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Automatic High Beam Switch Circuit [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  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 / Main Body / Data List.
    5. Read the display on the Techstream.
      MAIN BODY

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Auto High Beam Main Switch Auto high beam switch signal/ON or OFF ON: Auto high beam switch pressed
      OFF: Auto high beam switch not pressed      		 -

      OK

      Normal conditions listed above are displayed.

    NG → See step   2 

    OK → See step   5 

  2. INSPECT AUTO HIGH BEAM SWITCH 
    1. Remove the auto high beam switch. Refer to REMOVAL [08/2013 - ] .
    2. Inspect the auto high beam switch. Refer to INSPECTION [08/2013 - ] .

      OK

      Auto high beam switch is normal.

    NG → See step   7 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H7 auto high beam switch connector.
    2. Disconnect the H10 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
      H7-6 (+B) - H10-17 (AHBI) Always Below 1 Ω
      H7-6 (+B) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (AUTO HIGH BEAM SWITCH - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H7-3 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   6 

  5. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2013 - ] 
  6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [08/2013 - ] 
  7. REPLACE AUTO HIGH BEAM SWITCH. Refer to  REMOVAL [08/2013 - ] 
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