DTC    U0235    Lost Communication with Cruise Control Front Distance Range Sensor

for Preparation Click here


DESCRIPTION

The millimeter wave radar sensor assembly and driving support ECU assembly transmit the data for general vehicle control and diagnosis function along the communication line. The millimeter wave radar sensor assembly transmits information about the vehicle in front to the driving support ECU assembly.

DTC No.
DTC Detection Condition
Trouble Area
U0235
The ECM detects a communication error signal (from the millimeter wave radar sensor assembly to the driving support ECU assembly) for 1 second or more while the dynamic radar cruise control is operating
  1. Millimeter wave radar sensor circuit
  2. Millimeter wave radar sensor assembly
  3. Driving support ECU assembly

WIRING DIAGRAM


E222570E02


INSPECTION PROCEDURE

NOTICE:
When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the radar sensor beam axis must be performed (Click here).

1.CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY POWER SOURCE)


    E168714E31

  1. Disconnect the millimeter wave radar sensor assembly 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 Assembly)

  1. Reconnect the millimeter wave radar sensor assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - IG1 RELAY)
OK


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

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

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    H5-16 (LRDD) - A2-3 (LRDD)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    H5-16 (LRDD) or A2-3 (LRDD) - Body ground
    		Always
    		10 kΩ or higher

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



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


3.CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND)


    E168714E34

  1. Disconnect the millimeter wave radar sensor assembly connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		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 Assembly)

  1. Reconnect the millimeter wave radar sensor assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - BODY GROUND)
OK


4.CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY


    E168714E33

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A2-3 (LRDD) - Body ground
    		Power switch on (IG)
    		4.5 to 5.5 V

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



NG
Go to step 5
OK

REPLACE DRIVING SUPPORT ECU ASSEMBLY (Click here)  

5.REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

  1. Replace the millimeter wave radar sensor assembly (Click here).

  1. Adjust the millimeter wave radar sensor assembly (Click here).


NEXT


6.CHECK WHETHER DTC OUTPUT RECURS (DTC U0235)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Clear the DTCs (Click here).

  1. Perform the following to make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the malfunction cannot be detected.

    1. Drive the vehicle at a speed of 50 km/h (30 mph) and 170 km/h (105 mph).

    2. Turn the cruise control switch (ON-OFF button) on.

    3. Push the -/SET switch to activate the cruise control.

  1. Enter the following menus: Powertrain / Radar Cruise / DTC.

  1. Read the DTCs.

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



B
REPLACE DRIVING SUPPORT ECU ASSEMBLY (Click here)
A

END