METER / GAUGE SYSTEM, Diagnostic DTC:B1507, B1508

DTC Code DTC Name
B1507 Open in Turn Signal Circuit
B1508 Short in Turn Signal / Hazard Flasher Circuit

DESCRIPTION

These DTCs are stored when the combination meter assembly detects an open in a turn signal light circuit, a short in a turn signal light circuit, or a short in the hazard warning light circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1507 Open in Turn Signal Circuit

Both conditions are met:


  • IG voltage is 10.5 V or higher.

  • Open in turn signal light circuit.

  • Harness or connector

  • Side turn signal light assembly

  • Outer rear view mirror assembly

  • Rear combination light socket and wire sub-assembly

  • Headlight light control ECU sub-assembly

  • Headlight housing sub-assembly (wire harness assembly)

  • Combination meter assembly
B1508 Short in Turn Signal / Hazard Flasher Circuit

Both conditions are met:


  • IG voltage is 10.5 V or higher.

  • Short in turn signal light circuit or hazard warning light circuit.

  • Harness or connector

  • Side turn signal light assembly

  • Outer rear view mirror assembly

  • Rear combination light socket and wire sub-assembly

  • Headlight light control ECU sub-assembly

  • Headlight housing sub-assembly (wire harness assembly)

  • Combination meter assembly

WIRING DIAGRAM

B006QSYE02
B006L0HE02
B006KS5E01

CAUTION / NOTICE / HINT

Note


  • When replacing the combination meter assembly, make sure to replace it with a new one.

  • Inspect the bulbs for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Combination Meter > Clear DTCs

    2. Recheck for DTCs and check that no DTCs are output.

      Click here


      Body Electrical > Combination Meter > Trouble Codes
      OK
      B1507 and B1508 are not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK LIGHTS


    1. Check the illumination of each turn signal light.

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

    B

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - COMBINATION METER ASSEMBLY) Click here

    C

    INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH Click here

    D

    INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH Click here

    E

    INSPECT LIGHTS Click here

    F

    INSPECT LIGHTS Click here

    A

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - COMBINATION METER ASSEMBLY)


    1. Disconnect the A28 headlight ECU sub-assembly LH connector.

    2. Disconnect the G17 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A28-11 (TNS) - G17-13 (LL) Always Below 1 Ω
      A28-12 (GND) - Body ground Always Below 1 Ω
      A28-11 (TNS) or G17-13 (LL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (POWER SOURCE)


    1. B006NCNC02
      *a

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly LH)

      Disconnect the A28 headlight ECU sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A28-11 (TNS) - Body ground Engine switch on (IG), LH turn signal switch off Below 1 Ω
      Engine switch on (IG), LH turn signal switch on Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  5. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH


    1. Remove the headlight ECU sub-assembly LH.

      Click here

    2. B006N0QC02
      *1 Headlight ECU sub-assembly LH

      Reconnect the A28 headlight ECU sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      B-20 - B-13 Engine switch on (IG), LH turn signal switch off Below 1 V
      Engine switch on (IG), LH turn signal switch on Below 1 V ←→ 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    OK

  6. CHECK WIRE HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT CLEARANCE LED UNIT LH)


    1. B006M5CC03
      *a

      Front view of wire harness connector

      (to headlight Clearance LED Unit LH)
      *b

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly LH)

      Remove the headlight ECU sub-assembly LH.

      Click here

    2. Remove the headlight clearance LED unit LH.


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-2 - B-20 Always Below 1 Ω
      A-2 or B-20 - Body ground Always 10 kΩ or higher
      A-1 - B-13 Always Below 1 Ω
      A-1 or B-13 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for ALPHARD) A
      OK (for VELLFIRE) B
      NG (for ALPHARD) C
      NG (for VELLFIRE) D

    A

    REPLACE HEADLIGHT CLEARANCE LED UNIT LH Click here

    B

    REPLACE HEADLIGHT CLEARANCE LED UNIT LH Click here

    C

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH Click here

    D

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH Click here

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - COMBINATION METER ASSEMBLY)


    1. Disconnect the A29 headlight ECU sub-assembly RH connector.

    2. Disconnect the G17 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A29-11 (TNS) - G17-7 (LR) Always Below 1 Ω
      A28-12 (GND) - Body ground Always Below 1 Ω
      A28-11 (TNS) or G17-7 (LR) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (POWER SOURCE)


    1. B006NCNC01
      *a

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly RH)

      Disconnect the A29 headlight ECU sub-assembly RH connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A29-11 (TNS) - Body ground Engine switch on (IG), RH turn signal switch off Below 1 Ω
      Engine switch on (IG), RH turn signal switch on Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

  9. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH


    1. Remove the headlight ECU sub-assembly RH.

      Click here

    2. B006N0QC03
      *1 Headlight ECU sub-assembly RH

      Reconnect the A29 headlight ECU sub-assembly RH connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D-20 - D-13 Engine switch on (IG), RH turn signal switch off Below 1 V
      Engine switch on (IG), RH turn signal switch on Below 1 V ←→ 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    OK

  10. CHECK WIRE HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - HEADLIGHT CLEARANCE LED UNIT RH)


    1. B006M5CC04
      *a

      Front view of wire harness connector

      (to headlight Clearance LED Unit RH)
      *b

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly RH)

      Remove the headlight ECU sub-assembly RH.

      Click here

    2. Remove the headlight clearance LED unit RH.


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C-2 - D-20 Always Below 1 Ω
      C-2 or D-20 - Body ground Always 10 kΩ or higher
      C-1 - D-13 Always Below 1 Ω
      C-1 or D-13 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for ALPHARD) A
      OK (for VELLFIRE) B
      NG (for ALPHARD) C
      NG (for VELLFIRE) D

    A

    REPLACE HEADLIGHT CLEARANCE LED UNIT RH Click here

    B

    REPLACE HEADLIGHT CLEARANCE LED UNIT RH Click here

    C

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH Click here

    D

    REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH Click here

  11. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH


    1. Remove the outer rear view mirror assembly LH.

      Click here

    2. Inspect the outer rear view mirror assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (OUTER REAR VIEW MIRROR ASSEMBLY LH - COMBINATION METER ASSEMBLY)

    NG

  12. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY LH


    1. Remove the side turn signal light assembly LH.

      Click here

    2. Inspect the side turn signal light assembly LH.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH Click here

    NG

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY LH Click here

  13. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH


    1. Remove the outer rear view mirror assembly RH.

      Click here

    2. Inspect the outer rear view mirror assembly RH.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

  14. INSPECT SIDE TURN SIGNAL LIGHT ASSEMBLY RH


    1. Remove the side turn signal light assembly RH.

      Click here

    2. Inspect the side turn signal light assembly RH.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH Click here

    NG

    REPLACE SIDE TURN SIGNAL LIGHT ASSEMBLY RH Click here

  15. INSPECT LIGHTS


    1. Inspect the illumination of each turn signal light.

      Result
      Result Proceed to
      All LH side rear turn signal lights do not blink. A
      Rear light assembly LH does not illuminate. B
      Rear combination light assembly LH does not illuminate. C

    B

    INSPECT REAR LIGHT ASSEMBLY LH Click here

    C

    INSPECT REAR COMBINATION LIGHT ASSEMBLY LH Click here

    A

  16. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY LH AND REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND)


    1. Disconnect the U21 and U23 rear light assembly LH connectors.

    2. Disconnect the K41 rear combination light assembly LH connector.

    3. Disconnect the G17 combination meter assembly connector.

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

      Standard Resistance
      Rear light assembly LH
      Tester Connection Condition Specified Condition
      U21-1 (B) - G17-5 (TRNL) Always Below 1 Ω
      U23-3 (E) - Body ground Always Below 1 Ω
      U21-1 (B) or G17-5 (TRNL) - Body ground Always 10 kΩ or higher
      Rear combination light assembly LH
      Tester Connection Condition Specified Condition
      K41-1 (TRN) - G17-5 (TRNL) Always Below 1 Ω
      K41-4 (E) - Body ground Always Below 1 Ω
      K41-1 (TRN) or G17-5 (TRNL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY LH AND REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND)


    1. Disconnect the U21 rear light assembly LH connector.

    2. Disconnect the K41 rear combination light assembly LH connector.

    3. Disconnect the G16 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K41-2 (TRN2) - U21-3 (TRN3) Always Below 1 Ω
      K41-2 (TRN2) or U21-3 (TRN3) - Body ground Always 10 kΩ or higher
      K41-3 (TRN1) - U21-2 (TRN4) Always Below 1 Ω
      K41-3 (TRN1) or U21-2 (TRN4) - Body ground Always 10 kΩ or higher
      U21-4 (TRN6) - G16-17 (SYC1) Always Below 1 Ω
      U21-4 (TRN6) or G16-17 (SYC1) - Body ground Always 10 kΩ or higher
      K41-8 (TRN5) - G16-17 (SYC1) Always Below 1 Ω
      K41-8 (TRN5) or G16-17 (SYC1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. INSPECT REAR LIGHT ASSEMBLY LH


    1. Remove the rear light assembly LH.


    2. Inspect the rear light assembly LH.


      Result
      Result Proceed to
      OK A
      NG (for ALPHARD) B
      NG (for VELLFIRE) C

    B

    REPLACE REAR LIGHT ASSEMBLY LH Click here

    C

    REPLACE REAR LIGHT ASSEMBLY LH Click here

    A

  19. INSPECT REAR COMBINATION LIGHT ASSEMBLY LH


    1. Remove the rear combination light assembly LH.


    2. Inspect the rear combination light assembly LH.


      Result
      Result Proceed to
      OK A
      NG (for ALPHARD) B
      NG (for VELLFIRE) C

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

    B

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

    C

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

  20. INSPECT REAR LIGHT ASSEMBLY LH


    1. Remove the rear light assembly LH.


    2. Inspect the rear light assembly LH.


      Result
      Result Proceed to
      OK A
      NG (for ALPHARD) B
      NG (for VELLFIRE) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY)

    B

    REPLACE REAR LIGHT ASSEMBLY LH Click here

    C

    REPLACE REAR LIGHT ASSEMBLY LH Click here

  21. INSPECT REAR COMBINATION LIGHT ASSEMBLY LH


    1. Remove the rear combination light assembly LH.


    2. Inspect the rear combination light assembly LH.


      Result
      Result Proceed to
      OK A
      NG (for ALPHARD) B
      NG (for VELLFIRE) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY LH - COMBINATION METER ASSEMBLY)

    B

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

    C

    REPLACE REAR COMBINATION LIGHT ASSEMBLY LH Click here

  22. INSPECT LIGHTS


    1. Inspect the illumination of each turn signal light.

      Result
      Result Proceed to
      All RH side rear turn signal lights do not blink. A
      Rear light assembly RH does not illuminate. B
      Rear combination light assembly RH does not illuminate. C

    B

    INSPECT REAR LIGHT ASSEMBLY RH Click here

    C

    INSPECT REAR COMBINATION LIGHT ASSEMBLY RH Click here

    A

  23. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY RH AND REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND)


    1. Disconnect the U20 and U22 rear light assembly RH connectors.

    2. Disconnect the L39 rear combination light assembly RH connector.

    3. Disconnect the G17 combination meter assembly connector.

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

      Standard Resistance
      Rear light assembly RH
      Tester Connection Condition Specified Condition
      U22-1 (B) - G17-11 (TRNR) Always Below 1 Ω
      U20-3 (E) - Body ground Always Below 1 Ω
      U22-1 (B) or G17-11 (TRNR) - Body ground Always 10 kΩ or higher
      Rear combination light assembly RH
      Tester Connection Condition Specified Condition
      L39-1 (TRN) - G17-11 (TRNR) Always Below 1 Ω
      L39-4 (E) - Body ground Always Below 1 Ω
      L39-1 (TRN) or G17-11 (TRNR) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  24. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY RH AND REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND)


    1. Disconnect the U22 rear light assembly RH connector.

    2. Disconnect the L39 rear combination light assembly RH connector.

    3. Disconnect the G16 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L39-2 (TRN2) - U22-3 (TRN3) Always Below 1 Ω
      L39-2 (TRN2) or U22-3 (TRN3) - Body ground Always 10 kΩ or higher
      L39-3 (TRN1) - U22-2 (TRN4) Always Below 1 Ω
      L39-3 (TRN1) or U22-2 (TRN4) - Body ground Always 10 kΩ or higher
      U22-4 (TRN6) - G16-17 (SYC1) Always Below 1 Ω
      U22-4 (TRN6) or G16-17 (SYC1) - Body ground Always 10 kΩ or higher
      L39-8 (TRN5) - G16-17 (SYC1) Always Below 1 Ω
      L39-8 (TRN5) or G16-17 (SYC1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  25. INSPECT REAR LIGHT ASSEMBLY RH


    1. Remove the rear light assembly RH.


    2. Inspect the rear light assembly RH.


      Result
      Result Proceed to
      OK A
      NG (for ALPHARD) B
      NG (for VELLFIRE) C

    B

    REPLACE REAR LIGHT ASSEMBLY RH Click here

    C

    REPLACE REAR LIGHT ASSEMBLY RH Click here

    A

  26. INSPECT REAR COMBINATION LIGHT ASSEMBLY RH


    1. Remove the rear combination light assembly RH.


    2. Inspect the rear combination light assembly RH.


      Result
      Result Proceed to
      OK A
      NG (for ALPHARD) B
      NG (for VELLFIRE) C

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

    B

    REPLACE REAR COMBINATION LAMP ASSEMBLY RH Click here

    C

    REPLACE REAR COMBINATION LAMP ASSEMBLY RH Click here

  27. INSPECT REAR LIGHT ASSEMBLY RH


    1. Remove the rear light assembly RH.


    2. Inspect the rear light assembly RH.


      Result
      Result Proceed to
      OK A
      NG (for ALPHARD) B
      NG (for VELLFIRE) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY)

    B

    REPLACE REAR LIGHT ASSEMBLY RH Click here

    C

    REPLACE REAR LIGHT ASSEMBLY RH Click here

  28. INSPECT REAR COMBINATION LIGHT ASSEMBLY RH


    1. Remove the rear combination light assembly RH.


    2. Inspect the rear combination light assembly RH.


      Result
      Result Proceed to
      OK A
      NG (for ALPHARD) B
      NG (for VELLFIRE) C

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY RH - COMBINATION METER ASSEMBLY)

    B

    REPLACE REAR COMBINATION LAMP ASSEMBLY RH Click here

    C

    REPLACE REAR COMBINATION LAMP ASSEMBLY RH Click here