    3. Test for less than 1 V between the test points:Reference VoltageCircuit terminal 4 X2@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
    • If less than 1 V
  7. Test for less than 1 V between the test points:Reference VoltageCircuit terminal 1 X3&Ground
    • If greater than 1 V
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:B306 Parking Assist Sensor—All
    3. Test for less than 1 V between the test points:Reference VoltageCircuit terminal 1 X3@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
    • 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
    3. Ignition » On / Vehicle » In Service Mode
    4. Verify DTC B1405 is not set
      • If the DTC is set

        Replace the component:K182 Parking Assist Control Module

      • 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 has failed in the test.
      • If the DTC is not set
    6. All OK.
    • If the DTC is not set
  12. All OK.
Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification