DTC    U0235    Lost Communication with Cruise Control Front Distance Range Sensor

for Preparation Click here


DESCRIPTION

The driving support ECU sends information on steering angle and steering direction to the millimeter wave radar sensor. The millimeter wave radar sensor then sends information on the presence, distance, and relative speed of objects ahead to the driving support ECU. The driving support ECU sends this information to the power management control ECU and performs cruise control.

DTC No.
DTC Detection Condition
Trouble Area
U0235
When the power switch is on (IG), a communication error from the millimeter wave radar sensor to the driving support ECU is detected for approx. 1 second.
  1. Communication circuit
  2. Millimeter wave radar sensor
  3. Driving support ECU

WIRING DIAGRAM


B265918E02


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the millimeter wave radar sensor with a new one, make sure to perform Adjust Millimeter Wave Radar Sensor Assembly (Click here).
  2. Confirm that the connector is securely connected, as a partially connected connector is suspected for the cause of this DTC.

1.CHECK HARNESS AND CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR)

  1. Disconnect the driving support ECU and millimeter wave radar sensor connectors.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H5-16 (LRDD) - A2-3 (LRDD)
    		Always
    		Below 1 Ω
    A2-3 (LRDD) - Body ground
    		Always
    		10 kΩ or higher
    H5-16 (LRDD) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the driving support ECU and millimeter wave radar sensor connectors.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (DRIVING SUPPORT ECU - MILLIMETER WAVE RADAR SENSOR)
OK


2.CHECK MILLIMETER WAVE RADAR SENSOR (IGB VOLTAGE)


    E181639E17

  1. Disconnect the millimeter wave radar sensor connector.

  1. Turn the power switch on (IG).

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A2-5 (IGB) - Body ground
    		Power switch on (IG)
    		11 to 14 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Millimeter Wave Radar Sensor)

  1. Reconnect the millimeter wave radar sensor connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGB CIRCUIT)
OK


3.CHECK MILLIMETER WAVE RADAR SENSOR (SGND CIRCUIT)


    E181639E18

  1. Disconnect the millimeter wave radar sensor connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A2-2 (SGND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Millimeter Wave Radar Sensor)

  1. Reconnect the millimeter wave radar sensor connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (SGND CIRCUIT)
OK


4.CHECK MILLIMETER WAVE RADAR SENSOR (LRDD OUTPUT VOLTAGE)

  1. Disconnect the driving support ECU connector.

  1. Turn the power switch on (IG).

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H5-16 (LRDD) - Body ground
    		Power switch on (IG)
    		4.5 to 5.5 V

  1. Reconnect the driving support ECU connector.



NG
REPLACE MILLIMETER WAVE RADAR SENSOR (Click here)
OK


5.REPLACE DRIVING SUPPORT ECU

  1. Replace the driving support ECU (Click here).


NEXT


6.CHECK DTC OUTPUT

  1. Clear the DTCs (Click here).

  1. Turn the cruise control main switch on.

  1. Drive the vehicle at the required speed (45 km/h (28 mph) or higher).

  1. Check if the same DTC is output (Click here).

    Result:
    Result
    		Proceed to
    DTC U0235 is not output
    		A
    DTC U0235 is output
    		B



B
REPLACE MILLIMETER WAVE RADAR SENSOR (Click here)
A

END