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Home › Lexus › 2004 › RX 330 AWD › Repair and Diagnosis › External Pages › Different car › Section 522 (Cruise Control) › Dynamic Laser Cruise Control System › DTC U1102: Lost Communication with Radar Sensor › Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • When the distance control ECU is replaced with a new one, initialization must be performed (See ADJUSTMENT  ).
  • When the laser sensor is replaced with a new one, adjustment of the laser sensor beam axis must be performed (See ADJUSTMENT  ).
  1. CHECK HARNESS AND CONNECTOR (DISTANCE CONTROL ECU - LASER SENSOR) 
    1. Disconnect the distance control ECU connector and laser sensor connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

      Tester Connection Condition Specified Condition
      D2-23 (LRRD) - L1-4 (LRRD) Always Below 1 Ω
      D2-13 (IGB) - L1-5 (IGB) Always Below 1 Ω,
      D2-23 (LRRD) - Body ground Always 10 kΩ or higher
      D2-13 (IGB) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 1: Identifying D2 ECU & L1 Connector Terminals
    G05273673Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  2. CHECK DISTANCE CONTROL ECU 
    1. Reconnect the distance control ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

      Tester Connection Condition Specified Condition
      D2-13 (IGB) - Body ground Ignition switch on 10 to 14 V
      Fig 2: Identifying D2 IGB Connector Terminals
      G05273674Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE DISTANCE CONTROL ECU 

    OK: Go to Next Step 

  3. CHECK LASER SENSOR 
    1. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

      Tester Connection Condition Specified Condition
      L1-5 (IGB) - Body ground Ignition switch on 10 to 14 V
      Fig 3: Identifying L1 IGB & LRRD Connector Terminals
      G05273675Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the signal waveform between terminal LRRD (B9-4) of the laser sensor and body ground.

      OK: 

      A waveform similar to that is output. 

      HINT:

      • Gauge set: 2 V/DIV., 5 ms./DIV.
      • Condition: Ignition switch on
        • Fig 4: Identifying Signal Waveform Graph
        G05140631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE LASER SENSOR 

    OK: END (INTERMITTENT PROBLEM IS PRESENT) 

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