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Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OPERATION OF TURN SIGNAL LIGHT 
    1. When the turn signal light switch is operated, check that the appropriate turn signal light flashes.

      Result 

      RESULT CHART

      Condition Proceed To
      No lights flash A
      Front turn signal light (LH or RH) does not flash B
      Side turn signal light (LH or RH) does not flash (Hatchback) C
      Rear turn signal light (LH or RH) does not flash D

    B: Go to step  6

    C: Go to step  8

    D: Go to step  10

    A: GO TO NEXT STEP 

  2. INSPECT FUSE (GAUGE, HAZ) 
    1. Remove the GAUGE fuse from the main body ECU.
    2. Remove the HAZ fuse from the engine room relay block.
    3. Measure the resistance.

      Standard resistance: Below 1 Ω 

    4. Reinstall the GAUGE and HAZ fuses.

    NG: REPLACE FUSE 

    OK: GO TO NEXT STEP 

  3. CHECK HARNESS AND CONNECTOR (FUSE - MAIN BODY ECU) 
    1. Disconnect the 4B main body ECU connector.
    2. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      4B-32 - Body ground Always 11 to 14 V
    3. Reconnect the main body ECU connector.
      4. Fig 1: Identifying Terminals Of 4B Main Body ECU Connector
      G04832688Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: GO TO NEXT STEP 

  4. INSPECT HEADLIGHT DIMMER SWITCH 
    1. Remove the headlight dimmer switch.
    2. Inspect the turn signal switch.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      6(TR)-7(E) Right Below 1 Ω
      6(TR)-7(E) Neutral 10 kΩ or higher
      5(TL)-7(E) Left Below 1 Ω
      5(TL)-7(E) Neutral 10 kΩ or higher
    4. Reinstall the headlight dimmer switch.
      5. Fig 2: Identifying Terminals Of Headlight Dimmer Switch Connector
      G04832689Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE HEADLIGHT DIMMER SWITCH 

    OK: GO TO NEXT STEP 

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU) 
    1. Disconnect the D4 headlight dimmer switch connector.
    2. Disconnect the 4S and 4E and main body ECU connectors.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      D4-5(TL)-4S-11(EL) Below 1 Ω
      D4-6(TR)-4S-12(ER) Below 1 Ω
      D4-7 (E) - 4E-28 (GND) Below 1 Ω
      D4-S (TL) or 4S-11 (EL) Body ground 10 kΩ or higher
      D4-6 (TR) or 4S-12 (ER) - Body ground 10 kΩ or higher
      D4-7 (E) or 4E-28 (GND) - Body ground 10 kΩ or higher
    4. Reconnect the headlight dimmer switch connector.
    5. Reconnect the main body ECU connectors.
      6. Fig 3: Identifying Terminals Of 4B Main Body ECU Connector
      G04832690Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU 

  6. INSPECT BULB (FRONT TURN SIGNAL LIGHT BULB) 
    1. Hatchback:
      1. Remove the front turn signal light.
      2. Apply battery voltage to the terminals and check that the front turn signal light illuminates.
      3. Reinstall the front turn signal light.

        Standard 

        TERMINALS VOLTAGES CHART

        Measurement Condition Standard
        Positive battery - Terminal 1
        Negative battery - Terminal 2        		 Front turn signal light Illuminates
        Fig 4: Identifying Terminals Of Front Turn Signal Light Connector
        G04832691Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Sedan:
      1. Remove the front turn signal light.
      2. Apply battery voltage to the terminals and check that the front turn signal light illuminates.
      3. Reinstall the front turn signal light.

        Standard 

        TERMINALS VOLTAGES CHART

        Measurement Condition Standard
        Positive battery - Terminal 1
        Negative battery - Terminal 2        		 Front turn signal light Illuminates
      3. Fig 5: Identifying Terminals Of Front Turn Signal Light Connector
      G04832692Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE BULB 

    OK: GO TO NEXT STEP 

  7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - FRONT TURN SIGNAL LIGHT) 
    1. Hatchback:
      1. Disconnect the B1 and B8 front turn signal light connectors.
      2. Disconnect the 4B main body ECU connector.
      3. Measure the resistance.

        Standard resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        4B-31 (LR)-B1-1 Below 1 Ω
        4B-14 (LL) - B8-1 Below 1 Ω
        4B-31 (LR) or B1-1 - Body ground 10 kΩ or higher
        4B-14 (LL) or B8-1 - Body ground 10 kΩ or higher
      4. Reconnect the front turn signal light connectors.
      5. Reconnect the main body ECU connector.
        Fig 6: Identifying Terminals Of 4B Main Body ECU Connector
        G04832693Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Sedan:
      1. Disconnect the B14 and B15 front turn signal light (Headlight assembly) connectors.
      2. Disconnect the 4B main body ECU connector.
      3. Measure the resistance.

        Standard resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        4B-31 (LR) - B14-1 Below 1 Ω
        4B-14(LL)-B15-1 Below 1 Ω
        4B-31 (LR) or B14-1 - Body ground 10 kΩ or higher
        4B-14 (LL) or B1S-1 - Body ground 10 kΩ or higher
      4. Reconnect the front turn signal light connectors.
      5. Reconnect the main body ECU connector.
        6. Fig 7: Identifying Terminals Of 4B Main Body ECU Connector
        G04832694Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT TURN SIGNAL LIGHT - BODY GROUND) 

  8. INSPECT BULB (SIDE TURN SIGNAL LIGHT BULB) 
    1. Remove the side turn signal light assembly.
    2. Apply battery voltage to the terminals and check that the side turn signal light illuminates.

      Standard 

      TERMINALS VOLTAGES CHART

      Measurement Condition Standard
      Positive battery - Terminal 1
      Negative battery - Terminal 2      		 Side turn signal light Illuminates
    3. Reinstall the side turn signal light assembly.
      4. Fig 8: Identifying Terminals Of Side Turn Signal Light Assembly Connector
      G04832695Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE BULB 

    OK: GO TO NEXT STEP 

  9. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SIDE TURN SIGNAL LIGHT ASSEMBLY) 
    1. Disconnect the A1 and A2 side turn signal light assembly connectors.
    2. Disconnect the 4B main body ECU connector.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      4B-31 (LR)-AM Below 1 Ω
      4B-14(LL)-A2-1 Below 1 Ω
      4B-31 (LR) or A1-1 - Body ground 10 kΩ or higher
      4B-14 (LL) or A2-1 - Body ground 10 kΩ or higher
    4. Reconnect the side turn signal light assembly connectors.
    5. Reconnect the main body ECU connector.
      6. Fig 9: Identifying Terminals Of 4B Main Body ECU Connector
      G04832696Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (SIDE TURN SIGNAL LIGHT ASSEMBLY - BODY GROUND) 

  10. INSPECT BULB (REAR TURN SIGNAL LIGHT BULB) 
    1. Hatchback:
      1. Remove the rear combination light assembly.
      2. Apply battery voltage to the terminals and check that the rear turn signal light illuminates.

        Standard 

        TERMINALS VOLTAGES CHART

        Measurement Condition Standard
        Positive battery - Terminal 3
        Negative battery - Terminal 6        		 Rear turn signal light illuminates
      3. Reinstall the rear combination light assembly.
        Fig 10: Identifying Terminals Of Rear Combination Light Assembly Connector
        G04832697Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Sedan:
      1. Remove the rear combination light assembly.
      2. Apply battery voltage to the terminals and check that the rear turn signal light illuminates.

        Standard 

        TERMINALS VOLTAGES CHART

        Measurement Condition Standard
        Positive battery - Terminal 2
        Negative battery - Terminal 6        		 Rear turn signal light illuminates
      3. Reinstall the rear combination light assembly.
      3. Fig 11: Identifying Terminals Of Rear Combination Light Assembly Connector
      G04832698Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE BULB 

    OK: GO TO NEXT STEP 

  11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - REAR TURN SIGNAL LIGHT) 
    1. Hatchback:
      1. Disconnect the J3 and J4 rear combination light assembly connectors.
      2. Disconnect the 4A main body ECU connector.
      3. Measure the resistance.

        Standard resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        4A-28(LR)-J3-3 Below 1 Ω
        4B-27 (LL) - J4-3 Below 1 Ω
        4A-28 (LR) or J3-3 - Body ground 10 kΩ or higher
        4A-27 (LL) or J4-3 - Body ground 10 kΩ or higher
      4. Reconnect the rear combination light assembly connectors.
      5. Reconnect the main body ECU connector.
        Fig 12: Identifying Terminals Of Rear Combination Light Assembly Connector
        G04832699Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Sedan:
      1. Disconnect the J34 and J35 rear combination light assembly connectors.
      2. Disconnect the 4A main body ECU connector.
      3. Measure the resistance.

        Standard resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

        Tester Connection Specified Condition
        4A-28 (LR) - J34-2 Below 1 Ω
        4B-27 (LL) - J35-2 Below 1 Ω
        4A-28 (LR) or J34-2 - Body ground 10 kΩ or higher
        4A-27 (LL) or J35-2 Body ground 10 kΩ or higher
      4. Reconnect the rear combination light assembly connectors.
      5. Reconnect the main body ECU connector.
        6. Fig 13: Identifying Terminals Of Rear Combination Light Assembly Connector
        G04832700Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR TURN SIGNAL LIGHT - BODY GROUND) 

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