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Inspection Procedure

  1. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - MAIN BODY ECU) 
    1. Disconnect the L59 display connector
    2. Disconnect the L12 ECU connector
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      L59-22 (DR) - L12-16 (ACAN) Always Below 1 Ω
      L59-22 (DR) - Body ground Always 10 kΩ or higher
      Fig 1: Checking Harness And Connector (Multi-Display - Main Body ECU)
      G05783538Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. INSPECT MAIN BODY ECU (OUTPUT SIGNAL) 
    1. Reconnect the L12 ECU connector.
    2. Power switch is ON (IG)
    3. Turn the light control switch to the TAIL or HEAD position
    4. Set the instrument panel light control to less than maximum (to activate the dimmer function that works when the light control switch is in the TAIL position).
    5. Measure the voltage according to the value(s) in the table below.
      Fig 2: Identifying L12 ECU Connector
      G05783539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester connection Condition Specified condition
      L12-16 (ACAN) - Body ground Automatic light control sensor is covered Above 9 V

    NG: GO TO LIGHTING SYSTEM  (See PROBLEM SYMPTOMS TABLE )

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )