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Home >> Infiniti >> 2024 >> Q50 Sensory, AWD >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Control System (DTCS) (2 Of 2) >> DAST 2 (Steering Angle Sub Control Module) >> C13C2-00 FLEXRAY Communication >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK FLEXRAY COMMUNICATION CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Disconnect each control module harness connector.
    3. Check the continuity between each control module harness connector.
      Steering force control module Steering angle main control module Continuity
      Connector Terminal Connector Terminal
      M71 19 E26 19 Existed
      20 20
      Steering angle main control module Steering angle sub control module Continuity
      Connector Terminal Connector Terminal
      E26 19 E29 19 Existed
      20 20
      Steering force control module Steering angle sub control module Continuity
      Connector Terminal Connector Terminal
      M71 19 E29 19 Existed
      20 20
    4. Check the continuity between control module harness connector and ground.
      Steering force control module - Continuity
      Connector Terminal
      M71 19 Ground Not existed
      20
      Steering angle main control module - Continuity
      Connector Terminal
      E26 19 Ground Not existed
      20
      Steering angle sub control module - Continuity
      Connector Terminal
      E29 19 Ground Not existed
      20

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    Repair / replace harness or connector.

  2. CHECK STEERING FORCE CONTROL MODULE POWER SUPPLY CIRCUIT (1) 
    1. Turn the ignition switch OFF.
    2. Disconnect steering force control module harness connector.
    3. Check the voltage between steering force control module harness connector and ground.
      + - Voltage
      Steering force control module
      Connector Terminal
      M72 34 Ground 10.5 - 16.0 V

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    GO TO 3.

  3. CHECK STEERING FORCE CONTROL MODULE POWER SUPPLY CIRCUIT (2) 
    1. Check the 60A fusible link (#G). (With pre-crash seat belt system)
    2. Check the 60A fusible link (#I). (Without pre-crash seat belt system)
    3. Check the harness for open or short between steering force control module harness connector No. 34 terminal and the 60A fusible link (#G). (With pre-crash seat belt system)
    4. Check the harness for open or short between steering angle sub control module harness connector No. 34 terminal and the 60A fusible link (#I). (Without pre-crash seat belt system)

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for 12V battery power supply circuit.

    NO>>

    Repair / replace harness, connector, or fusible link.

  4. CHECK STEERING ANGLE MAIN CONTROL MODULE POWER SUPPLY CIRCUIT (1) 
    1. Disconnect steering angle main control module harness connector.
    2. Check the voltage between steering angle main control module harness connector and ground.
      + - Voltage
      Steering angle main control module
      Connector Terminal
      E27 34 Ground 10.5 - 16.0 V

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    GO TO 5.

  5. CHECK STEERING ANGLE MAIN CONTROL MODULE POWER SUPPLY CIRCUIT (2) 
    1. Check the 100A fusible link (#J).
    2. Check the harness for open or short between steering angle main control module harness connector No. 34 terminal and the 100A fusible link (#J).

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for 12V battery power supply circuit.

    NO>>

    Repair / replace harness, connector, or fusible link.

  6. CHECK STEERING ANGLE SUB CONTROL MODULE POWER SUPPLY CIRCUIT (1) 
    1. Disconnect steering angle sub control module harness connector.
    2. Check the voltage between steering angle sub control module harness connector and ground.
      + - Voltage
      Steering angle sub control module
      Connector Terminal
      E30 34 Ground 10.5 - 16.0 V

    Is the inspection result normal?

    YES>>

    GO TO 8.

    NO>>

    GO TO 7.

  7. CHECK STEERING ANGLE SUB CONTROL MODULE POWER SUPPLY CIRCUIT (2) 
    1. Check the 100A fusible link (#H). (With pre-crash seat belt system)
    2. Check the 100A fusible link (#K). (Without pre-crash seat belt system)
    3. Check the harness for open or short between steering angle sub control module harness connector No. 34 terminal and the 100A fusible link (#H). (With pre-crash seat belt system)
    4. Check the harness for open or short between steering angle sub control module harness connector No. 34 terminal and the 100A fusible link (#K). (Without pre-crash seat belt system)

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for 12V battery power supply circuit.

    NO>>

    Repair / replace harness, connector, or fusible link.

  8. CHECK IGNITION POWER SUPPLY CIRCUIT 

    Check ignition power supply circuit. Refer to Diagnosis Procedure . Is the inspection result normal?

    YES>>

    GO TO 9.

    NO>>

    Repair / replace harness, connector, terminal, fuse, or fusible link.

  9. CHECK INTERMITTENT INCIDENT 
    1. Turn the ignition switch OFF.
    2. Check enlarged contact spring of terminal. Refer to Inspection .
    3. Perform intermittent incident while turning steering wheel. Refer to Inspection .

    Is the inspection result normal?

    YES>>

    Replace steering angle main control module, steering angle sub control module and steering force control module.

    NO>>

    Repair / replace harness, connector, or terminal.

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