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Headlight Dimmer Switch Circuit [07/2014 - ]: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus:
      1. for Main Body ECU: Body Electrical / Main Body / Data List.
      2. for Combination Meter: Body Electrical / Combination Meter / Data List.
    5. According to the display on the Techstream, read the Data List.
      MAIN BODY

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Dimmer SW Dimmer switch high signal /
      OFF or ON      		 OFF: Dimmer switch in low position
      ON: Dimmer switch in high or high flash position      		 -
      Passing Light SW Dimmer switch high flash signal /
      OFF or ON      		 OFF: Dimmer switch not in high flash position
      ON: Dimmer switch in high flash position      		 -
      Front Fog Light SW*1 Fog light switch signal /
      OFF or ON      		 OFF: Fog light switch off
      ON: Fog light switch on      		 -
      Auto Light SW*2 Light control switch DRL signal /
      OFF or ON      		 OFF: Light control switch not in DRL position
      ON: Light control switch in DRL position      		 -
      Head Light SW (Head) Light control switch HEAD signal /
      OFF or ON      		 OFF: Light control switch not in HEAD position
      ON: Light control switch in HEAD position      		 -
      Head Light SW (Tail) Light control switch TAIL signal /
      OFF or ON      		 OFF: Light control switch not in TAIL and HEAD position
      ON: Light control switch in TAIL or HEAD position      		 -
      • *1: w/ Fog Light
      • *2: w/ DRL OFF function
      COMBINATION METER

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Turn Signal Switch (Right) Turn signal switch signal (turn right) /
      OFF or ON      		 OFF: Turn signal switch right off (turn right)
      ON: Turn signal switch right on (turn right)      		 -
      Turn Signal Switch (Left) Turn signal switch signal (turn left) /
      OFF or ON      		 OFF: Turn signal switch left off (turn left)
      ON: Turn signal switch left on (turn left)      		 -

      OK

      Normal conditions listed above are displayed.

      RESULT

      Result Proceed to
      OK A
      NG (Light control switch, dimmer switch or fog light switch*1) B
      NG (Turn signal switch) C
      • *1: w/ Fog Light

    B → See step   2 

    C → See step   4 

    A → See step   6 

  2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY (LIGHT CONTROL SWITCH, DIMMER SWITCH OR FOG LIGHT SWITCH) 
    1. Inspect the headlight dimmer switch assembly. Refer to INSPECTION [07/2014 - ] .

    NG → See step   7 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the D106 headlight dimmer switch assembly connector.
    2. Disconnect the D143 main body ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D106-4 (BFG) - D143-27 (FFOG)*1 Always Below 1 Ω
      D106-11 (HU) - D143-5 (HU) Always Below 1 Ω
      D106-17 (HF) - D143-8 (HF) Always Below 1 Ω
      D106-18 (T) - D143-30 (TAIL) Always Below 1 Ω
      D106-19 (A) - D143-28 (A)*2 Always Below 1 Ω
      D106-20 (H) - D143-29 (HEAD) Always Below 1 Ω
      D106-3 (LFG) - Body ground Always Below 1 Ω
      D106-12 (EL) - Body ground Always Below 1 Ω
      D106-4 (BFG) or D143-27 (FFOG) - Body ground*1 Always 10 kΩ or higher
      D106-11 (HU) or D143-5 (HU) - Body ground Always 10 kΩ or higher
      D106-17 (HF) or D143-8 (HF) - Body ground Always 10 kΩ or higher
      D106-18 (T) or D143-30 (TAIL) - Body ground Always 10 kΩ or higher
      D106-19 (A) or D143-28 (A) - Body ground*2 Always 10 kΩ or higher
      D106-20 (H) or D143-29 (HEAD) - Body ground Always 10 kΩ or higher
      • *1: w/ Fog Light
      • *2: w/ DRL OFF function

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   8 

  4. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY (TURN SIGNAL SWITCH) 
    1. Inspect the headlight dimmer switch assembly. Refer to INSPECTION [07/2014 - ] .

    NG → See step   7 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the D106 headlight dimmer switch assembly connector.
    2. Disconnect the D101 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D106-13 (TR) - D101-9 (ER) Always Below 1 Ω
      D106-15 (TL) - D101-10 (EL) Always Below 1 Ω
      D106-12 (EL) - Body ground Always Below 1 Ω
      D106-13 (TR) or D101-9 (ER) - Body ground Always 10 kΩ or higher
      D106-15 (TL) or D101-10 (EL) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   9 

  6. PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [07/2014 - ]  
  7. REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY. Refer to  REMOVAL [07/2014 - ] 
  8. REPLACE MAIN BODY ECU. Refer to  REMOVAL [07/2014 - ] 
  9. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2014 - ] 
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