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Dimmer Signal Circuit: Procedure

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      L59-26 (DR) - L12-16 (ACAN) Always Below 1 Ω
      L59-26 (DR) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  2. CHECK MAIN BODY ECU (OUTPUT SIGNAL) 
    1. Reconnect the L12 main body ECU connector.
      Fig 1: Identifying Main Body ECU Connector Terminals (Output Signal)
      GTY263861Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the engine switch on (IG).
    3. Turn the light control switch to the TAIL or HEAD position.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      L12-16 (ACAN) - Body ground Automatic light control sensor is covered Above 9 V
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Main Body ECU)

    NG → See step   3 

    OK → See step   4 

  3. GO TO LIGHTING SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
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