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Section 263 (Lighting System - Diagnosis): Pre-Check

WARNING: This page is about a different car, the 2004 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. DATA LIST 

    Combination Switch: 

    Fig 1: Combination Switch Display Values Using Lexus Hand-Held Tester
    G01448859Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Driver Side J/B ECU: 

    Fig 2: Driver Side J/B ECU Display Values Using Lexus Hand-Held Tester
    G01448860Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Passenger Side J/B ECU: 

    Fig 3: Passenger Side J/B ECU Display Values Using Lexus Hand-Held Tester
    G01448861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    luggage Room J/B ECU: 

    Fig 4: Luggage Room J/B ECU Display Values Using Lexus Hand-Held Tester
    G01448862Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Driver Door ECU: 

    Fig 5: Driver Door ECU Display Values Using Lexus Hand-Held Tester
    G01448863Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Passenger Door ECU: 

    Fig 6: Passenger Door ECU Display Values Using Lexus Hand-Held Tester
    G01448864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. ACTIVE TEST 

    Front Lamp ECU (Front Controller): 

    Fig 7: Front Lamp ECU (Front Controller) Display Values Using Lexus Hand-Held Tester
    G01448865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Driver Side J/B ECU: 

    Fig 8: Driver Side J/B ECU Display Values Using Lexus Hand-Held Tester (1 Of 2)
    G01448866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 9: Driver Side J/B ECU Display Values Using Lexus Hand-Held Tester (2 Of 2)
    G01448867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Passenger Side J/B ECU: 

    Fig 10: Passenger Side J/B ECU Display Values Using Lexus Hand-Held Tester
    G01448868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Luggage Room J/B ECU: 

    Fig 11: Luggage Room J/B ECU Display Values Using Lexus Hand-Held Tester
    G01448869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. FAIL-SAFE FUNCTION 
    1. Headlight Leveling Control ECU

      HINT: The Headlight Leveling Control ECU performs the fail-safe when detecting troubles listed in Fig 12. At this it lights the warning Indicator light on the combination meter.

      Fig 12: Trouble Area Table
      G01448870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Recovery condition (The warning light goes off.)

      • Ignition switch OFF
      • Ignition switch OFF or signal lever error cancellation
    2. Light Control ECU
      Fig 13: Light Control ECU Input/Output Troubleshooting Table
      G01448871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. USING HAND-HELD TESTER 
    1. Hook up the hand-held tester to the DLC3.
    2. Monitor the ECU data by following the prompts on the tester screen.

    HINT:

    Hand-held tester has a "Snapshot" function which records the monitored data.

    Please refer to the hand-held tester operator's manual for further details.

  5. DTC CLEAR 
    1. The DTCs and freeze frame data will be erased by either action.
      1. Opening the hand-held tester to erase the codes.
      2. Disconnecting the battery terminals or EFI fuse.
    2. After completing repairs, the DTC retained in memory can be cleared by removing the EFI fuse for 1 minutes or more with the ignition switch OFF.
    3. Check that the normal code is displayed after connecting the fuse.
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