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Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Steering >> Steering Control Systems >> Steering Control System (DTCS) (1 Of 2) >> DAST 1 (Steering Angle Main Control Module) >> C13BC-00 Control Module IGN Power Sup >> DTC Diagnosis Procedure
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DTC Diagnosis Procedure

  1. CHECK IGNITION POWER SUPPLY FOR STEERING ANGLE MAIN CONTROL MODULE 
    1. Turn the ignition switch OFF.
    2. Disconnect steering angle main control module harness connector.
    3. Check the voltage between steering angle main control module harness connector and ground.
      + - Voltage
      Steering angle main control module
      Connector Terminal
      E26 25 Ground Approx. 0 V
    4. Turn the ignition switch ON.
    5. Check the voltage between steering angle main control module harness connector and ground.
      + - Voltage
      Steering angle main control module
      Connector Terminal
      E26 25 Ground 10.5 - 16.0 V

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    GO TO 3.

  2. CHECK INTERMITTENT INCIDENT FOR STEERING ANGLE MAIN CONTROL MODULE 
    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. Refer to STEERING ANGLE MAIN CONTROL MODULE : Removal and Installation .

    NO>>

    Repair / replace harness, connector, or terminal.

  3. CHECK IGNITION POWER SUPPLY CIRCUIT (1) 
    1. Turn the ignition switch OFF.
    2. Disconnect steering angle sub control module harness connector.
    3. Check the continuity between steering angle main control module harness connector and steering angle sub control module harness connector.
      Steering angle main control module Steering angle sub control module Continuity
      Connector Terminal Connector Terminal
      E26 25 E29 27 Existed

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    Repair / replace harness or connector.

  4. CHECK INTERNAL CIRCUIT IN STEERING ANGLE SUB CONTROL MODULE 

    Check the continuity between steering angle sub control module connector terminals.

    Steering angle sub control module Continuity
    Terminal
    25 27 Existed

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    Replace steering angle sub control module. Refer to STEERING ANGLE SUB CONTROL MODULE : Removal and Installation .

  5. CHECK IGNITION POWER SUPPLY FOR STEERING ANGLE SUB CONTROL MODULE 
    1. Check the voltage between steering angle sub control module harness connector and ground.
      + - Voltage
      Steering angle sub control module
      Connector Terminal
      E29 25 Ground Approx. 0 V
    2. Turn the ignition switch ON.
    3. Check the voltage between steering angle sub control module harness connector and ground.
      + - Voltage
      Steering angle sub control module
      Connector Terminal
      E29 25 Ground 10.5 - 16.0 V

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

    GO TO 7.

  6. CHECK INTERMITTENT INCIDENT FOR STEERING ANGLE SUB CONTROL MODULE 
    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 sub control module. Refer to STEERING ANGLE SUB CONTROL MODULE : Removal and Installation .

    NO>>

    Repair / replace harness, connector, or terminal.

  7. CHECK IGNITION POWER SUPPLY CIRCUIT (2) 
    1. Turn the ignition switch OFF.
    2. Disconnect steering force control module harness connector.
    3. Check the continuity between steering angle sub control module harness connector and steering force control module harness connector.
      Steering angle sub control module Steering force control module Continuity
      Connector Terminal Connector Terminal
      E29 25 M71 27 Existed

    Is the inspection result normal?

    YES>>

    GO TO 8.

    NO>>

    Repair / replace harness or connector.

  8. CHECK INTERNAL CIRCUIT IN STEERING FORCE CONTROL MODULE 

    Check the continuity between steering force control module connector terminals.

    Steering force control module Continuity
    Terminal
    25 27 Existed

    Is the inspection result normal?

    YES>>

    GO TO 9.

    NO>>

    Replace steering force control module. Refer to STEERING FORCE CONTROL MODULE : Removal and Installation .

  9. CHECK IGNITION POWER SUPPLY FOR STEERING FORCE CONTROL MODULE 
    1. Check the voltage between steering force control module harness connector and ground.
      + - Voltage
      Steering force control module
      Connector Terminal
      M71 25 Ground Approx. 0 V
    2. Turn the ignition switch ON.
    3. Check the voltage between force control module harness connector and ground.
      + - Voltage
      Steering force control module
      Connector Terminal
      M71 25 Ground 10.5 - 16.0 V

    Is the inspection result normal?

    YES>>

    GO TO 10.

    NO>>

    GO TO 11.

  10. CHECK INTERMITTENT INCIDENT FOR STEERING FORCE CONTROL MODULE 
    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 force control module. Refer to STEERING FORCE CONTROL MODULE : Removal and Installation .

    NO>>

    Repair / replace harness, connector, or terminal.

  11. CHECK IGNITION POWER SUPPLY CIRCUIT (3) 
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#12).
    3. Check the harness for open or short between steering force control module harness connector No. 25 terminal and the 10A fuse (#12).

    Is the inspection result normal?

    YES>>

    Perform the trouble diagnosis for ignition power supply circuit.

    NO>>

    Repair / replace harness, connector, or fuse.

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