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Home >> Lexus >> 2015 >> LS 600h >> Repair and Diagnosis (Single Page) >> Restraints >> Restraints Control Systems >> Pre-Collision System - Diagnostic Codes >> Pre-Collision System >> DTC C1A6A: Infrared Signal Circuit [10/2014 - ] >> Procedure

DTC C1A6A: Infrared Signal Circuit [10/2014 - ]: Procedure

  1. CHECK FOR DTC (LIGHTING SYSTEM) 
    1. Check if the lighting system is malfunctioning. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ] .

      OK

      No malfunctions are present in the lighting system.

    NG → See step   15 

    OK: Go to next step 

  2. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) 
    1. Use the Techstream to check if the CAN communication system is functioning normally. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ] .

      OK

      CAN communication DTCs are not output.

    NG → See step   16 

    OK: Go to next step 

  3. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Select the Active Test, use the Techstream to generate a control command, and then check that the near infrared ray emitter operates. Refer to DATA LIST / ACTIVE TEST [10/2014 - ] .
      PRE-COLLISION 2

      Tester Display Test Part Control Range Diagnostic Note
      Infrared Signal Status Near infrared ray emitter operates ON/OFF -

      OK

      A blurred light is emitted.

    NG → See step   9 

    OK: Go to next step 

  4. CHECK OBJECT RECOGNITION ECU 
    1. Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Active Test.
      GTY415528Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Select "Infrared Signal Status", and perform the Active Test.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Condition Specified Condition
      p1-11 (IRFP) - Body ground
      • Power switch on (IG)
      • Active Test is performed
      		 Auxiliary battery voltage x 0.3 to Auxiliary battery x 0.6 V

    NG → See step   7 

    OK: Go to next step 

  5. CHECK OBJECT RECOGNITION ECU 
    1. Measure the voltage according to the value(s) in the table below.
      GTY413666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard voltage

      FOR LH

      Tester Connection Switch Condition Specified Condition
      p1-7 (IRL) - Body ground Power switch on (IG) 11 to 14 V
      FOR RH

      Tester Connection Switch Condition Specified Condition
      p1-3 (IRR) - Body ground Power switch on (IG) 11 to 14 V

    NG → See step   6 

    OK → See step   17 

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - OBJECT RECOGNITION ECU AND BATTERY) 
    1. Disconnect the B1*1 and/or B11*2 headlight connector.
      GTY407735Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • *1: for LH
      • *2: for RH
    2. Disconnect the p1 ECU connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      FOR LH

      Tester Connection Switch Condition Specified Condition
      B1-4 (SOL) - Body ground Power switch on (IG) 11 to 14 V
      FOR RH

      Tester Connection Switch Condition Specified Condition
      B11-4 (SOL) - Body ground Power switch on (IG) 11 to 14 V
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      FOR LH

      Tester Connection Condition Specified Condition
      B1-6 (IRFL) - p1-7 (IRL) Always Below 1 Ω
      B1-6 (IRFL) or p1-7 (IRL) - Body ground Always 10 kΩ or higher
      FOR RH

      Tester Connection Condition Specified Condition
      B11-6 (IRFR) - p1-3 (IRR) Always Below 1 Ω
      B11-6 (IRFR) or p1-3 (IRR) - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      OK (for LH [w/ Side Marker Light]) A
      OK (for RH [w/ Side Marker Light]) B
      OK (for LH [w/o Side Marker Light]) C
      OK (for RH [w/o Side Marker Light]) D
      NG E

    B → See step   12 

    C → See step   13 

    D → See step   14 

    E → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   11 

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BATTERY AND BODY GROUND) 
    1. Disconnect the B1*1 and/or B11*2 headlight connector.
      GTY414205Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • *1: for LH
      • *2: for RH
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      FOR LH

      Tester Connection Switch Condition Specified Condition
      B1-15 (IGED) - Body ground Power switch on (IG) 11 to 14 V
      FOR RH

      Tester Connection Switch Condition Specified Condition
      B11-15 (IGED) - Body ground Power switch on (IG) 11 to 14 V

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - OBJECT RECOGNITION ECU) 
    1. Disconnect the B1*1 and/or B11*2 headlight connector.
      GTY415158Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • *1: for LH
      • *2: for RH
    2. Disconnect the p1 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      FOR LH

      Tester Connection Condition Specified Condition
      B1-19 (IRL) - p1-11 (IRFP) Always Below 1 Ω
      B1-19 (IRL) or p1-11 (IRFP) - Body ground Always 10 kΩ or higher
      FOR RH

      Tester Connection Condition Specified Condition
      B11-19 (IRR) - p1-11 (IRFP) Always Below 1 Ω
      B11-19 (IRR) or p1-11 (IRFP) - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      OK (for LH [w/ Side Marker Light]) A
      OK (for RH [w/ Side Marker Light]) B
      OK (for LH [w/o Side Marker Light]) C
      OK (for RH [w/o Side Marker Light]) D
      NG E

    B → See step   12 

    C → See step   13 

    D → See step   14 

    E → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   11 

  9. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT MULTIPLEX NETWORK LIGHT ECU AND BODY GROUND) 
    1. Disconnect the B1*1 and/or B11*2 headlight connector.
      GTY417028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      • *1: for LH
      • *2: for RH
    2. Disconnect the B14 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      FOR LH

      Tester Connection Condition Specified Condition
      B1-2 (HI) - B14-6 (HLHL) Always Below 1 Ω
      B1-1 (E) - Body ground Always Below 1 Ω
      B1-2 (HI) or B14-6 (HLHL) - Body ground Always 10 kΩ or higher
      FOR RH

      Tester Connection Condition Specified Condition
      B11-2 (HI) - B14-5 (HLHR) Always Below 1 Ω
      B11-1 (E) - Body ground Always Below 1 Ω
      B11-2 (HI) or B14-5 (HLHR) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK FRONT MULTIPLEX NETWORK LIGHT ECU 
    1. Temporarily replace the front multiplex network light ECU with a new or normally functioning one.
    2. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Code. Refer to DTC CHECK / CLEAR [10/2014 - ] .
    3. Select "Clear" and clear the data.
    4. Recheck for DTC. Refer to DTC CHECK / CLEAR [10/2014 - ] .
      RESULT

      Result Proceed to
      DTC C1A6A is not output A
      DTC C1A6A is output (for LH [w/ Side Marker Light]) B
      DTC C1A6A is output (for RH [w/ Side Marker Light]) C
      DTC C1A6A is output (for LH [w/o Side Marker Light]) D
      DTC C1A6A is output (for RH [w/o Side Marker Light]) E

    B → See step   11 

    C → See step   12 

    D → See step   13 

    E → See step   14 

    A → END (FRONT MULTIPLEX NETWORK LIGHT ECU IS DEFECTIVE) 

  11. REPLACE HEADLIGHT UNIT LH. Refer to  REMOVAL [10/2014 - ] 
  12. REPLACE HEADLIGHT UNIT RH. Refer to  REMOVAL [10/2014 - ] 
  13. REPLACE HEADLIGHT UNIT LH. Refer to  REMOVAL [10/2014 - ] 
  14. REPLACE HEADLIGHT UNIT RH. Refer to  REMOVAL [10/2014 - ] 
  15. GO TO LIGHTING SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ] 
  16. GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - ] 
  17. REPLACE OBJECT RECOGNITION ECU. Refer to  REMOVAL [10/2014 - ] 
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