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Home >> Lexus >> 2014 >> IS 350 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes (1 Of 2) >> Meter / Gauge System >> DTC B1507: Open in Turn Signal Circuit; DTC B1508: Short in Turn Signal / Hazard Flasher Circuit [04/2013 - 10/2016] >> Procedure

DTC B1507: Open in Turn Signal Circuit; DTC B1508: Short in Turn Signal / Hazard Flasher Circuit [04/2013 - 10/2016]: Procedure

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

      Result

      Result Proceed to
      All RH turn signal lights or all LH turn signal lights do not blink. A
      RH side turn signal light does not illuminate. B
      LH side turn signal light does not illuminate. C

    Result: 

    B 

    See step  3

    Result: 

    C 

    See step  12

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR BODY GROUND) 
    1. RH side
      1. Disconnect the K4 combination meter assembly connector.
      2. Disconnect the 4A instrument panel junction block assembly connector.
      3. Disconnect the N9 outer mirror control ECU assembly RH connector*1.
      4. Disconnect the N8 side turn signal light assembly RH connector*2.
        1. *1: w/ Seat Position Memory
        2. *2: w/o Seat Position Memory
      5. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for Open)

        Tester Connection Condition Specified Condition
        K4-7 (LR) - 4A-5 Always Below 1 Ω

        Standard Resistance (Check for Short)

        Tester Connection Condition Specified Condition
        K4-7 (LR) - Body ground Always 10 kΩ or higher
    2. LH side
      1. Disconnect the K4 combination meter assembly connector.
      2. Disconnect the 4A instrument panel junction block assembly connector.
      3. Disconnect the N24 outer mirror control ECU assembly LH connector*1.
      4. Disconnect the N23 side turn signal light assembly LH connector*2.
        1. *1: w/ Seat Position Memory
        2. *2: w/o Seat Position Memory
      5. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for Open)

        Tester Connection Condition Specified Condition
        K4-13 (LL) - 4A-6 Always Below 1 Ω

        Standard Resistance (Check for Short)

        Tester Connection Condition Specified Condition
        K4-13 (LL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  3. CHECK TURN SIGNAL LIGHTS (RH SIDE) 
    1. Turn the engine switch on (IG).
    2. Set the headlight dimmer switch assembly to the right turn switch position.
    3. Check the operation of the turn signal lights (RH side).

      Result

      Result Proceed to
      Front turn signal light assembly (RH side) does not blink. A
      Side turn signal light assembly (RH side) does not blink. B
      Rear turn signal light assembly (RH side) does not blink. C

    Result: 

    B 

    See step  6

    Result: 

    C 

    See step  10

    Result: 

    A 

    See step  4

  4. 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 (Check for Open)

      Tester Connection Condition Specified Condition
      A1-6 (B) - 4C-8 Always Below 1 Ω
      A1-3 (E) - Body ground Always Below 1 Ω

      Standard Resistance (Check for Short)

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [04/2013 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY467873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      4A-5 - 4C-8 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016] 

    Result: 

    NG 

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

  6. CONFIRM MODEL 

    Result

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

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY RH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the K4 combination meter assembly connector.
    2. Disconnect the N9 outer mirror control ECU assembly RH connector.
    3. Disconnect the 4A instrument panel junction block assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      N9-11 (TRNI) - K4-7 (LR) Always Below 1 Ω
      N9-7 (GND) - Body ground Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      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  8

  8. 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.

      Body Electrical > Combination Meter > Trouble Codes 

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

      Result

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

    Result: 

    A 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016] 

    Result: 

    B 

    END 

  9. CHECK HARNESS AND CONNECTOR (SIDE TURN SIGNAL LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the K4 combination meter assembly connector.
    2. Disconnect the N8 side turn signal light assembly RH connector.
    3. Disconnect the 4A instrument panel junction block assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      N8-16 (B) - K4-7 (LR) Always Below 1 Ω
      N8-12 (-) - Body ground Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      K4-7 (LR) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR BODY GROUND) 
    1. Disconnect the Q5 rear combination light assembly RH connector.
    2. Disconnect the 4D instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      Q5-4 (TRN) - 4D-18 Always Below 1 Ω
      Q5-6 (E) - Body ground Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      Q5-4 (TRN) - 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 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [04/2013 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY465391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      4A-5 - 4D-18 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016] 

    Result: 

    NG 

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

  12. CHECK TURN SIGNAL LIGHTS (LH SIDE) 
    1. Turn the engine switch on (IG).
    2. Set the headlight dimmer switch assembly to the left turn switch position.
    3. Check the operation of the turn signal lights (LH side).

      Result

      Result Proceed to
      Front turn signal light assembly (LH side) does not blink. A
      Side turn signal light assembly (LH side) does not blink. B
      Rear turn signal light assembly (LH side) does not blink. C

    Result: 

    B 

    See step  15

    Result: 

    C 

    See step  19

    Result: 

    A 

    See step  13

  13. 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 (Check for Open)

      Tester Connection Condition Specified Condition
      A33-6 (B) - 4C-6 Always Below 1 Ω
      A33-3 (E) - Body ground Always Below 1 Ω

      Standard Resistance (Check for Short)

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [04/2013 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY467873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      4A-6 - 4C-6 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016] 

    Result: 

    NG 

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

  15. CONFIRM MODEL 

    Result

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

    Result: 

    B 

    See step  18

    Result: 

    A 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY LH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the K4 combination meter assembly connector.
    2. Disconnect the N24 outer mirror control ECU assembly LH connector.
    3. Disconnect the 4A instrument panel junction block assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      N24-11 (TRNI) - K4-13 (LL) Always Below 1 Ω
      N24-7 (GND) - Body ground Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      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  17

  17. 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.

      Body Electrical > Combination Meter > Trouble Codes 

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

      Result

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

    Result: 

    A 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016] 

    Result: 

    B 

    END 

  18. CHECK HARNESS AND CONNECTOR (SIDE TURN SIGNAL LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY OR BODY GROUND) 
    1. Disconnect the K4 combination meter assembly connector.
    2. Disconnect the N23 side turn signal light assembly LH connector.
    3. Disconnect the 4A instrument panel junction block assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      N23-16 (B) - K4-13 (LL) Always Below 1 Ω
      N23-12 (-) - Body ground Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      K4-13 (LL) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  19. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY OR BODY GROUND) 
    1. Disconnect the Q43 rear combination light assembly LH connector.
    2. Disconnect the 4D instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      Q43-4 (TRN) - 4D-17 Always Below 1 Ω
      Q43-6 (E) - Body ground Always Below 1 Ω

      Standard Resistance (Check for Short)

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  20

  20. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [04/2013 - ]

    2. Measure the resistance according to the value(s) in the table below.
      GTY465391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      4A-6 - 4D-17 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [04/2013 - 10/2016] 

    Result: 

    NG 

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

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