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Home >> Lexus >> 2023 >> RX 350h Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes & Symptom Tests (1 Of 2) >> Meter / Gauge System >> DTC B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [10/2022 - ] >> Procedure

DTC B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [10/2022 - ]: Procedure

  1. CHECK SYMPTOMS 
    1. Operate the turn signal switch and check the problem symptoms.

      Result

      Result Proceed to
      Front turn signal light (LH side) does not blink A
      Side turn signal light (LH side) does not blink B
      Rear turn signal light (LH side) does not blink C
      Front turn signal light (RH side) does not blink D
      Side turn signal light (RH side) does not blink E
      Rear turn signal light (RH side) does not blink F

    Result: 

    B 

    See step  3

    Result: 

    C 

    See step  13

    Result: 

    D 

    See step  16

    Result: 

    E 

    See step  17

    Result: 

    F 

    See step  26

    Result: 

    A 

    See step  2

  2. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for LED Type Turn Signal Light A
      for Bulb Type Turn Signal Light B

    Result: 

    A 

    See step  4

    Result: 

    B 

    See step  5

  3. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for LED Type Turn Signal Light A
      for Bulb Type Turn Signal Light B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  4

  4. CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY LH) 

    Pre-procedure1

    • Remove the headlight assembly LH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Remove the headlight assembly RH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Interchange the headlight assembly LH with RH and connect the connectors.
    • Check the front/side turn signal light (LH side) operates normally.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Front/side turn signal light (LH side) does not blink)      		 A
      Front/side turn signal light (LH side) operates normally B

    Post-procedure1

    • None

    Result: 

    A 

    See step  6

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [10/2022 - ] 

  5. CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY LH) 

    Pre-procedure1

    • Remove the headlight assembly LH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Remove the headlight assembly RH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Interchange the headlight assembly LH with RH and connect the connectors.
    • Check the front/side turn signal light (LH side) operates normally.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Front/side turn signal light (LH side) does not blink)      		 A
      Front/side turn signal light (LH side) operates normally B

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    A 

    See step  6

  6. INSPECT OUTER MIRROR CONTROL ECU ASSEMBLY LH 

    Pre-procedure1

    • Measure the resistance according to the value(s) in the table below.
      GTY1123453Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Outer Mirror Control ECU Assembly LH)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z9-16 (TRN+) - z9-12 (TRN-) Always 10 kΩ or higher kΩ
      D31-11 (TRNI) - D31-7 (GND) Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK TURN SIGNAL LIGHT (OUTER REAR VIEW MIRROR ASSEMBLY LH) 

    Pre-procedure1

    • Remove the outer rear view mirror assembly LH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Remove the outer rear view mirror assembly RH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Interchange the outer rear view mirror assembly LH with RH and connect the connectors.
    • Check the front/side turn signal light (LH side) operates normally.
      NOTE:

      If the front/side turn signal light (LH side) operates normally, return the outer rear view mirror assembly LH and outer rear view mirror assembly RH that were interchanged in a previous step back to their original conditions so that a component of the outer rear view mirror assembly LH can be inspected in the next step.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Front/side turn signal light (LH side) does not blink)      		 A
      Front/side turn signal light (LH side) operates normally B

    Post-procedure1

    • None

    Result: 

    B 

    See step  12

    Result: 

    A 

    See step  8

  8. CHECK TURN SIGNAL LIGHT (HAZARD WARNING SIGNAL SWITCH ASSEMBLY) 

    Pre-procedure1

    • Disconnect the C27 hazard warning signal switch assembly connector.
    • Check the front/side turn signal light (LH side) operates normally.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Front/side turn signal light (LH side) does not blink)      		 A
      Front/side turn signal light (LH side) operates normally B

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE HAZARD WARNING SIGNAL SWITCH ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    A 

    See step  9

  9. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for LED Type Turn Signal Light A
      for Bulb Type Turn Signal Light B

    Result: 

    B 

    See step  11

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (FRONT/ SIDE TURN SIGNAL LIGHT (LH SIDE) - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the A43 headlight assembly LH connector.
    • Disconnect the D31 outer mirror control ECU assembly LH connector.
    • Disconnect the C19 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      A43-11 (TNS), D31-11 (TRNI), C27-4 (HFL) or C19-5 (LL) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK HARNESS AND CONNECTOR (FRONT/ SIDE TURN SIGNAL LIGHT (LH SIDE) - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the A53 headlight assembly LH connector.
    • Disconnect the D31 outer mirror control ECU assembly LH connector.
    • Disconnect the C19 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      A53-1 (B), D31-11 (TRNI), C27-4 (HFL) or C19-5 (LL) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. CHECK TURN SIGNAL LIGHT (SIDE TURN SIGNAL LIGHT ASSEMBLY LH) 

    Pre-procedure1

    • Remove the side turn signal light assembly LH from the outer rear view mirror assembly LH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Remove the side turn signal light assembly RH from the outer rear view mirror assembly RH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Interchange the side turn signal light assembly LH with RH and connect the connectors.
    • Check the front/side turn signal light (LH side) operates normally.

      Result

      Result Proceed to
      Front/side turn signal light (LH side) operates normally A
      Front/side turn signal light (LH side) does not blink B

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    B 

    REPLACE OUTER MIRROR RETRACTOR LH. Refer to  DISASSEMBLY [10/2022 - ] 

  13. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT SOCKET AND WIRE LH) 

    Pre-procedure1

    • Check the rear turn signal light (LH side) operates normally.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Rear turn signal light (LH side) does not blink)      		 A
      Rear turn signal light (LH side) operates normally B

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    A 

    See step  14

  14. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT LENS AND BODY LH) 

    Pre-procedure1

    • Remove the rear combination light lens and body LH from the rear combination light assembly LH.

      HINT: 

      Refer to DISASSEMBLY [10/2022 - ]

    • Remove the rear combination light lens and body RH from the rear combination light assembly RH.

      HINT: 

      Refer to DISASSEMBLY [10/2022 - ]

    • Interchange the rear combination light lens and body LH with RH and connect the connectors.
    • Check the rear turn signal light (LH side) operates normally.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Rear turn signal light (LH side) does not blink)      		 A
      Rear turn signal light (LH side) operates normally B

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY LH. Refer to  DISASSEMBLY [10/2022 - ] 

    Result: 

    A 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (REAR TURN SIGNAL LIGHT (LH SIDE) - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the H123 rear combination light assembly LH connector.
    • Disconnect the C19 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      H123-4 (TRN) or C19-22 (TRNL) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for LED Type Turn Signal Light A
      for Bulb Type Turn Signal Light B

    Result: 

    A 

    See step  18

    Result: 

    B 

    See step  19

  17. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for LED Type Turn Signal Light A
      for Bulb Type Turn Signal Light B

    Result: 

    B 

    See step  19

    Result: 

    A 

    See step  18

  18. CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY RH) 

    Pre-procedure1

    • Remove the headlight assembly RH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Remove the headlight assembly LH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Interchange the headlight assembly RH with LH and connect the connectors.
    • Check the front/side turn signal light (RH side) operates normally.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Front/side turn signal light (RH side) does not blink)      		 A
      Front/side turn signal light (RH side) operates normally B

    Post-procedure1

    • None

    Result: 

    A 

    See step  20

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [10/2022 - ] 

  19. CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY RH) 

    Pre-procedure1

    • Remove the headlight assembly RH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Remove the headlight assembly LH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Interchange the headlight assembly RH with LH and connect the connectors.
    • Check the front/side turn signal light (RH side) operates normally.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Front/side turn signal light (RH side) does not blink)      		 A
      Front/side turn signal light (RH side) operates normally B

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    A 

    See step  20

  20. INSPECT OUTER MIRROR CONTROL ECU ASSEMBLY RH 

    Pre-procedure1

    • Measure the resistance according to the value(s) in the table below.
      GTY1128564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Outer Mirror Control ECU Assembly RH)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z8-16 (TRN+) - z8-12 (TRN-) Always 10 kΩ or higher kΩ
      D11-11 (TRNI) - D11-7 (GND) Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  21

  21. CHECK TURN SIGNAL LIGHT (OUTER REAR VIEW MIRROR ASSEMBLY RH) 

    Pre-procedure1

    • Remove the outer rear view mirror assembly RH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Remove the outer rear view mirror assembly LH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Interchange the outer rear view mirror assembly RH with LH and connect the connectors.
    • Check the front/side turn signal light (RH side) operates normally.
      NOTE:

      If the front/side turn signal light (RH side) operates normally, return the outer rear view mirror assembly RH and outer rear view mirror assembly LH that were interchanged in a previous step back to their original conditions so that a component of the outer rear view mirror assembly RH can be inspected in the next step.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Front/side turn signal light (RH side) does not blink)      		 A
      Front/side turn signal light (RH side) operates normally B

    Post-procedure1

    • None

    Result: 

    B 

    See step  25

    Result: 

    A 

    See step  22

  22. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for LED Type Turn Signal Light A
      for Bulb Type Turn Signal Light B

    Result: 

    B 

    See step  24

    Result: 

    A 

    See step  23

  23. CHECK HARNESS AND CONNECTOR (FRONT/ SIDE TURN SIGNAL LIGHT (RH SIDE) - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the A44 headlight assembly RH connector.
    • Disconnect the D11 outer mirror control ECU assembly RH connector.
    • Disconnect the C19 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      A44-11 (TNS), D11-11 (TRNI) or C19-6 (LR) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  24. CHECK HARNESS AND CONNECTOR (FRONT/ SIDE TURN SIGNAL LIGHT (RH SIDE) - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the A52 headlight assembly RH connector.
    • Disconnect the D11 outer mirror control ECU assembly RH connector.
    • Disconnect the C19 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      A52-1 (B), D11-11 (TRNI) or C19-6 (LR) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  25. CHECK TURN SIGNAL LIGHT (SIDE TURN SIGNAL LIGHT ASSEMBLY RH) 

    Pre-procedure1

    • Remove the side turn signal light assembly RH from the outer rear view mirror assembly RH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Remove the side turn signal light assembly LH from the outer rear view mirror assembly LH.

      HINT: 

      Refer to REMOVAL [10/2022 - ]

    • Interchange the side turn signal light assembly RH with LH and connect the connectors.
    • Check the front/side turn signal light (RH side) operates normally.

      Result

      Result Proceed to
      Front/side turn signal light (RH side) operates normally A
      Front/side turn signal light (RH side) does not blink B

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    B 

    REPLACE OUTER MIRROR RETRACTOR RH. Refer to  DISASSEMBLY [10/2022 - ] 

  26. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT SOCKET AND WIRE RH) 

    Pre-procedure1

    • Check the rear turn signal light (RH side) operates normally.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Rear turn signal light (RH side) does not blink)      		 A
      Rear turn signal light (RH side) operates normally B

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    A 

    See step  27

  27. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT LENS AND BODY RH) 

    Pre-procedure1

    • Remove the rear combination light lens and body RH from the rear combination light assembly RH.

      HINT: 

      Refer to DISASSEMBLY [10/2022 - ]

    • Remove the rear combination light lens and body LH from the rear combination light assembly LH.

      HINT: 

      Refer to DISASSEMBLY [10/2022 - ]

    • Interchange the rear combination light lens and body RH with LH and connect the connectors.
    • Check the rear turn signal light (RH side) operates normally.

      Result

      Result Proceed to
      Problem symptoms do not change
      (Rear turn signal light (RH side) does not blink)      		 A
      Rear turn signal light (RH side) operates normally B

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY RH. Refer to  DISASSEMBLY [10/2022 - ] 

    Result: 

    A 

    See step  28

  28. CHECK HARNESS AND CONNECTOR (REAR TURN SIGNAL LIGHT (RH SIDE) - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the H22 rear combination light assembly RH connector.
    • Disconnect the C19 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      H22-4 (TRN) or C19-21 (TRNR) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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