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Turn Signal 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 / Combination Meter / Data List.
    5. Read the display on the Techstream.
      COMBINATION METER

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

      OK

      Normal conditions listed above are displayed.

    NG → See step   2 

    OK → See step   4 

  2. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY 
    1. Remove the headlight dimmer switch assembly. Refer to REMOVAL .
      Fig 1: Inspecting Headlight Dimmer Switch Assembly Connector Terminals
      GTY316666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      12 (TR) - 15 (EL) Turn signal switch in neutral position 10 kΩ or higher
      11 (TL) - 15 (EL) Turn signal switch in neutral position 10 kΩ or higher
      12 (TR) - 15 (EL) Turn signal switch in right turn position Below 1 Ω
      11 (TL) - 15 (EL) Turn signal switch in left turn position Below 1 Ω
      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 (HEADLIGHT DIMMER SWITCH ASSEMBLY - COMBINATION METER ASSEMBLY) 
    1. Disconnect the I17 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      I25-12 (TR) - I17-3 (ER) Always Below 1 Ω
      I25-11 (TL) - I17-4 (EL) Always Below 1 Ω
      I25-15 (EL) - Body ground Always Below 1 Ω
      I17-3 (ER) - Body ground Always 10 kΩ or higher
      I17-4 (EL) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   4 

  4. PROCEED TO NEXT SUSPECTED AREA SHOWN IN  PROBLEM SYMPTOMS TABLE  .
  5. REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY. Refer to  REMOVAL  .
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