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Home >> Lexus >> 2021 >> ES 250 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 172 (Meter / Gauge System (Hybrid) - Diagnostic Codes (2 Of 2) & Symptom Tests) >> METER / GAUGE SYSTEM (for HV Model) >> DTC B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [08/2021 - ] >> Procedure

DTC B1508-19: Turn Signal/Hazard Flasher Circuit Current Above Threshold [08/2021 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  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
      Rear turn signal light (LH side) does not blink B
      Front turn signal light (RH side) does not blink C
      Side turn signal light (RH side) does not blink
      Rear turn signal light (RH side) does not blink D

    Result: 

    B 

    See step  12

    Result: 

    C 

    See step  14

    Result: 

    D 

    See step  23

    Result: 

    A 

    See step  2

  2. INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH 
    1. Remove the headlight ECU sub-assembly LH.

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY962601Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Headlight ECU Sub-assembly LH)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A78-11 (TNS) - A78-12 (GND) Always 10 kΩ or higher
      B-20 (TURN+) - B-13 (TURN-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [06/2018 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  3

  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 UNIT ASSEMBLY LH) 
    1. Remove the headlight unit assembly LH from the headlight assembly LH.

      Refer to DISASSEMBLY [08/2021 - ]

    2. Remove the headlight unit assembly RH from the headlight assembly RH.

      Refer to DISASSEMBLY [08/2021 - ]

    3. Interchange the headlight unit assembly LH with RH and connect the connectors.
    4. 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

    Result: 

    A 

    See step  6

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [08/2021 - ] 

  5. CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY LH) 
    1. Remove the headlight assembly LH.

      Refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Remove the headlight assembly RH.

      Refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    3. Interchange the headlight assembly LH with RH and connect the connectors.
      NOTE:

      Do not interchange the headlight ECU sub-assembly LH with RH.

    4. 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

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY LH. Refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  6

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

      Result

      Result Proceed to
      w/ Seat Position Memory A
      w/o Seat Position Memory B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  7

  7. INSPECT OUTER MIRROR CONTROL ECU ASSEMBLY LH 
    1. Remove the outer mirror control ECU assembly LH.

      Refer to REMOVAL [06/2018 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY809706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Outer Mirror Control ECU Assembly LH)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      z20-16 (T+) - z20-12 (GND) Always 10 kΩ or higher
      J28-11 (TRNI) - J28-7 (GND) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  8

    Result: 

    NG 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH. Refer to  REMOVAL [06/2018 - ] 

  8. CHECK TURN SIGNAL LIGHT (OUTER REAR VIEW MIRROR ASSEMBLY LH) 
    1. Remove the outer rear view mirror assembly LH.

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Remove the outer rear view mirror assembly RH.

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    3. Interchange the outer rear view mirror assembly LH with RH and connect the connectors.
    4. 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

    Result: 

    B 

    See step  11

    Result: 

    A 

    See step  9

  9. CHECK TURN SIGNAL LIGHT (HAZARD WARNING SIGNAL SWITCH ASSEMBLY) 
    1. Disconnect the G24 hazard warning signal switch assembly connector.
    2. 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

    Result: 

    B 

    REPLACE HAZARD WARNING SIGNAL SWITCH ASSEMBLY. Refer to  REMOVAL [08/2021 - ] 

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (FRONT/SIDE TURN SIGNAL LIGHT (LH SIDE) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A78 headlight assembly LH connector.
    2. Disconnect the J28 outer mirror control ECU assembly LH connector.*1
    3. Disconnect the J33 outer rear view mirror assembly LH connector.*2
    4. Disconnect the G16 combination meter assembly connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A78-11 (TNS), J28-11 (TRNI)*1, J33-16 (B)*2, G24-2 (HFL) or G16-13 (LL) - Body ground Always 10 kΩ or higher
      1. *1: w/ Seat Position Memory
      2. *2: w/o Seat Position Memory

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK TURN SIGNAL LIGHT (SIDE TURN SIGNAL LIGHT ASSEMBLY LH) 
    1. Remove the side turn signal light assembly LH from the outer rear view mirror assembly LH.

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

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

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    3. Interchange the side turn signal light assembly LH with RH and connect the connectors.
    4. 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

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [06/2018 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    REPLACE OUTER MIRROR RETRACTOR LH. Refer to  DISASSEMBLY [06/2018 - ] 

  12. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT ASSEMBLY LH) 
    1. Remove the rear combination light assembly LH.

      Refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Remove the rear combination light assembly RH.

      Refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    3. Interchange the rear combination light assembly LH with RH and connect the connectors.
    4. 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

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH. Refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (REAR TURN SIGNAL LIGHT (LH SIDE) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the R9 rear combination light assembly LH connector.
    2. Disconnect the G16 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R9-3 (TRN) or G16-11 (TRNL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH 
    1. Remove the headlight ECU sub-assembly RH.

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY962599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Headlight ECU Sub-assembly RH)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A79-11 (TNS) - A79-12 (GND) Always 10 kΩ or higher
      C-20 (TURN+) - C-13 (TURN-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [06/2018 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  15

  15. 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  17

    Result: 

    A 

    See step  16

  16. CHECK TURN SIGNAL LIGHT (HEADLIGHT UNIT ASSEMBLY RH) 
    1. Remove the headlight unit assembly RH from the headlight assembly RH.

      Refer to DISASSEMBLY [08/2021 - ]

    2. Remove the headlight unit assembly LH from the headlight assembly LH.

      Refer to DISASSEMBLY [08/2021 - ]

    3. Interchange the headlight unit assembly RH with LH and connect the connectors.
    4. 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

    Result: 

    A 

    See step  18

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [08/2021 - ] 

  17. CHECK TURN SIGNAL LIGHT (HEADLIGHT ASSEMBLY RH) 
    1. Remove the headlight assembly RH.

      Refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Remove the headlight assembly LH.

      Refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    3. Interchange the headlight assembly RH with LH and connect the connectors.
      NOTE:

      Do not interchange the headlight ECU sub-assembly RH with LH.

    4. 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

    Result: 

    B 

    REPLACE HEADLIGHT ASSEMBLY RH. Refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  18

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

      Result

      Result Proceed to
      w/ Seat Position Memory A
      w/o Seat Position Memory B

    Result: 

    B 

    See step  20

    Result: 

    A 

    See step  19

  19. INSPECT OUTER MIRROR CONTROL ECU ASSEMBLY RH 
    1. Remove the outer mirror control ECU assembly RH.

      Refer to REMOVAL [06/2018 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY809704Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Outer Mirror Control ECU Assembly RH)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      z19-16 (T+) - z19-12 (GND) Always 10 kΩ or higher
      J6-11 (TRNI) - J6-7 (GND) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  20

    Result: 

    NG 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH. Refer to  REMOVAL [06/2018 - ] 

  20. CHECK TURN SIGNAL LIGHT (OUTER REAR VIEW MIRROR ASSEMBLY RH) 
    1. Remove the outer rear view mirror assembly RH.

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Remove the outer rear view mirror assembly LH.

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    3. Interchange the outer rear view mirror assembly RH with LH and connect the connectors.
    4. 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

    Result: 

    B 

    See step  22

    Result: 

    A 

    See step  21

  21. CHECK HARNESS AND CONNECTOR (FRONT/SIDE TURN SIGNAL LIGHT (RH SIDE) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A79 headlight assembly RH connector.
    2. Disconnect the J6 outer mirror control ECU assembly RH connector.*1
    3. Disconnect the J11 outer rear view mirror assembly RH connector.*2
    4. Disconnect the G16 combination meter assembly connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A79-11 (TNS), J6-11 (TRNI)*1, J11-16 (B)*2 or G16-7 (LR) - Body ground Always 10 kΩ or higher
      1. *1: w/ Seat Position Memory
      2. *2: w/o Seat Position Memory

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  22. CHECK TURN SIGNAL LIGHT (SIDE TURN SIGNAL LIGHT ASSEMBLY RH) 
    1. Remove the side turn signal light assembly RH from the outer rear view mirror assembly RH.

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

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

      Refer to REMOVAL [06/2018 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    3. Interchange the side turn signal light assembly RH with LH and connect the connectors.
    4. 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

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [06/2018 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    B 

    REPLACE OUTER MIRROR RETRACTOR RH. Refer to  DISASSEMBLY [06/2018 - ] 

  23. CHECK TURN SIGNAL LIGHT (REAR COMBINATION LIGHT ASSEMBLY RH) 
    1. Remove the rear combination light assembly RH.

      Refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Remove the rear combination light assembly LH.

      Refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    3. Interchange the rear combination light assembly RH with LH and connect the connectors.
    4. 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

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT ASSEMBLY RH. Refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  24

  24. CHECK HARNESS AND CONNECTOR (REAR TURN SIGNAL LIGHT (RH SIDE) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the R8 rear combination light assembly RH connector.
    2. Disconnect the G16 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      R8-3 (TRN) or G16-5 (TRNR) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2021 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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