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Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus RX 330. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU 
    1. Measure the voltage according to the value (s) in the table below.
      Fig 1: Identifying Headlight Beam Level Control ECU Connector
      G03007538Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      H17-7 (HDLP) - H17-1 (GND) Light Control switch OFF --> HEAD 10 to 14 V --> Below 1 V
    1. NG: Go to step  4 . 
    2. OK: Go to next step. 
  2. INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU 
    1. Measure the voltage according to the value (s) in the table below.
      Fig 2: Identifying Headlight Beam Level Control ECU Terminal Connector
      G03007539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      H17-5 (SPDL) - H17-1 (GND) Drive at about 30 km/h (19 mph) 0 to 14 V Pulse generation ((1))
      H17-6 (SPDR) - H17-1 (GND) Drive at about 30 km/h (19 mph) 0 to 14 V Pulse generation ((1))
      (1) *1: Oscilloscope wave

      HINT:

      • Gauge set: 5 V/DIV. 2 ms/DIV
      • Condition: Drive at about 30 km/h (19 mph)
        Fig 3: Identifying Oscilloscope Wave Graph
        G03007540Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Go to step  5 . 
    2. OK: Go to next step. 
  3. INSPECT HEADLIGHT BEAM LEVEL CONTROL ECU 
    1. Measure the voltage according to the value (s) in the table below.
      Fig 4: Identifying Headlight Beam Level Control ECU Connector
      G03007541Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      H17-8 (CHG-) - H17-1 (GND) Engine is running 10 to 14 V
    1. NG: Go to step  6 . 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  
  4. CHECK HARNESS AND CONNECTOR0NSTRUMENT PANEL JUNCTION BLOCK ASSY - HEADLIGHT BEAM LEVEL) 
    1. Disconnect the 1D connector of instrument panel junction block assy and the H17 connector of headlight beam level control ECU.
    2. Measure the resistance according to the value (s) in the table below.
      Fig 5: Identifying Panel Junction Block Assy Connector
      G03007542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      1D-3 - H17-7 Always Below 1 Ω
      Fig 6: Identifying Instrument Panel Junction Connector
      G03007543Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: Go to FLOW CHART (HEADLIGHT RELAY CIRCUIT) (See  HEADLIGHT RELAY CIRCUIT   ) 
  5. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - HEADLIGHT BEAM LEVEL CONTROL ECU) 
    1. Disconnect the S1 connector of skid control ECU and the H17 connector of headlight beam level control ECU.
    2. Measure the resistance according to the value (s) in the table below.
      Fig 7: Disconnecting S1 Connector Of Skid Control ECU And H17 Connector
      G03007544Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      S1-39 (RRO) - H17-6 (SPDR) Always Below 1 Ω
      S1-40 (RLO) - H17-5 (SPDL) Always Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO FLOW CHART OR  PROBLEM SYMPTOMS TABLE  
  6. CHECK HARNESS AND CONNECTOR (GENERATOR ASSY - HEADLIGHT BEAM LEVEL CONTROL ECU) 
    1. Disconnect the G2 connector generator and the H17 connector of headlight beam level control ECU.
    2. Measure the resistance according to the value (s) in the table below.
      Fig 8: Identifying Generator Assy - Headlight Beam Level Control ECU Connector
      G03007545Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      G2-4 (L) - H17-8 (CHG-) Always Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: REPAIR OR REPLACE GENERATOR ASSY (See  GENERATOR ASSY (3MZ-FE)  ) 
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