LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Lighting (Exterior)) >> Lighting System >> Taillight Circuit >> Inspection Procedure

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 TAILLIGHT (OPERATION) 
    1. Turn the engine switch on (IG)
    2. When the taillight switch is operated, check that the following lights illuminate

      HINT

      • The front lights (front side marker lights and parking lights) share the same drive circuit. Therefore, if one of the front lights does not come on, there may be a problem in the circuit between the FR TAIL relay and bulb, or the circuit between the bulb and body ground. Inspect those circuits to identify the problem.
      • The rear lights (taillights, license plate lights, and side marker lights) share the same drive circuit Therefore, if one of the rear lights does not come on, there may be a problem in the circuit between the TAIL relay and the bulb or LED, or the circuit between the bulb or LED and body ground. Inspect those circuits to identify the problem

        Result 

        RESULT REFERENCE

        Result Proceed to
        Neither front nor rear lights illuminate A
        Front lights (front side marker lights and parking lights) do not illuminate B
        Rear lights (taillights, license plate lights, and side marker lights) do not illuminate C

    B: Go to step 2 

    C: Go to step  6

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

  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 5 / Active Test
    5. Check the operation.

      Body No. 5 (Front Controller) 

      ACTIVE TEST - BODY NO. 5 (FRONT CONTROLLER)

      Tester Display Test Part Control Range Diagnostic Note
      Clearance Light Operation Clearance light (Front side marker lights and parking lights) ON / OFF -

      OK: Front side marker lights and parking lights illuminate. 

    NG: Go to step 3 

    OK: REPLACE FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU) 

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND) 

    HINT

    Perform the following inspection on either the LH or RH side

    1. Disconnect the B2 or B12 headlight assembly connector
    2. Measure the resistance according to the value (s) in the table below

      Standard Resistance: 

      RH side 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      B2-5 (E) - Body ground Always Below 1 Ω
      B2-8 (E) - Body ground Always Below 1 Ω

      RH side 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      B12-5 (E) - Body ground Always Below 1 Ω
      B12-8 (E) - Body ground Always Below 1 Ω
      3. Fig 1: Identifying B2 Or B12 Headlight Assembly Connector
      G05756447Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER) 

    HINT

    Perform the following inspection on either the LH or RH side

    1. Disconnect the B2 or B12 headlight assembly connector
    2. Measure the voltage according to the value (s) in the table below.

      Standard Voltage: 

      RH Side 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      B2-6 (B) - Body ground Light control switch off Below 1 V
      B2-6 (B) - Body ground Light control switch in TAIL 11 to 14 V
      B2-7 (B) - Body ground Light control switch off Below 1 V
      B2-7 (B) - Body ground Light control switch in TAIL 11 to 14 V
      Fig 2: Identifying B2 Or B12 Headlight Assembly Connector
      G05756448Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      LH Side 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      B12-6 (B) - Body ground Light control switch off Below 1 V
      B12-6 (B) - Body ground Light control switch in TAIL 11 to 14 V
      B12-7 (B) - Body ground Light control switch off Below 1 V
      B12-7 (B) - Body ground Light control switch in TAIL 11 to 14 V

    NG: Go to step 5 

    OK: REPLACE HEADLIGHT ASSEMBLY  (See HEADLIGHT ASSEMBLY  )

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER) 

    HINT

    Perform the following inspection on either the LH or RH side.

    1. Disconnect the B2 or B12 headlight assembly connector.
    2. Disconnect the 2G front controller connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance: 

      RH Side 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      B2-6 (B) - 2G-10 Always Below 1 Ω
      B2-6 (B) - Body ground Always 10 kΩ or higher
      B2-7 (B) - 2G-8 Always Below 1 Ω
      B2-7 (B) - Body ground Always 10 kΩ or higher

      LH Side 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      B12-6 (B) - 2G-11 Always Below 1 Ω
      B12-6 (B) - Body ground Always 10 kΩ or higher
      B12-7 (B) - 2G-9 Always Below 1 Ω
      B12-7 (B) - Body ground Always 10 kΩ or higher
      4. Fig 3: Identifying B2 Or B12 Headlight Assembly Connector And 2G Front Controller Connector
      G05756449Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU) 

  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 / Active Test.
    5. Check the operation

      Body (Main Body ECU RH) 

      ACTIVE TEST - BODY (MAIN BODY ECU RH)

      Tester Display Test Part Control Range Diagnostic Note
      Tail Light Taillights (taillights, license plate lights and side marker lights) ON/OFF -

      OK: Taillights, license plate lights and side marker lights illuminate. 

      Result 

      RESULT REFERENCE

      Result Proceed to
      Inner taillights (rear light assembly) do not illuminate A
      Outer taillights and side marker lights (rear combination light assembly) do not illuminate B
      License plate lights do not illuminate C
      All rear lights illuminate D
      All rear lights do not illuminate E

      HINT

      If the outer taillights illuminate normally, but the side marker lights do not illuminate, or vice versa, there is an open circuit in the rear combination light assembly

    B: Go to step  9

    C: Go to step  11

    D: REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) 

    E: Go to step  15

    A: Go to next Step 

  7. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - BODY GROUND) 

    HINT

    Perform the following inspection on either the LH or RH side.

    1. Disconnect the Q46 or Q40 rear light assembly connector.
    2. Measure the resistance according to the value (s) in the table below

      Standard Resistance: 

      RH Side 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q46-3 - Body ground Always Below 1 Ω

      LH Side 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q40-3 - Body ground Always Below 1 Ω
      3. Fig 4: Identifying Q46 Or Q40 Rear Light Assembly Connector
      G05756450Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  8. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - MAIN BODY ECU LH) 

    HINT

    Perform the following inspection on either the LH or RH side.

    1. Disconnect the Q46 or Q40 rear light assembly connector
    2. Measure the voltage according to the value (s) in the table below.

      Standard Voltage: 

      RH Side 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q46-1 - Body ground Light control switch off Below 1 V
      Q46-1 - Body ground Light control switch in TAIL 11 to 14 V

      LH Side 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q40-1 - Body ground Light control switch off Below 1 V
      Q40-1 - Body ground Light control switch in TAIL 11 to 14 V
      Fig 5: Identifying Q46 Or Q40 Rear Light Assembly Connector
      G05756450Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE REAR LIGHT ASSEMBLY 

  9. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY - BODY GROUND) 

    HINT:

    Perform the following inspection on either the LH or RH side.

    1. Disconnect the Q51 or Q50 rear combination light assembly connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance: 

      RH Side 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q51-6 (E) - Body ground Always Below 1 Ω

      LH Side 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q50-6 (E) - Body ground Always Below 1 Ω
      3. Fig 6: Identifying Q51 Or Q50 Rear Combination Light Assembly Connector
      G05756452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  10. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY - MAIN BODY ECU LH) 

    HINT

    Perform the following inspection on either the LH or RH side

    1. Disconnect the Q51 or Q50 rear combination light assembly connector.
    2. Measure the voltage according to the value (s) in the table below

      Standard Voltage: 

      RH Side 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q51-3 - Body ground Light control switch off Below 1 V
      Q51-3 - Body ground Light control switch in TAIL 11 to 14 V

      LH Side 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q50-3 - Body ground Light control switch off Below 1 V
      Q50-3 - Body ground Light control switch in TAIL 11 to 14 V
      Fig 7: Identifying Q51 Or Q50 Rear Combination Light Assembly Connector
      G05756452Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE REAR COMBINATION LIGHT ASSEMBLY 

  11. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - BODY GROUND) 

    HINT:

    Perform the following inspection on the LH side.

    1. Disconnect the Q47 license plate light assembly LH connector.
    2. Measure the resistance according to the value (s) in the table below

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q47-2 (E) - Body ground Always Below 1 Ω
      3. Fig 8: Identifying Q47 License Plate Light Assembly LH Connector
      G05756454Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  12. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - MAIN BODY ECU LH) 

    HINT

    Perform the following inspection on the LH side

    1. Disconnect the Q47 license plate light assembly 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
      Q47-1 (B) - Body ground Light control switch off Below 1 V
      Q47-1 (B) - Body ground Light control switch in TAIL 11 to 14 V
      3. Fig 9: Identifying Q47 License Plate Light Assembly LH Connector
      G05756455Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step 13 

    OK: REPLACE LICENSE PLATE LIGHT ASSEMBLY LH 

  13. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY RH - MAIN BODY ECU LH) 

    HINT

    Perform the following inspection on the RH side.

    1. Disconnect the Q44 license plate light assembly RH connector
    2. Measure the voltage according to the value (s) in the table below

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q44-1 (B) - Body ground Light control switch off Below 1 V
      Q44-1 (B) - Body ground Light control switch in TAIL 11 to 14 V
      3. Fig 10: Identifying Q44 License Plate Light Assembly RH Connector
      G05756456Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  14. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - LIGHT ASSEMBLY RH) 
    1. Disconnect the Q44 license plate light assembly RH connector.
    2. Disconnect the Q47 license plate light assembly LH connector
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      STANDARD RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      Q44-2 (E) - Q47-1 (B) Always Below 1 Ω
      Q44-2 (E) - Body ground Always 10 kΩ or higher
      4. Fig 11: Identifying Q47 License Plate Light Assembly LH And Q44 License Plate Light Assembly RH Connector
      G05756457Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE LICENSE PLATE LIGHT ASSEMBLY RH 

  15. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BATTERY) 
    1. Disconnect the RD main body ECU RH connector
    2. Measure the voltage according to the value (s) in the table below

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      RD-1 (TRLY) - Body ground Always 11 to 14 V
      3. Fig 12: Identifying RD Main Body ECU RH Connector
      G05756458Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next Step 

  16. INSPECT MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH) 
    1. Connect the RD main body ECU RH connector
    2. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      RD-1 (TRLY) - Body ground Light control switch off Below 1 V
      RD-1 (TRLY) - Body ground Light control switch in TAIL 11 to 14 V
      3. Fig 13: Identifying RD Main Body ECU RH Connector
      G05756459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: Go to next Step 

  17. INSPECT MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH) 
    1. Measure the voltage according to the value (s) in the table below.

      Standard Voltage 

      STANDARD VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      LJ-24 - Body ground Light control switch off Below 1 V
      LJ-24 - Body ground Light control switch In TAIL 11 to 14 V
      2. Fig 14: Identifying LJ Main Body ECU LH Connector
      G05756460Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU LH - EACH REAR LIGHT) 

scientia non olet · About LEMON Manuals