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Inspection Procedure

NOTE: First perform the communication function inspections in HOW TO PROCEED WITH TROUBLESHOOTING to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.
  1. PERFORM ACTIVE TEST BY TECHSTREAM (TURN SIGNAL LIGHT) 
    1. Using the Techstream, perform the Active Test.

    Main Body 

    ACTIVE TEST

    Tester Display Test Part Control Range
    Turn Light RH Relay Operation Turn signal light operation OFF - ON
    Turn Light LH Relay Operation Turn signal light operation OFF - ON

    OK: Turn signal light condition is switched by Active Test. 

    NG:  Go to step  4

    OK: Go to next step 

  2. READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH) 
    1. Using the Techstream, read the Data List.

    Combination Switch 

    DATA LIST

    Tester Display Measurement Item/Display Normal Condition
    Turn Right Switch Headlight dimmer switch signal (Turn R position)/ON or OFF ON: Turn signal switch Turn R position
    OFF: Turn signal switch OFF
    Turn Left Switch Headlight dimmer switch signal (Turn L position)/ON or OFF ON: Turn signal switch Turn L position
    OFF: Turn signal switch OFF

    OK: Condition sign can be displayed. 

    NG: REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY  (See HEADLIGHT DIMMER SWITCH )

    OK: Go to next step 

  3. CHECK WINDSHIELD WIPER SWITCH (OPERATION) 
    1. Temporarily replace the windshield wiper switch with a new or normally functioning one (see REMOVAL ).
    2. Check the turn signal light operation.

    OK: Turn signal light operation is normal. 

    NG: REPLACE MAIN BODY ECU 

    OK: END (REPLACE WINDSHIELD WIPER SWITCH)  (See REMOVAL )

  4. CONFIRM LIGHT POSITION 
    1. Check the malfunctioning turn signal light.

    Result 

    RESULT CHART

    Result Proceed To
    All lights do not illuminate A
    Lights on one side do not illuminate B
    Front turn signal light (headlight) C
    Side turn signal light D
    Rear turn signal light (Rear combination light) E

    B:  Go to step  8

    C:  Go to step  10

    D:  Go to step  11

    E:  Go to step  12

    A: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER - BATTERY AND BODY GROUND) 
    1. Disconnect the L1 flasher connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Condition
      L1-7 (E) - Body ground Always Below 1 Ω
      Fig 1: Identifying L1 Flasher Connector
      G04944759Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

    Standard Voltage 

    VOLTAGE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    L1-4 (B) - Body ground Always 11 to 14 V
    L1-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - TURN SIGNAL FLASHER) 
    1. Disconnect the DA ECU connector.
    2. Disconnect the L1 flasher connector.
    3. Measure the resistance according to the value(s) in the table below.

    Standard Resistance 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    DA-55 (TRNL) - L1-5 (EL) Always Below 1 Ω
    DA-56 (TRNR) - L1-6 (ER) Always Below 1 Ω
    DA-55 (TRNL) - Body ground Always 10 kΩ or higher
    DA-56 (TRNR) - Body ground Always 10 kΩ or higher
    Fig 2: Identifying DA ECU Connector And L1 Flasher Connectors
    G05855330Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK TURN SIGNAL FLASHER 
    1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage 

    VOLTAGE SPECIFICATION

    Tester Connection Switch Condition Specified Condition
    L1-2 (LR) - Body ground Headlight dimmer switch (TURN R) ON Pulse generation
    L1-3 (LL) - Body ground Headlight dimmer switch (TURN L) ON Pulse generation
    Fig 3: Identifying Signal Flasher Connector Terminals L1
    G04944761Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE TURN SIGNAL FLASHER ASSEMBLY  (See TURN SIGNAL FLASHER ASSEMBLY )

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (TURN SIGNAL FLASHER - TURN SIGNAL LIGHT) 

  8. READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH) 
    1. Using the Techstream, read the Data List.

    Combination Switch 

    DATA LIST

    Tester Display Measurement Item/Display Normal Condition
    Turn Right Switch Headlight dimmer switch signal (Turn R position)/ON or OFF ON: Turn signal switch Turn R position
    OFF: Turn signal switch OFF
    Turn Left Switch Headlight dimmer switch signal (Turn L position)/ON or OFF ON: Turn signal switch Turn L position
    OFF: Turn signal switch OFF

    OK: Condition sign can be displayed. 

    NG: REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY  (See HEADLIGHT DIMMER SWITCH )

    OK: Go to next step 

  9. CHECK WINDSHIELD WIPER SWITCH (OPERATION) 
    1. Temporarily replace the windshield wiper switch with a new or normally functioning one (see REMOVAL ).
    2. Check the turn signal light operation.

    OK: Turn signal light operation is normal. 

    NG: REPLACE MAIN BODY ECU 

    OK: END (REPLACE WINDSHIELD WIPER SWITCH)  (See REMOVAL )

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT - TURN SIGNAL FLASHER AND BODY GROUND) 
    1. w/o Driver Monitor Camera:
      1. Disconnect the L1 flasher connector.
      2. Disconnect the B3 and B13 light connectors.
      3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance: 

      for LH 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Condition
      L1-3 (LL) - B3-8 (B) Always Below 1 Ω
      B3-3 (E) - Body ground Always Below 1 Ω
      L1-3 (LL) - Body ground Always 10 kΩ or higher

      for RH 

      RESISTANCE SPECIFICATION CHART

      Tester Connection Condition Specified Condition
      L1-2 (LR) - B13-8 (B) Always Below 1 Ω
      B13-3 (E) - Body ground Always Below 1 Ω
      L1-2 (LR) - Body ground Always 10 kΩ or higher
    2. w/ Driver Monitor Camera:
      1. Disconnect the L1 flasher connector.
      2. Disconnect the B1 and B11 light connectors.
      3. Measure the resistance according to the value(s) in the table below.
    Fig 4: Identifying L1 Flasher Connector And B3, B13 Light Connectors
    G04944762Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard Resistance: 

    for LH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    L1-3 (LL) - B1-9 (B) Always Below 1 Ω
    B1-1 (E) - Body ground Always Below 1 Ω
    L1-3 (LL) - Body ground Always 10 kΩ or higher

    for RH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    L1-2 (LR) - B11-9(B) Always Below 1 Ω
    B11-1 (E) - Body ground Always Below 1 Ω
    L1-2 (LR) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE HEADLIGHT ASSEMBLY  (See HEADLIGHT ASSEMBLY )

  11. CHECK HARNESS AND CONNECTOR (SIDE TURN SIGNAL LIGHT - TURN SIGNAL FLASHER AND BODY GROUND) 
    1. Disconnect the L1 flasher connector.
    2. Disconnect the A31 and A48 light connectors.
    3. Measure the resistance according to the value(s) in the table below.

    Standard Resistance: 

    for LH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    L1-3 (LL) - A31-2 Always Below 1 Ω
    A31-1 - Body ground Always 10 kΩ or higher
    L1-3 (LL) - Body ground Always 10 kΩ or higher

    for RH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    L1-2 (LR) - A48-2 Always Below 1 Ω
    A48-1 - Body ground Always 10 kΩ or higher
    L1-2 (LR) - Body ground Always 10 kΩ or higher
    Fig 5: Identifying L1 Flasher Connector And A31 With A48 Light Connectors
    G04944763Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY  (See SIDE TURN SIGNAL LIGHT ASSEMBLY )

  12. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - TURN SIGNAL FLASHER AND BODY GROUND) 
    1. Disconnect the L1 flasher connector.
    2. Disconnect the S51 and S52 light connectors.
    3. Measure the resistance according to the value(s) in the table below.

    Standard Resistance: 

    for LH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    L1-3 (LL) - S51-2 Always Below 1 Ω
    S51-4 - Body ground Always Below 1 Ω
    L1-3 (LL) - Body ground Always 10 kΩ or higher

    for RH 

    RESISTANCE SPECIFICATION CHART

    Tester Connection Condition Specified Condition
    L1-2 (LR) - S52-2 Always Below 1 Ω
    S52-4 - Body ground Always Below 1 Ω
    L1-2 (LR) - Body ground Always 10 kΩ or higher
    Fig 6: Identifying L1 Flasher Connector And S51 With S52 Light Connectors
    G04944764Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE REAR COMBINATION LIGHT ASSEMBLY  (See REAR COMBINATION LIGHT ASSEMBLY )

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