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Headlight Dimmer Switch Circuit: 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: Body Electrical / Main Body / Data List.
    5. Read the display on the Techstream.
      MAIN BODY

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Dimmer SW Dimmer switch high position signal/ON or OFF ON: Dimmer switch in high or high flash position
      OFF: Dimmer switch in low position      		 -
      Passing Light SW Dimmer switch high flash position (pass) signal/ON or OFF ON: Dimmer switch in high flash position
      OFF: Dimmer switch not in high flash position      		 -
      Front Fog Light SW Front fog light switch signal/ON or OFF ON: Front fog light switch on
      OFF: Front fog light switch off      		 -
      Auto Light SW Light control switch AUTO position signal/ON or OFF ON: Light control switch in AUTO position
      OFF: Light control switch not in AUTO position      		 -
      Head Light SW (Head) Light control switch head position signal/ON or OFF ON: Light control switch in head position
      OFF: Light control switch not in head position      		 -
      Head Light SW (Tail) Light control switch tail position signal/ON or OFF ON: Light control switch in tail or head position
      OFF: Light control switch in neither tail nor head position      		 -

      OK

      Normal conditions listed above are displayed.

    NG → See step   2 

    OK → See step   4 

  2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY 

    HINT: 

    Inspect the items that did not change as a result of monitoring the Data List.

    1. Remove the headlight dimmer switch assembly. Refer to REMOVAL .
      Fig 1: Inspecting Headlight Dimmer Switch Assembly Connector Terminals
      GTY316659Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      LIGHT CONTROL SWITCH (W/ DRL OFF FUNCTION)

      Tester Connection Switch Condition Specified Condition
      15 (EL) - 18 (T) Light control switch off
      (DRL OFF position)      		 10 kΩ or higher
      18 (T) - 20 (A) Light control switch off
      (DRL OFF position)      		 10 kΩ or higher
      20 (A) - 19 (H) Light control switch off
      (DRL OFF position)      		 10 kΩ or higher
      15 (EL) - 18 (T) Light control switch in tail position Below 1 Ω
      15 (EL) - 18 (T) Light control switch in head position Below 1 Ω
      18 (T) - 19 (H) Light control switch in head position Below 1 Ω
      15 (EL) - 20 (A) Light control switch in AUTO position Below 1 Ω
      LIGHT CONTROL SWITCH (W/O DRL OFF FUNCTION)

      Tester Connection Switch Condition Specified Condition
      15 (EL) - 18 (T) Light control switch off 10 kΩ or higher
      18 (T) - 20 (A) Light control switch off 10 kΩ or higher
      20 (A) - 19 (H) Light control switch off 10 kΩ or higher
      15 (EL) - 18 (T) Light control switch in tail position Below 1 Ω
      15 (EL) - 18 (T) Light control switch in head position Below 1 Ω
      18 (T) - 19 (H) Light control switch in head position Below 1 Ω
      15 (EL) - 20 (A) Light control switch in AUTO position Below 1 Ω
      DIMMER SWITCH

      Tester Connection Switch Condition Specified Condition
      14 (HU) - 15 (EL) Dimmer switch in low position 10 kΩ or higher
      14 (HU) - 15 (EL) Dimmer switch in high position Below 1 Ω
      15 (EL) - 17 (HF) Dimmer switch in high flash position Below 1 Ω
      FRONT FOG LIGHT SWITCH*1

      Tester Connection Switch Condition Specified Condition
      8 (LFG) - 9 (BFG) Fog light switch off 10 kΩ or higher
      8 (LFG) - 9 (BFG) Fog light switch on Below 1 Ω

      *1: w/ Front Fog Light

      OK

      Headlight dimmer switch assembly is normal.

      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Headlight Dimmer Switch Assembly)

    NG → See step   5 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT DIMMER SWITCH ASSEMBLY) 
    1. Disconnect the I13 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I25-9 (BFG) - I13-27 (FFOG) Always Below 1 Ω
      I25-14 (HU) - I13-5 (HU) Always Below 1 Ω
      I25-17 (HF) - I13-8 (HF) Always Below 1 Ω
      I25-18 (T) - I13-30 (TAIL) Always Below 1 Ω
      I25-19 (H) - I13-29 (HEAD) Always Below 1 Ω
      I25-20 (A) - I13-28 (A) Always Below 1 Ω
      I25-9 (BFG) - Body ground Always 10 kΩ or higher
      I25-14 (HU) - Body ground Always 10 kΩ or higher
      I25-17 (HF) - Body ground Always 10 kΩ or higher
      I25-18 (T) - Body ground Always 10 kΩ or higher
      I25-19 (H) - Body ground Always 10 kΩ or higher
      I25-20 (A) - Body ground Always 10 kΩ or higher
      I25-15 (EL) - Body ground Always Below 1 Ω
      I25-8 (LFG) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   6 

  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN  PROBLEM SYMPTOMS TABLE  .
  5. REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY. Refer to  REMOVAL  .
  6. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL  .
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