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Home >> Lexus >> 2010 >> LX 570 >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting (Exterior) (Diagnostic Codes & Symptom Tests) >> Lighting System >> Clearance Light does not Illuminate >> Procedure

Clearance Light does not Illuminate: Procedure

  1. CHECK FOR DTC 
    1. Check for DTCs. Refer to DTC CHECK / CLEAR .

      OK

      DTC B2402 output does not occur.

    NG → See step   14 

    OK: Go to next step 

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

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Head Light SW (Tail) Headlight dimmer switch (Tail) signal/ON or OFF ON: Headlight dimmer switch (Tail) on
      OFF: Headlight dimmer switch off      		 -

      OK

      When the headlight dimmer switch operation is performed, the result will be the same as above.

    NG → See step   4 

    OK: Go to next step 

  3. PERFORM ACTIVE TEST USING TECHSTREAM (TAILLIGHT) 
    1. Using the Techstream, perform the Active Test.
      MAIN BODY

      Tester Display Test Part Control Range Diagnostic Note
      Taillight Relay Taillight OFF/ON -

      OK

      Taillight turns on/off.

    NG → See step   6 

    OK → REPLACE MAIN BODY ECU 

  4. INSPECT HEADLIGHT DIMMER SWITCH 
    1. Remove the headlight dimmer switch. Refer to INSPECTION - Step 1 .
      Fig 1: Inspecting Headlight Dimmer Switch
      GTY142343Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) tail Below 1 Ω
      18 (T) - 12 (EL) Headlight dimmer switch (Light control switch) off 10 kΩ or higher

    NG → See step   15 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the E14 switch connector.
      Fig 2: Identifying E14 Switch And E1 ECU Connectors
      GTY154160Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E1 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E14-18 (T) - E1-23 (TAIL) Always Below 1 Ω
      E14-12 (EL) - Body ground
      E14-18 (T) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE MAIN BODY ECU 

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BODY GROUND) 
    Fig 3: Identifying 2A ECU Connector Terminals
    GTY153522Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 2A ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      2A-1 - Body ground Always 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. CHECK MAIN BODY ECU 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 4: Checking Main Body ECU
      GTY132865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      2B-8 (TRLY) - Body ground Engine switch on (IG) and headlight dimmer switch (tail) on 11 to 14 V
      2C-22 (TRLY) - Body ground

    NG → REPLACE MAIN BODY ECU 

    OK: Go to next step 

  8. CONFIRM LIGHT POSITION 
    1. Check the malfunctioning light.
      RESULT

      Result Proceed to
      Clearance light does not illuminate A
      Front side marker light does not illuminate B
      Rear side marker light does not illuminate C
      Taillight does not illuminate D
      License plate light does not illuminate E

    E → See step   13 

    D → See step   12 

    C → See step   11 

    B → See step   10 

    A: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (HEADLIGHT - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the 2B ECU connector.
      Fig 5: Identifying 2B ECU , A41 And A47 Light Connectors
      GTY154127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the A41 and A47 light connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      for LH 

      for RH 

      Tester Connection Condition Specified Condition
      2B-8 (TRLY) - A41-3 (B) Always Below 1 Ω
      A41-1 (E) - Body ground
      A41-3 (B) - Body ground Always 10 kΩ or higher
      Tester Connection Condition Specified Condition
      2B-8 (TRLY) - A47-3 (B) Always Below 1 Ω
      A47-1 (E) - Body ground
      A47-3 (B) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   16 

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the 2B ECU connector.
      Fig 6: Identifying 2B ECU , A40 And A46 Light Connectors
      GTY138818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the A40 and A46 light connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      for LH 

      for RH 

      Tester Connection Condition Specified Condition
      2B-8 (TRLY) - A40-8 (B) Always Below 1 Ω
      A40-11 (E) - Body ground
      A40-8 (B) - Body ground Always 10 kΩ or higher
      Tester Connection Condition Specified Condition
      2B-8 (TRLY) - A46-8 (B) Always Below 1 Ω
      A46-11 (E) - Body ground
      A46-8 (B) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   16 

  11. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the 2C ECU connector.
      Fig 7: Identifying 2C ECU , K4 And L3 Light Connectors
      GTY138147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the K4 and L3 light connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      for LH 

      for RH 

      Tester Connection Condition Specified Condition
      2C-22 (TRLY) - K4-6 (TL) Always Below 1 Ω
      K4-3 (E) - Body ground
      K4-6 (TL) - Body ground Always 10 kΩ or higher
      Tester Connection Condition Specified Condition
      2C-22 (TRLY) - L3-6 (TL) Always Below 1 Ω
      L3-3 (E) - Body ground
      L3-6 (TL) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   17 

  12. CHECK HARNESS AND CONNECTOR (REAR LIGHT - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the 2C ECU connector.
      Fig 8: Identifying 2C ECU , S11 And S12 Light Connectors
      GTY154128Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the S11 and S12 light connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      for LH 

      for RH 

      Tester Connection Condition Specified Condition
      2C-22 (TRLY) - S11-3 Always Below 1 Ω
      S11-1 - Body ground
      S11-3 - Body ground Always 10 kΩ or higher
      Tester Connection Condition Specified Condition
      2C-22 (TRLY) - S12-3 Always Below 1 Ω
      S12-1 - Body ground
      S12-3 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   18 

  13. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the 2C ECU connector.
      Fig 9: Identifying 2C ECU , S23 Light Connectors
      GTY154165Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the S23 light connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2C-22 (TRLY) - S23-2 (B) Always Below 1 Ω
      S23-1 (E) - Body ground
      S23-2 (B)- Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   19 

  14. GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  15. REPLACE HEADLIGHT DIMMER SWITCH. Refer to  REMOVAL 
  16. REPLACE HEADLIGHT. Refer to  REMOVAL 
  17. REPLACE REAR COMBINATION LIGHT. Refer to  REMOVAL 
  18. REPLACE REAR LIGHT. Refer to  REMOVAL 
  19. REPLACE LICENSE PLATE LIGHT. Refer to  REMOVAL 
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