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Home >> Lexus >> 2016 >> 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 [10/2016 - 09/2020] >> Procedure

DTC B1508: Short in Turn Signal / Hazard Flasher Circuit [10/2016 - 09/2020]: Procedure

  1. INSPECT LIGHTS 
    1. Inspect the illumination of each turn signal light.

      Result

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

    Result: 

    B 

    See step  12

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the Q43 rear combination light assembly LH connector.
    2. Disconnect the K4 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q43-4 (TRN) or K4-11 (TRNL) - Body ground Always 10 kΩ or higher

      Result

      Result Proceed to
      OK (w/ AFS (Adaptive Front-lighting System)) A
      OK (w/o AFS (Adaptive Front-lighting System)) B
      NG C

    Result: 

    B 

    See step  4

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR BODY GROUND) 
    1. Disconnect the A33 headlight assembly LH connector.
    2. Disconnect the 4C instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A33-6 (B) or 4C-6 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  5

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the r1 No. 1 headlight ECU sub-assembly LH connector.
    2. Disconnect the 4C instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      r1-11 (TNS) or 4C-6 - Body ground Always 10 kΩ or higher

      Result

      Result Proceed to
      OK A
      NG B

    Result: 

    B 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  5

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY656411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Instrument Panel Junction Block Assembly)    		 - -
    1. Measure the resistance according to the value(s) in the table below.
      NOTE:

      Make sure to perform this step with the instrument panel junction block assembly installed to the vehicle.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4C-6 or 4A-6 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [04/2013 - ] 

    Result: 

    OK 

    See step  6

  6. CONFIRM MODEL 

    Result

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

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND OUTER MIRROR CONTROL ECU ASSEMBLY LH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the 4A instrument panel junction block assembly connector.
    2. Disconnect the N24 outer mirror control ECU assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4A-6, N24-11(TRNI) or K4-13 (LL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH 
    GTY641973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Outer Rear View Mirror Assembly LH)
    1. Remove the outer rear view mirror assembly LH.

      Refer to REMOVAL [10/2016 - 09/2020]

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

      Refer to DISASSEMBLY [04/2013 - 09/2020]

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z11-16 - z11-12 Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH. Refer to  REMOVAL [10/2016 - 09/2020] 

    Result: 

    OK 

    See step  9

  9. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY LH 
    1. Replace the outer mirror control ECU assembly LH with a new or known good one.

      Refer to REMOVAL [04/2013 - ]

    2. Check for the DTCs.

      Refer to DTC CHECK / CLEAR [04/2013 - ]

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2016 - 09/2020] 

  10. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND OUTER REAR VIEW MIRROR ASSEMBLY LH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the 4A instrument panel junction block assembly connector.
    2. Disconnect the N23 outer rear view mirror assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4A-6, N23-16(B) or K4-13 (LL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH 
    GTY611927Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Outer Rear View Mirror Assembly LH)
    1. Remove the outer rear view mirror assembly LH.

      Refer to REMOVAL [10/2016 - 09/2020]

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

      Refer to DISASSEMBLY [04/2013 - 09/2020]

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N23-16 (B) - N23-12 (-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2016 - 09/2020] 

    Result: 

    NG 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH. Refer to  REMOVAL [10/2016 - 09/2020] 

  12. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the Q5 rear combination light assembly RH connector.
    2. Disconnect the K4 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q5-4 (TRN) or K4-5 (TRNR) - Body ground Always 10 kΩ or higher

      Result

      Result Proceed to
      OK (w/ AFS (Adaptive Front-lighting System)) A
      OK (w/o AFS (Adaptive Front-lighting System)) B
      NG C

    Result: 

    B 

    See step  14

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR BODY GROUND) 
    1. Disconnect the A1 headlight assembly RH connector.
    2. Disconnect the 4C instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A1-6 (B) or 4C-6 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  15

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the q1 No. 1 headlight ECU sub-assembly RH connector.
    2. Disconnect the 4C instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      q1-11 (TNS) or 4C-8 - Body ground Always 10 kΩ or higher

      Result

      Result Proceed to
      OK A
      NG B

    Result: 

    B 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  15

  15. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY656411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Instrument Panel Junction Block Assembly)    		 - -
    1. Measure the resistance according to the value(s) in the table below.
      NOTE:

      Make sure to perform this step with the instrument panel junction block assembly installed to the vehicle.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4C-8 or 4A-5 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [04/2013 - ] 

    Result: 

    OK 

    See step  16

  16. CONFIRM MODEL 

    Result

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

    Result: 

    B 

    See step  20

    Result: 

    A 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND OUTER MIRROR CONTROL ECU ASSEMBLY RH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the 4A instrument panel junction block assembly connector.
    2. Disconnect the N9 outer mirror control ECU assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4A-5, N9-11(TRNI) or K4-7 (LR) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  18

  18. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH 
    GTY641975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Outer Rear View Mirror Assembly RH)
    1. Remove the outer rear view mirror assembly RH.

      Refer to REMOVAL [10/2016 - 09/2020]

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

      Refer to DISASSEMBLY [04/2013 - 09/2020]

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      z12-16 - z12-12 Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to  REMOVAL [10/2016 - 09/2020] 

    Result: 

    OK 

    See step  19

  19. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH 
    1. Replace the outer mirror control ECU assembly RH with a new or known good one.

      Refer to REMOVAL [04/2013 - ]

    2. Check for the DTCs.

      Refer to DTC CHECK / CLEAR [04/2013 - ]

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2016 - 09/2020] 

  20. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND OUTER REAR VIEW MIRROR ASSEMBLY RH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the 4A instrument panel junction block assembly connector.
    2. Disconnect the N8 outer rear view mirror assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4A-5, N8-16(B) or K4-7 (LR) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  21

  21. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH 
    GTY672359Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Outer Rear View Mirror Assembly RH)
    1. Remove the outer rear view mirror assembly RH.

      Refer to REMOVAL [10/2016 - 09/2020]

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

      Refer to DISASSEMBLY [04/2013 - 09/2020]

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      N8-16 (B) - N8-12 (-) Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2016 - 09/2020] 

    Result: 

    NG 

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH. Refer to  REMOVAL [10/2016 - 09/2020] 

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