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Home >> Lexus >> 2019 >> IS 350 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes (1 Of 2) >> Meter / Gauge System >> DTC B1508: Short in Turn Signal / Hazard Flasher Circuit [09/2020 - ] >> Procedure

DTC B1508: Short in Turn Signal / Hazard Flasher Circuit [09/2020 - ]: Procedure

  1. CHECK SYMPTOMS 
    1. Check the problem symptoms.

      Result

      Result Proceed to
      All LH side turn signal lights do not blink A
      All RH side turn signal lights do not blink B

    Result: 

    B 

    See step  16

    Result: 

    A 

    See step  2

  2. CHECK LH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT) 
    1. Disconnect the A112 headlight assembly LH connector.
    2. Check the LH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the LH side turn signal lights other than the front turn signal light blink, the headlight assembly LH is malfunctioning.

      Result

      Result Proceed to
      Problem symptoms do not change
      (All LH side turn signal lights do not blink)      		 A
      LH side turn signal lights other than the front turn signal light blink B

    Result: 

    B 

    See step  13

    Result: 

    A 

    See step  3

  3. CONFIRM MODEL 

    Result

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

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  4

  4. CHECK LH SIDE TURN SIGNAL LIGHTS (SIDE TURN SIGNAL LIGHT CIRCUIT) 
    1. Connect the headlight assembly LH connectors.
    2. Disconnect the N24 outer mirror control ECU assembly LH connector.
    3. Check the LH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If the LH side turn signal lights other than the side turn signal light blink, the outer mirror control ECU assembly LH or outer rear view mirror assembly LH is malfunctioning.

      Result

      Result Proceed to
      Problem symptoms do not change
      (All LH side turn signal lights do not blink)      		 A
      LH side turn signal lights other than the side turn signal light blink B

    Result: 

    A 

    See step  8

    Result: 

    B 

    See step  5

  5. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (OUTER MIRROR CONTROL ECU ASSEMBLY LH) 
    1. Remove the outer mirror control ECU assembly LH.

      Refer to REMOVAL [04/2013 - ]

    2. Connect the N24 outer mirror control ECU assembly LH connector.
    3. Check the LH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If all LH side turn signal lights do not blink, the outer mirror control ECU assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights other than the side turn signal light blink A
      All LH side turn signal lights do not blink B

    Result: 

    B 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH. Refer to  REMOVAL [04/2013 - ] 

    Result: 

    A 

    See step  6

  6. CHECK LH SIDE TURN SIGNAL LIGHTS (OUTER MIRROR ACTUATOR ASSEMBLY LH) 
    1. Remove the side turn signal light assembly LH from the outer rear view mirror assembly LH.

      Refer to REMOVAL [09/2020 - ]

    2. Connect the z11 outer mirror control ECU assembly LH connector to the outer mirror actuator assembly LH connector.
    3. Check the LH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If all LH side turn signal lights do not blink, the outer mirror actuator assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights other than the side turn signal light blink A
      All LH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    B 

    REPLACE OUTER MIRROR ACTUATOR ASSEMBLY LH. Refer to  DISASSEMBLY [09/2020 - ] 

  7. CHECK LH SIDE TURN SIGNAL LIGHTS (SIDE TURN SIGNAL LIGHT CIRCUIT) 
    1. Connect the headlight assembly LH connectors.
    2. Disconnect the N23 outer rear view mirror assembly LH connector.
    3. Check the LH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If the LH side turn signal lights other than the side turn signal light blink, the outer rear view mirror assembly LH is malfunctioning.

      Result

      Result Proceed to
      Problem symptoms do not change
      (All LH side turn signal lights do not blink)      		 A
      LH side turn signal lights other than the side turn signal light blink B

    Result: 

    B 

    See step  12

    Result: 

    A 

    See step  8

  8. CHECK LH SIDE TURN SIGNAL LIGHTS (TURN SIGNAL SWITCH CIRCUIT) 
    1. Connect the outer mirror control ECU assembly LH connector.*1
    2. Connect the outer rear view mirror assembly LH connector.*2
    3. Disconnect the K24 windshield wiper switch assembly connector.
    4. Check the LH side turn signal lights other than the rear turn signal light blink.
      NOTE:

      Perform the operation check of the turn signal light using the hazard warning signal switch.

      HINT: 

      If the LH side turn signal lights other than the rear turn signal light blink, the windshield wiper switch assembly is malfunctioning.

      1. *1: w/ Seat Position Memory
      2. *2: w/o Seat Position Memory

      Result

      Result Proceed to
      Problem symptoms do not change
      (All LH side turn signal lights do not blink)      		 A
      LH side turn signal lights other than the rear turn signal light blink B

    Result: 

    B 

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY. Refer to  REMOVAL [04/2013 - ] 

    Result: 

    A 

    See step  9

  9. CHECK LH SIDE TURN SIGNAL LIGHTS (HAZARD WARNING SIGNAL SWITCH CIRCUIT) 
    1. Connect the windshield wiper switch assembly connector.
    2. Disconnect the K65 hazard warning signal switch (air conditioning control assembly) connector.
    3. Check the LH side turn signal lights other than the rear turn signal light blink.
      NOTE:

      Perform the operation check of the turn signal light using the turn signal switch.

      HINT: 

      If the LH side turn signal lights other than the rear turn signal light blink, the hazard warning signal switch (air conditioning control assembly) is malfunctioning.

      Result

      Result Proceed to
      Problem symptoms do not change
      (All LH side turn signal lights do not blink)      		 A
      LH side turn signal lights other than the rear turn signal light blink B

    Result: 

    B 

    REPLACE HAZARD WARNING SIGNAL SWITCH (AIR CONDITIONING CONTROL ASSEMBLY). Refer to  REMOVAL [04/2013 - ] 

    Result: 

    A 

    See step  10

  10. CHECK LH SIDE TURN SIGNAL LIGHTS (REAR TURN SIGNAL LIGHT CIRCUIT) 
    1. Connect the hazard warning signal switch (air conditioning control assembly) connector.
    2. Disconnect the Q43 rear combination light assembly LH connector.
    3. Check the LH side turn signal lights other than the rear turn signal light blink.

      HINT: 

      If the LH side turn signal lights other than the rear turn signal light blink, the rear combination light lens and body LH is malfunctioning.

      Result

      Result Proceed to
      Problem symptoms do not change
      (All LH side turn signal lights do not blink)      		 A
      LH side turn signal lights other than the rear turn signal light blink B

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY LH. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    A 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (LH SIDE (ALL PARTS) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A112 headlight assembly LH connector.
    2. Disconnect the N24 outer mirror control ECU assembly LH connector.*1
    3. Disconnect the N23 outer rear view mirror assembly LH connector.*2
    4. Disconnect the K24 windshield wiper switch assembly connector.
    5. Disconnect the K65 hazard warning signal switch (air conditioning control assembly) connector.
    6. Disconnect the K4 combination meter assembly connector.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A112-11 (TNS), N24-11 (TRNI)*1, N23-16 (B)*2, K24-1 (TRNL), K65-10 (FRLY) or K4-13 (LL) - Body ground Always 10 kΩ or higher
      Q43-4(TRN) or K4-11(TRNL) - 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 [09/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. CHECK LH SIDE TURN SIGNAL LIGHTS (OUTER MIRROR ACTUATOR ASSEMBLY LH) 
    1. Remove the side turn signal light assembly LH from the outer rear view mirror assembly LH.

      Refer to REMOVAL [09/2020 - ]

    2. Connect the N23 outer rear view mirror assembly LH connector.
    3. Check the LH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If all LH side turn signal lights do not blink, the outer mirror actuator assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights other than the side turn signal light blink A
      All LH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    B 

    REPLACE OUTER MIRROR ACTUATOR ASSEMBLY LH. Refer to  DISASSEMBLY [09/2020 - ] 

  13. CHECK LH SIDE TURN SIGNAL LIGHTS (HEADLIGHT ECU SUB-ASSEMBLY LH) 
    1. Remove the headlight ECU sub-assembly LH from the headlight assembly LH.

      Refer to REMOVAL [09/2020 - ]

    2. Connect the A112 headlight assembly LH connector to the headlight ECU sub-assembly LH connector.
    3. Check the LH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If all LH side turn signal lights do not blink, the headlight ECU sub-assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights other than the front turn signal light blink A
      All LH side turn signal lights do not blink B

    Result: 

    B 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    A 

    See step  14

  14. CONFIRM MODEL 

    Result

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

    Result: 

    A 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [09/2020 - ] 

    Result: 

    B 

    See step  15

  15. CHECK LH SIDE TURN SIGNAL LIGHTS (HEADLIGHT UNIT ASSEMBLY LH) 
    1. Remove the headlight cord LH from the headlight assembly LH.

      Refer to DISASSEMBLY [09/2020 - ]

    2. Connect the B headlight ECU sub-assembly LH connector to the headlight unit assembly LH connector.
    3. Check the LH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If all LH side turn signal lights do not blink, the headlight unit assembly LH is malfunctioning.

      Result

      Result Proceed to
      LH side turn signal lights other than the front turn signal light blink A
      All LH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE HEADLIGHT CORD LH. Refer to  DISASSEMBLY [09/2020 - ] 

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [09/2020 - ] 

  16. CHECK RH SIDE TURN SIGNAL LIGHTS (FRONT TURN SIGNAL LIGHT CIRCUIT) 
    1. Disconnect the A110 headlight assembly RH connector.
    2. Check the RH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If the RH side turn signal lights other than the front turn signal light blink, the headlight assembly RH is malfunctioning.

      Result

      Result Proceed to
      Problem symptoms do not change
      (All RH side turn signal lights do not blink)      		 A
      RH side turn signal lights other than the front turn signal light blink B

    Result: 

    B 

    See step  26

    Result: 

    A 

    See step  17

  17. CONFIRM MODEL 

    Result

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

    Result: 

    B 

    See step  21

    Result: 

    A 

    See step  18

  18. CHECK RH SIDE TURN SIGNAL LIGHTS (SIDE TURN SIGNAL LIGHT CIRCUIT) 
    1. Connect the headlight assembly RH connectors.
    2. Disconnect the N9 outer mirror control ECU assembly RH connector.
    3. Check the RH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If the RH side turn signal lights other than the side turn signal light blink, the outer mirror control ECU assembly RH or outer rear view mirror assembly RH is malfunctioning.

      Result

      Result Proceed to
      Problem symptoms do not change
      (All RH side turn signal lights do not blink)      		 A
      RH side turn signal lights other than the side turn signal light blink B

    Result: 

    A 

    See step  22

    Result: 

    B 

    See step  19

  19. CHECK RH SIDE TURN SIGNAL LIGHTS (OUTER MIRROR CONTROL ECU ASSEMBLY RH) 
    1. Remove the outer mirror control ECU assembly RH.

      Refer to REMOVAL [04/2013 - ]

    2. Connect the N9 outer mirror control ECU assembly RH connector.
    3. Check the RH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If all RH side turn signal lights do not blink, the outer mirror control ECU assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights other than the side turn signal light blink A
      All RH side turn signal lights do not blink B

    Result: 

    B 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH. Refer to  REMOVAL [04/2013 - ] 

    Result: 

    A 

    See step  20

  20. CHECK RH SIDE TURN SIGNAL LIGHTS (OUTER MIRROR ACTUATOR ASSEMBLY RH) 
    1. Remove the side turn signal light assembly RH from the outer rear view mirror assembly RH.

      Refer to REMOVAL [09/2020 - ]

    2. Connect the z12 outer mirror control ECU assembly RH connector to the outer mirror actuator assembly RH connector.
    3. Check the RH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If all RH side turn signal lights do not blink, the outer mirror actuator assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights other than the side turn signal light blink A
      All RH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    B 

    REPLACE OUTER MIRROR ACTUATOR ASSEMBLY RH. Refer to  DISASSEMBLY [09/2020 - ] 

  21. CHECK RH SIDE TURN SIGNAL LIGHTS (SIDE TURN SIGNAL LIGHT CIRCUIT) 
    1. Connect the headlight assembly RH connectors.
    2. Disconnect the N8 outer rear view mirror assembly RH connector.
    3. Check the RH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If the RH side turn signal lights other than the side turn signal light blink, the outer rear view mirror assembly RH is malfunctioning.

      Result

      Result Proceed to
      Problem symptoms do not change
      (All RH side turn signal lights do not blink)      		 A
      RH side turn signal lights other than the side turn signal light blink B

    Result: 

    B 

    See step  25

    Result: 

    A 

    See step  22

  22. CHECK RH SIDE TURN SIGNAL LIGHTS (TURN SIGNAL SWITCH CIRCUIT) 
    1. Connect the outer mirror control ECU assembly RH connector.*1
    2. Connect the outer rear view mirror assembly RH connector.*2
    3. Disconnect the K24 windshield wiper switch assembly connector.
    4. Check the RH side turn signal lights other than the rear turn signal light blink.
      NOTE:

      Perform the operation check of the turn signal light using the hazard warning signal switch.

      HINT: 

      If the RH side turn signal lights other than the rear turn signal light blink, the windshield wiper switch assembly is malfunctioning.

      1. *1: w/ Seat Position Memory
      2. *2: w/o Seat Position Memory

      Result

      Result Proceed to
      Problem symptoms do not change
      (All RH side turn signal lights do not blink)      		 A
      RH side turn signal lights other than the rear turn signal light blink B

    Result: 

    B 

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY. Refer to  REMOVAL [04/2013 - ] 

    Result: 

    A 

    See step  23

  23. CHECK RH SIDE TURN SIGNAL LIGHTS (REAR TURN SIGNAL LIGHT CIRCUIT) 
    1. Connect the windshield wiper switch assembly connector.
    2. Disconnect the Q5 rear combination light assembly RH connector.
    3. Check the RH side turn signal lights other than the rear turn signal light blink.

      HINT: 

      If the RH side turn signal lights other than the rear turn signal light blink, the rear combination light lens and body RH is malfunctioning.

      Result

      Result Proceed to
      Problem symptoms do not change
      (All RH side turn signal lights do not blink)      		 A
      RH side turn signal lights other than the rear turn signal light blink B

    Result: 

    B 

    REPLACE REAR COMBINATION LIGHT LENS AND BODY RH. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    A 

    See step  24

  24. CHECK HARNESS AND CONNECTOR (RH SIDE (ALL PARTS) - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A110 headlight assembly RH connector.
    2. Disconnect the N9 outer mirror control ECU assembly RH connector.*1
    3. Disconnect the N8 outer rear view mirror assembly RH connector.*2
    4. Disconnect the K24 windshield wiper switch assembly connector.
    5. Disconnect the K4 combination meter assembly connector.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A110-11 (TNS), N9-11 (TRNI)*1, N8-16 (B)*2, K24-11 (TRNR) or K4-7 (LR) - Body ground Always 10 kΩ or higher
      Q5-4 (TRN) or K4-5 (TRNR) - 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 [09/2020 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  25. CHECK RH SIDE TURN SIGNAL LIGHTS (OUTER MIRROR ACTUATOR ASSEMBLY RH) 
    1. Remove the side turn signal light assembly RH from the outer rear view mirror assembly RH.

      Refer to REMOVAL [09/2020 - ]

    2. Connect the N8 outer rear view mirror assembly RH connector.
    3. Check the RH side turn signal lights other than the side turn signal light blink.

      HINT: 

      If all RH side turn signal lights do not blink, the outer mirror actuator assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights other than the side turn signal light blink A
      All RH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    B 

    REPLACE OUTER MIRROR ACTUATOR ASSEMBLY RH. Refer to  DISASSEMBLY [09/2020 - ] 

  26. CHECK RH SIDE TURN SIGNAL LIGHTS (HEADLIGHT ECU SUB-ASSEMBLY RH) 
    1. Remove the headlight ECU sub-assembly RH from the headlight assembly RH.

      Refer to REMOVAL [09/2020 - ]

    2. Connect the A110 headlight assembly RH connector to the headlight ECU sub-assembly RH connector.
    3. Check the RH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If all RH side turn signal lights do not blink, the headlight ECU sub-assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights other than the front turn signal light blink A
      All RH side turn signal lights do not blink B

    Result: 

    B 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [09/2020 - ] 

    Result: 

    A 

    See step  27

  27. CONFIRM MODEL 

    Result

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

    Result: 

    A 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [09/2020 - ] 

    Result: 

    B 

    See step  28

  28. CHECK RH SIDE TURN SIGNAL LIGHTS (HEADLIGHT UNIT ASSEMBLY RH) 
    1. Remove the headlight cord RH from the headlight assembly RH.

      Refer to DISASSEMBLY [09/2020 - ]

    2. Connect the C headlight ECU sub-assembly RH connector to the headlight unit assembly RH connector.
    3. Check the RH side turn signal lights other than the front turn signal light blink.

      HINT: 

      If all RH side turn signal lights do not blink, the headlight unit assembly RH is malfunctioning.

      Result

      Result Proceed to
      RH side turn signal lights other than the front turn signal light blink A
      All RH side turn signal lights do not blink B

    Result: 

    A 

    REPLACE HEADLIGHT CORD RH. Refer to  DISASSEMBLY [09/2020 - ] 

    Result: 

    B 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [09/2020 - ] 

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