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Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control >> Dynamic Radar Cruise Control System >> DTC U0235: Lost Communication with Cruise Control Front Distance Range Sensor >> Inspection Procedure

Inspection Procedure

NOTE:
  • When the distance control ECU is replaced with a new one, initialization must be performed (See INITIALIZATION  ).
  • When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (See ADJUSTMENT  ).
  • As it is possible that this DTC was stored due to a bad connection of a connector, make sure to check that each connector is connected securely.
  1. CHECK HARNESS AND CONNECTOR (MILLIMETER WAVE RADAR SENSOR - DISTANCE CONTROL ECU) 
    1. Disconnect the A44 millimeter wave radar sensor connector.
    2. Disconnect the E86 distance control ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      A44-3 (LRDD) - E86-22 (LRDD) Always Below 1 Ω
      A44-5 (IGB) - E86-13 (IGB)
      E86-22 (LRDD) - Body ground Always 10 kΩ or higher
      E86-13 (IGB) - Body ground
      A44-2 (SGND) - Body ground Always 10 kΩ or higher
      E86-10 (SGND) - Body ground

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying A44 Millimeter Wave Radar Sensor And E86 Distance Control ECU Connectors
    G05760405Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. CHECK DISTANCE CONTROL ECU 
    1. Disconnect the A44 millimeter wave radar sensor connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Switch Condition Specified Condition
      E86-13 (IGB) - E86-10 (SGND) Engine switch on (IG) 11 to 14 V
      E86-22 (LRDD) - E86-10 (SGND) 4.5 to 5.5 V

    NG: REPLACE DISTANCE CONTROL ECU  (See REMOVAL  )

    Fig 2: Identifying E86 Distance Control ECU Connector
    G05760406Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. REPLACE MILLIMETER WAVE RADAR SENSOR 
    1. Replace the millimeter wave radar sensor with a new one (See ADJUSTMENT  ).
    2. Adjust the millimeter wave radar sensor (See ADJUSTMENT  ).
  4. CHECK DTC (DYNAMIC RADAR CRUISE CONTROL SYSTEM) 
    1. Using the Techstream, enter the following menus: Powertrain / Radar Cruise / Trouble Code.
    2. Clear the DTCs (See DTC CHECK/CLEAR  ).
    3. Perform the following to make sure the DTC detection conditions are met.

      HINT:

      If the detection conditions are not met, the system cannot detect the malfunction.

      1. Drive the vehicle at a speed of 40 km/h (25 mph) or more.
      2. Turn the cruise control main switch on.
      3. Push the -SET switch to activate the dynamic radar cruise control.
    4. Check for DTCs (See DTC CHECK/CLEAR  ).

      OK: DTC U0235 is not output. 

    NG: REPLACE DISTANCE CONTROL ECU  (See REMOVAL  )

    OK: END 

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