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Headlight Signal Circuit: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / HL Auto Leveling / Data List.
    5. Read the display on the Techstream.
      HL AUTO LEVELING

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Lo Beam St Low beam headlight state/ON or OFF ON: Low beam headlights on
      OFF: Low beam headlights off      		 -

      OK

      Normal conditions listed above are displayed.

    NG → See step   2 

    OK → See step   3 

  2. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - ECU) 
    1. Disconnect the A48 headlight leveling ECU assembly connector.
      Fig 1: Identifying Headlight Leveling ECU Assembly Connector Terminals
      GTY221503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A48-3 (HDLP) - Body ground Light control switch in head position 11 to 14 V
      Callouts For Fig. 44

      *1 Front view of wire harness connector
      (to Headlight Leveling ECU Assembly)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   4 

  3. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE 
  4. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to  COMPONENTS 
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