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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK TURN SIGNAL LIGHT (OPERATION) 
    1. Turn the engine switch on (IG)
    2. When the turn signal light switch is operated, check that the corresponding turn signal lights flash

      HINT:

      The front and rear turn signal lights share the same drive circuit. Therefore, if either the front or rear turn signal lights do not come on, there may be a problem in the circuit between the turn signal flasher and a bulb, or the circuit between a bulb and body ground

      Result 

      RESULT REFERENCE

      Result Proceed to
      Neither left nor right turn signal lights flash A
      Left turn signal lights do not flash B
      Right turn signal lights do not flash C

    B: Go to step  6

    C: Go to step  11

    A: Go to next Step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG)
    3. Turn the Techstream on
    4. Enter the following menus. Body Electrical / Body No. 3 / Active Test.
    5. Check the operation

      Body No. 3 (Main Body ECU LH) 

      ACTIVE TEST - BODY NO. 3 (MAIN BODY ECU LH)

      Tester Display Test Part Control Range Diagnostic Note
      Turn Light RH RH side turn signal lights ON/OFF -
      Turn Light LH LH side turn signal lights ON/OFF -

      OK: Turn signal lights flash. 

    NG: Go to step 3 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

  3. INSPECT FUSE (LH-IG, TURN-HAZ) 
    1. Remove the LH-IG fuse from the cowl side junction block LH.
    2. Remove the TURN-HAZ fuse from the No 1 engine room junction block.
    3. Measure the resistance of the fuses

      Standard Resistance: 

      Below 1 Ω 

    NG: REPLACE FUSE 

    OK: Go to next Step 

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE) 
    1. Disconnect the J30 flasher assembly connector
    2. Measure the resistance according to the value (s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      J30-7 (E) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value (s) in the table below

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      J30-4 (B) - Body ground Always 11 to 14 V
      J30-1 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      4. Fig 1: Identifying J30 Flasher Assembly Connector
      G05756438Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  5. REPLACE TURN SIGNAL FLASHER ASSEMBLY 
    1. Temporarily replace the turn signal flasher assembly with a new or known good one (See TURN SIGNAL FLASHER ASSEMBLY  )
    2. Check that the turn signal lights flash

      OK: Turn signal lights flash. 

    NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

    OK: END 

  6. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus Body Electrical / Body No. 3 / Active Test
    5. Check the operation

      Body No. 3 (Main Body ECU LH) 

      ACTIVE TEST - BODY NO. 3 (MAIN BODY ECU LH)

      Tester Display Test Part Control Range Diagnostic Note
      Turn Light LH LH side turn signal lights ON/OFF -

      OK: Turn signal lights flash. 

    NG: Go to step 7 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

  7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BODY GROUND) 
    1. Disconnect the LA main body ECU LH connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      LA-16 (TL) - Body ground Always 11 to 14 V

    NG: Go to step  10

    Fig 2: Identifying LA Main Body ECU LH Connector
    G05756439Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next Step 

  8. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER ASSEMBLY HEADLIGHT) 
    1. Disconnect the J30 flasher assembly connector
    2. Disconnect the B12 headlight assembly connector.
    3. Measure the resistance according to the value (s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      J30-3 (LL) - B12-9 Always Below 1 Ω
      J30-3 (LL) - Body ground Always 10 kΩ or higher
      4. Fig 3: Identifying J30 Flasher Assembly Connector
      G05756440Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  9. REPLACE TURN SIGNAL FLASHER ASSEMBLY 
    1. Temporarily replace the turn signal flasher assembly with a new or known good one (See TURN SIGNAL FLASHER ASSEMBLY  ).
    2. Check that the turn signal lights flash

      OK: Turn signal lights flash. 

    NG: REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH) 

    OK: END 

  10. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - TURN SIGNAL FLASHER ASSEMBLY) 
    1. Disconnect the LA main body ECU LH connector.
    2. Disconnect the J30 flasher connector
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      LA-16 (TL) - J30-5 (EL) Always Below 1 Ω
      LA-16 (TL) - Body ground Always 10 kΩ or higher
      4. Fig 4: Identifying J30 Flasher Connector
      G05756441Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

  11. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Body No. 3 / Active Test
    5. Check the operation

      Body No. 3 (Main Body ECU LH) 

      ACTIVE TEST - BODY NO. 3 (MAIN BODY ECU LH)

      Tester Display Test Part Control Range Diagnostic Note
      Turn Light RH RH side turn signal lights ON/OFF -

      OK: Turn signal lights flash. 

    NG: Go to step 12 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE  (See PROBLEM SYMPTOMS TABLE  )

  12. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - BODY GROUND) 
    1. Disconnect the LA main body ECU LH connector
    2. Measure the voltage according to the value (s) in the table below

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      LA-15 (TR) - Body ground Always 11 to 14 V
      3. Fig 5: Identifying LA Main Body ECU LH Connector Terminal
      G05756442Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  15

    OK: Go to next Step 

  13. CHECK HARNESS AND CONNECTOR (TURN SIGNAL FLASHER ASSEMBLY HEADLIGHT) 
    1. Disconnect the J30 turn signal flasher assembly connector
    2. Disconnect the B2 headlight assembly connector
    3. Measure the resistance according to the value (s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      J30-2 (LR) - B2-9 Always Below 1 Ω
      J30-2 (LR) - Body ground Always 10 kΩ or higher
      4. Fig 6: Identifying J30 Turn Signal Flasher Assembly Connector And B2 Headlight Assembly Connector
      G05756443Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  14. REPLACE TURN SIGNAL FLASHER ASSEMBLY 
    1. Temporarily replace the turn signal flasher assembly with a new or known good one (See TURN SIGNAL FLASHER ASSEMBLY  )
    2. Check that the turn signal lights flash.

      OK: Turn signal lights flash. 

    NG: REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH) 

    OK: END 

  15. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - TURN SIGNAL FLASHER ASSEMBLY) 
    1. Disconnect the LA main body ECU LH connector.
    2. Disconnect the J30 turn signal flasher assembly connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      LA-15 (TR) - J30-6 (ER) Always Below 1 Ω
      LA-15 (TR) - Body ground Always 10 kΩ or higher
      4. Fig 7: Identifying J30 Turn Signal Flasher Assembly Connector
      G05756444Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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