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Home >> Lexus >> 2023 >> RX 350h Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System - Diagnostic Codes & Symptom Tests (1 Of 2) >> Meter / Gauge System >> DTC B1512-87: Lost Communication with Steering Switch Control Module Missing Message; DTC B1513-87: Lost Communication with Steering Switch Control Module (Multiplex Switch)Missing Message [10/2022 - ] >> Procedure

DTC B1512-87: Lost Communication with Steering Switch Control Module Missing Message; DTC B1513-87: Lost Communication with Steering Switch Control Module (Multiplex Switch)Missing Message [10/2022 - ]: Procedure

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

      Result

      Result Proceed to
      w/ Touch Tracer Operation A
      w/o Touch Tracer Operation B

    Result: 

    B 

    See step  28

    Result: 

    A 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      Only B1512-87 is output A
      Only B1513-87 is output B
      B1512-87 and B1513-87 are output C

    Result: 

    B 

    See step  13

    Result: 

    C 

    See step  21

    Result: 

    A 

    See step  3

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

      Result

      Result Proceed to
      except Gasoline Model A
      for Gasoline Model B

    Result: 

    B 

    See step  12

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 

    Pre-procedure1

    • Disconnect the C23 spiral cable sub-assembly connector.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C23-4 (BHT) - Body ground Ignition switch off 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C23-2 (EHT) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the C165 spiral cable sub-assembly connector.
    • Disconnect the C18 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C23-1 (LIN) - C165-10 (CXPI) Always Below 1 Ω Ω
      C23-1 (LIN) - C18-32 (CXPI) Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. INSPECT SPIRAL CABLE SUB-ASSEMBLY 

    Refer to INSPECTION [10/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    OK 

    See step  8

  8. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. CHECK FOR DTC 

    Pre-procedure1

    • Connect the spiral cable sub-assembly connectors.
    • Connect the C18 combination meter assembly connector.
    • Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1512-87 is output A
      B1512-87 is not output B

    Post-procedure1

    • None

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    A 

    See step  10

  10. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  11

  11. CHECK FOR DTC 

    Pre-procedure1

    • Disconnect the C23 and C165 spiral cable sub-assembly connectors.
    • Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      HINT: 

      When the combination meter assembly is operating normally and the C23 and C165 spiral cable sub-assembly connectors are disconnected, DTC B1512-87 or B1513-87 is stored.

      Result

      Result Proceed to
      B1512-87 and B1513-87 are output A
      Only B1512-87 is output B
      B1512-87 and B1513-87 are not output C

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE MULTIPLEX NETWORK STEERING ECU. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    C 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

  12. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 

    Pre-procedure1

    • Disconnect the C23 spiral cable sub-assembly connector.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C23-4 (BHT) - Body ground Always 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    See step  5

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 

    Pre-procedure1

    • Disconnect the C165 spiral cable sub-assembly connector.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C165-12 (+BA) - Body ground Ignition switch ON 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C165-4 (EAU) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the C23 spiral cable sub-assembly connector.
    • Disconnect the C18 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C165-10 (CXPI) - C23-1 (LIN) Always Below 1 Ω Ω
      C165-10 (CXPI) - C18-32 (CXPI) Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. INSPECT SPIRAL CABLE SUB-ASSEMBLY 

    Refer to INSPECTION [10/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    OK 

    See step  17

  17. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  18

  18. CHECK FOR DTC 

    Pre-procedure1

    • Connect the spiral cable sub-assembly connectors.
    • Connect the C18 combination meter assembly connector.
    • Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1513-87 is output A
      B1513-87 is not output B

    Post-procedure1

    • None

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    A 

    See step  19

  19. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  20

  20. CHECK FOR DTC 

    Pre-procedure1

    • Disconnect the C23 and C165 spiral cable sub-assembly connectors.
    • Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      HINT: 

      When the combination meter assembly is operating normally and the C23 and C165 spiral cable sub-assembly connectors are disconnected, DTC B1512-87 or B1513-87 is stored.

      Result

      Result Proceed to
      B1512-87 and B1513-87 are output A
      Only B1513-87 is output B
      B1512-87 and B1513-87 are not output C

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    C 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

  21. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the C23 and C165 spiral cable sub-assembly connectors.
    • Disconnect the C18 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C23-1 (LIN) - C18-32 (CXPI) Always Below 1 Ω Ω
      C165-10 (CXPI) - C18-32 (CXPI) Always Below 1 Ω Ω
      C23-1 (LIN), C165-10 (CXPI) or C18-32 (CXPI) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  22

  22. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  23

  23. CHECK FOR DTC 

    Pre-procedure1

    • Connect the C23 and C165 spiral cable sub-assembly connectors.
    • Connect the C18 combination meter assembly connector.
    • Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      B1512-87 and B1513-87 are output A
      B1512-87 and B1513-87 are not output B

    Post-procedure1

    • None

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    A 

    See step  24

  24. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  25

  25. CHECK FOR DTC 

    Pre-procedure1

    • Disconnect the C23 spiral cable sub-assembly connector.
    • Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      HINT: 

      • Even when the multiplex network steering ECU is operating normally and the C23 spiral cable sub-assembly connector is disconnected, as there are no changes in DTC output, DTC B1512-87 or B1513-87 remains stored.
      • If the multiplex network steering ECU is malfunctioning and the C23 spiral cable sub-assembly connector is disconnected, only DTC B1512-87 is stored.

      Result

      Result Proceed to
      B1512-87 and B1513-87 are output A
      Only B1512-87 is output B
      B1512-87 and B1513-87 are not output C

    Post-procedure1

    • None

    Result: 

    B 

    REPLACE MULTIPLEX NETWORK STEERING ECU. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    C 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    A 

    See step  26

  26. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  27

  27. CHECK FOR DTC 

    Pre-procedure1

    • Connect the C23 spiral cable sub-assembly connector.
    • Disconnect the C165 spiral cable sub-assembly connector.
    • Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      HINT: 

      • Even when the steering pad switch assembly is operating normally and the C165 spiral cable sub-assembly connector is disconnected, as there are no changes in DTC output, DTC B1512-87 or B1513-87 remains stored.
      • If the steering pad switch assembly is malfunctioning and the C165 spiral cable sub-assembly connector is disconnected, only DTC B1513-87 is stored.

      Result

      Result Proceed to
      B1512-87 and B1513-87 are output A
      Only B1512-87 is output B
      B1512-87 and B1513-87 are not output C

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

    Result: 

    B 

    REPLACE STEERING PAD SWITCH ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    C 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

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

      Result

      Result Proceed to
      except Gasoline Model A
      for Gasoline Model B

    Result: 

    B 

    See step  36

    Result: 

    A 

    See step  29

  29. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 

    Pre-procedure1

    • Disconnect the C23 spiral cable sub-assembly connector.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C23-4 (BHT) - Body ground Ignition switch off 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  30

  30. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C23-2 (EHT) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  31

  31. CHECK HARNESS AND CONNECTOR (SPIRAL CABLE SUB-ASSEMBLY - COMBINATION METER ASSEMBLY) 

    Pre-procedure1

    • Disconnect the C18 combination meter assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C23-1 (LIN) - C18-32 (CXPI) Always Below 1 Ω Ω
      C23-1 (LIN) or C18-32 (CXPI) - Body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  32

  32. INSPECT SPIRAL CABLE SUB-ASSEMBLY 

    Refer to INSPECTION [10/2022 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    OK 

    See step  33

  33. REPLACE MULTIPLEX NETWORK STEERING ECU 
    1. Replace the multiplex network steering ECU with a new or known good one.

      HINT: 

      Refer to REMOVAL [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  34

  34. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  35

  35. CHECK FOR DTC 
    1. Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result  Proceed to
      B1512-87 is not output A
      B1512-87 is output B

    Result: 

    A 

    END (MULTIPLEX NETWORK STEERING ECU IS DEFECTIVE) 

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [10/2022 - 10/2024]  , or refer to  REMOVAL [10/2024 - ] 

  36. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 

    Pre-procedure1

    • Disconnect the C23 spiral cable sub-assembly connector.
    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      C23-4 (BHT) - Body ground Always 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    See step  30

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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